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<h3 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h3><h4 id="YYModel-：一个非常轻量级的-JSON-模型自动转换库，代码风格良好且思路清晰，可以从源码中看到作者对-Runtime-深厚的理解。难能可贵的是-YYModel-在其轻量级的代码下还保留着自动类型转换，类型安全，无侵入等特性，并且具有接近手写解析代码的超高性能。"><a href="#YYModel-：一个非常轻量级的-JSON-模型自动转换库，代码风格良好且思路清晰，可以从源码中看到作者对-Runtime-深厚的理解。难能可贵的是-YYModel-在其轻量级的代码下还保留着自动类型转换，类型安全，无侵入等特性，并且具有接近手写解析代码的超高性能。" class="headerlink" title="YYModel ：一个非常轻量级的 JSON 模型自动转换库，代码风格良好且思路清晰，可以从源码中看到作者对 Runtime 深厚的理解。难能可贵的是 YYModel 在其轻量级的代码下还保留着自动类型转换，类型安全，无侵入等特性，并且具有接近手写解析代码的超高性能。"></a><a href="https://github.com/ibireme/YYModel" target="_blank" rel="noopener">YYModel</a> ：一个非常轻量级的 JSON 模型自动转换库，代码风格良好且思路清晰，可以从源码中看到作者对 Runtime 深厚的理解。难能可贵的是 YYModel 在其轻量级的代码下还保留着自动类型转换，类型安全，无侵入等特性，并且具有接近手写解析代码的超高性能。</h4><h3 id="一、先从objc4说起"><a href="#一、先从objc4说起" class="headerlink" title="一、先从objc4说起"></a>一、先从<a href="https://opensource.apple.com/tarballs/objc4/" target="_blank" rel="noopener">objc4</a>说起</h3><h4 id="Class"><a href="#Class" class="headerlink" title="Class"></a>Class</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">struct objc_class {</span><br><span class="line"> Class isa OBJC_ISA_AVAILABILITY;</span><br><span class="line"> Class super_class;</span><br><span class="line"> const char *name;</span><br><span class="line"> long version;</span><br><span class="line"> long info;</span><br><span class="line"> long instance_size;</span><br><span class="line"> struct objc_ivar_list *ivars;</span><br><span class="line"> struct objc_method_list **methodLists;</span><br><span class="line"> struct objc_cache *cache;</span><br><span class="line"> struct objc_protocol_list *protocols;</span><br><span class="line">};</span><br></pre></td></tr></table></figure>
<h5 id="Method（方法）、Ivar（成员变量）、Property（属性）"><a href="#Method（方法）、Ivar（成员变量）、Property（属性）" class="headerlink" title="Method（方法）、Ivar（成员变量）、Property（属性）"></a>Method（方法）、Ivar（成员变量）、Property（属性）</h5><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">typedef struct method_t *Method;</span><br><span class="line">typedef struct ivar_t *Ivar;</span><br><span class="line">typedef struct property_t *objc_property_t;</span><br></pre></td></tr></table></figure>
<h4 id="Method（方法）"><a href="#Method（方法）" class="headerlink" title="Method（方法）"></a>Method（方法）</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">struct objc_method {</span><br><span class="line"> SEL method_name;</span><br><span class="line"> char *method_types;</span><br><span class="line"> IMP method_imp;</span><br><span class="line">};</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">struct objc_method_list {</span><br><span class="line"> struct objc_method_list *obsolete;</span><br><span class="line"> int method_count;</span><br><span class="line"> int space;</span><br><span class="line"> struct objc_method method_list[1];</span><br><span class="line">};</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">struct objc_method_description {</span><br><span class="line"> SEL name; /**< The name of the method */</span><br><span class="line"> char *types; /**< The types of the method arguments */</span><br><span class="line">};</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">struct objc_method_description_list {</span><br><span class="line"> int count;</span><br><span class="line"> struct objc_method_description list[1];</span><br><span class="line">};</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line">//获取方法列表</span><br><span class="line">Method *class_copyMethodList(Class cls, unsigned int *outCount);</span><br><span class="line"></span><br><span class="line">//获取方法名</span><br><span class="line">SEL method_getName(Method m);</span><br><span class="line"></span><br><span class="line">//获取方法实现</span><br><span class="line">IMP method_getImplementation(Method m);</span><br><span class="line"></span><br><span class="line">//获取参数类型和返回类型</span><br><span class="line">const char *method_getTypeEncoding(Method m);</span><br></pre></td></tr></table></figure>
<h4 id="Ivar（成员变量）"><a href="#Ivar（成员变量）" class="headerlink" title="Ivar（成员变量）"></a>Ivar（成员变量）</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">struct objc_ivar_list {</span><br><span class="line"> int ivar_count;</span><br><span class="line"> int space;</span><br><span class="line"> struct objc_ivar ivar_list[1];</span><br><span class="line">};</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">struct objc_ivar {</span><br><span class="line"> char *ivar_name;</span><br><span class="line"> char *ivar_type;</span><br><span class="line"> int ivar_offset;</span><br><span class="line"> int space;</span><br><span class="line">};</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">//基地址偏移字节, 对象地址 ＋ ivar偏移字节 -> 访问ivar</span><br><span class="line">ptrdiff_t ivar_getOffset(Ivar ivar);</span><br><span class="line"></span><br><span class="line">//成员变量名</span><br><span class="line">const char *ivar_getName(Ivar ivar);</span><br><span class="line"></span><br><span class="line">//成员变量类型</span><br><span class="line">const char *ivar_getTypeEncoding(Ivar ivar);</span><br></pre></td></tr></table></figure>
<h4 id="Property（属性）"><a href="#Property（属性）" class="headerlink" title="Property（属性）"></a>Property（属性）</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">struct property_t {</span><br><span class="line"> const char *name;</span><br><span class="line"> const char *attributes;</span><br><span class="line">};</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">typedef struct {</span><br><span class="line"> const char *name; /**< The name of the attribute */</span><br><span class="line"> const char *value; /**< The value of the attribute (usually empty) */</span><br><span class="line">} objc_property_attribute_t;</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">//获取Class的属性列表</span><br><span class="line">objc_property_t *class_copyPropertyList(Class cls, unsigned int *outCount);</span><br><span class="line"></span><br><span class="line">//获取单个属性名称</span><br><span class="line">const char *property_getName(objc_property_t prop);</span><br><span class="line"></span><br><span class="line">//获取单个属性详细</span><br><span class="line">const char *property_getAttributes(objc_property_t prop);</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">//复制单个属性的详细：</span><br><span class="line">objc_property_attribute_t *property_copyAttributeList(objc_property_t prop, </span><br><span class="line"> unsigned int *outCount);</span><br></pre></td></tr></table></figure>
<h5 id="举个例子："><a href="#举个例子：" class="headerlink" title="举个例子："></a>举个例子：</h5><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">@property (nonatomic, copy, getter=getName, setter=setName:) NSString *name;</span><br></pre></td></tr></table></figure>
<h5 id="获取name的Attributes-lt-name-value-gt"><a href="#获取name的Attributes-lt-name-value-gt" class="headerlink" title="获取name的Attributes<name,value>:"></a>获取name的Attributes<name,value>:</h5><table>
<thead>
<tr>
<th style="text-align:center">index</th>
<th style="text-align:center">name</th>
<th style="text-align:center">value</th>
<th style="text-align:center">描述</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:center">0</td>
<td style="text-align:center">T</td>
<td style="text-align:center">@\”NSString\”</td>
<td style="text-align:center">类型</td>
</tr>
<tr>
<td style="text-align:center">1</td>
<td style="text-align:center">C</td>
<td style="text-align:center">-</td>
<td style="text-align:center">copy</td>
</tr>
<tr>
<td style="text-align:center">2</td>
<td style="text-align:center">N</td>
<td style="text-align:center">-</td>
<td style="text-align:center">nonatomic</td>
</tr>
<tr>
<td style="text-align:center">3</td>
<td style="text-align:center">G</td>
<td style="text-align:center">getName</td>
<td style="text-align:center">getter</td>
</tr>
<tr>
<td style="text-align:center">4</td>
<td style="text-align:center">S</td>
<td style="text-align:center">setName:</td>
<td style="text-align:center">setter</td>
</tr>
<tr>
<td style="text-align:center">5</td>
<td style="text-align:center">V</td>
<td style="text-align:center">_name</td>
<td style="text-align:center">ivarName</td>
</tr>
</tbody>
</table>
<h4 id="还有很多其他苹果规定的type，具体可查看以下链接："><a href="#还有很多其他苹果规定的type，具体可查看以下链接：" class="headerlink" title="还有很多其他苹果规定的type，具体可查看以下链接："></a>还有很多其他苹果规定的type，具体可查看以下链接：</h4><h6 id="Type-Encodings"><a href="#Type-Encodings" class="headerlink" title="Type Encodings"></a><a href="https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtTypeEncodings.html" target="_blank" rel="noopener">Type Encodings</a></h6><h6 id="Declared-Properties"><a href="#Declared-Properties" class="headerlink" title="Declared Properties"></a><a href="https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtPropertyIntrospection.html#//apple_ref/doc/uid/TP40008048-CH101-SW5" target="_blank" rel="noopener">Declared Properties</a></h6><h4 id="Others"><a href="#Others" class="headerlink" title="Others"></a>Others</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">struct objc_category {</span><br><span class="line"> char *category_name;</span><br><span class="line"> char *class_name;</span><br><span class="line"> struct objc_method_list *instance_methods;</span><br><span class="line"> struct objc_method_list *class_methods;</span><br><span class="line"> struct objc_protocol_list *protocols;</span><br><span class="line">};</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">struct objc_protocol_list {</span><br><span class="line"> struct objc_protocol_list *next;</span><br><span class="line"> long count;</span><br><span class="line"> __unsafe_unretained Protocol *list[1];</span><br><span class="line">};</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">struct objc_cache {</span><br><span class="line"> unsigned int mask /* total = mask + 1 */;</span><br><span class="line"> unsigned int occupied;</span><br><span class="line"> Method buckets[1];</span><br><span class="line">};</span><br></pre></td></tr></table></figure>
<p>–</p>
<h3 id="二、YYModel文件目录"><a href="#二、YYModel文件目录" class="headerlink" title="二、YYModel文件目录"></a>二、YYModel文件目录</h3><h4 id="3个文件："><a href="#3个文件：" class="headerlink" title="3个文件："></a>3个文件：</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">YYModel.h</span><br><span class="line"></span><br><span class="line">YYClassInfo.h</span><br><span class="line">YYClassInfo.m</span><br><span class="line"></span><br><span class="line">NSObject+YYModel.h</span><br><span class="line">NSObject+YYModel.m</span><br></pre></td></tr></table></figure>
<h4 id="YYModel-h"><a href="#YYModel-h" class="headerlink" title="YYModel.h"></a>YYModel.h</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line">YYModel.h</span><br><span class="line"></span><br><span class="line">#import <Foundation/Foundation.h></span><br><span class="line"></span><br><span class="line">#if __has_include(<YYModel/YYModel.h>)</span><br><span class="line">FOUNDATION_EXPORT double YYModelVersionNumber;</span><br><span class="line">FOUNDATION_EXPORT const unsigned char YYModelVersionString[];</span><br><span class="line">#import <YYModel/NSObject+YYModel.h></span><br><span class="line">#import <YYModel/YYClassInfo.h></span><br><span class="line">#else</span><br><span class="line">#import "NSObject+YYModel.h"</span><br><span class="line">#import "YYClassInfo.h"</span><br><span class="line">#endif</span><br></pre></td></tr></table></figure>
<h4 id="YYClassInfo："><a href="#YYClassInfo：" class="headerlink" title="YYClassInfo："></a>YYClassInfo：</h4><h5 id="管理-4个类，分别是对class、ivar、method、property的封装"><a href="#管理-4个类，分别是对class、ivar、method、property的封装" class="headerlink" title="管理 4个类，分别是对class、ivar、method、property的封装"></a>管理 4个类，分别是对class、ivar、method、property的封装</h5><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">YYClassInfo.h</span><br><span class="line"></span><br><span class="line">@interface YYClassInfo : NSObject</span><br><span class="line">@interface YYClassIvarInfo : NSObject</span><br><span class="line">@interface YYClassMethodInfo : NSObject</span><br><span class="line">@interface YYClassPropertyInfo : NSObject</span><br></pre></td></tr></table></figure>
<h5 id="将-Runtime-层级的一些结构体封装到-NSObject-层级以便调用；"><a href="#将-Runtime-层级的一些结构体封装到-NSObject-层级以便调用；" class="headerlink" title="将 Runtime 层级的一些结构体封装到 NSObject 层级以便调用；"></a>将 Runtime 层级的一些结构体封装到 NSObject 层级以便调用；</h5><table>
<thead>
<tr>
<th style="text-align:left">YYClassInfo（NSObject层级）</th>
<th style="text-align:left">Runtime层级</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">YYClassInfo</td>
<td style="text-align:left">objc_class</td>
</tr>
<tr>
<td style="text-align:left">YYClassIvarInfo</td>
<td style="text-align:left">objc_ivar</td>
</tr>
<tr>
<td style="text-align:left">YYClassMethodInfo</td>
<td style="text-align:left">objc_method</td>
</tr>
<tr>
<td style="text-align:left">YYClassPropertyInfo</td>
<td style="text-align:left">property_t</td>
</tr>
</tbody>
</table>
<h4 id="NSObject-YYModel："><a href="#NSObject-YYModel：" class="headerlink" title="NSObject+YYModel："></a>NSObject+YYModel：</h4><h6 id="主要负责提供方便调用的接口、实现具体的模型转换逻辑（借助YYClassInfo-中的封装）"><a href="#主要负责提供方便调用的接口、实现具体的模型转换逻辑（借助YYClassInfo-中的封装）" class="headerlink" title="主要负责提供方便调用的接口、实现具体的模型转换逻辑（借助YYClassInfo 中的封装）"></a>主要负责提供方便调用的接口、实现具体的模型转换逻辑（借助YYClassInfo 中的封装）</h6><ul>
<li>2个私有类（_YYModelMeta、_YYModelPropertyMeta）</li>
<li>1个主类（NSObject (YYModel)）</li>
<li>1个协议（@protocol YYModel <nsobject>）</nsobject></li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">NSObject+YYModel.h</span><br><span class="line"></span><br><span class="line">@interface _YYModelMeta : NSObject</span><br><span class="line">@interface _YYModelPropertyMeta : NSObject</span><br><span class="line">@interface NSObject (YYModel)</span><br><span class="line">@protocol YYModel <NSObject></span><br></pre></td></tr></table></figure>
<ul>
<li>_YYModelMeta ：表示Model的类信息，包含YYClassInfo；</li>
<li>_YYModelPropertyMeta ：表示Model对象的属性信息，包含YYClassPropertyInfo；</li>
</ul>
<h6 id="以下三者关系："><a href="#以下三者关系：" class="headerlink" title="以下三者关系："></a>以下三者关系：</h6><ul>
<li>_YYModelMeta、_YYModelPropertyMeta</li>
<li>YYClassInfo（NSObject层级）</li>
<li>Runtime层级</li>
</ul>
<table>
<thead>
<tr>
<th style="text-align:center">NSObject+YYModel（逻辑实现层）</th>
<th style="text-align:left">YYClassInfo（NSObject层级）</th>
<th style="text-align:left">Runtime层级</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:center">_YYModelMeta</td>
<td style="text-align:left">YYClassInfo</td>
<td style="text-align:left">objc_class</td>
</tr>
<tr>
<td style="text-align:center">-</td>
<td style="text-align:left">YYClassIvarInfo</td>
<td style="text-align:left">objc_ivar</td>
</tr>
<tr>
<td style="text-align:center">-</td>
<td style="text-align:left">YYClassMethodInfo</td>
<td style="text-align:left">objc_method</td>
</tr>
<tr>
<td style="text-align:center">_YYModelPropertyMeta</td>
<td style="text-align:left">YYClassPropertyInfo</td>
<td style="text-align:left">property_t</td>
</tr>
</tbody>
</table>
<h3 id="三、模型转换逻辑实现"><a href="#三、模型转换逻辑实现" class="headerlink" title="三、模型转换逻辑实现"></a>三、模型转换逻辑实现</h3><h4 id="1-JSON转Model分三个步骤："><a href="#1-JSON转Model分三个步骤：" class="headerlink" title="1.JSON转Model分三个步骤："></a>1.JSON转Model分三个步骤：</h4><ul>
<li><strong>JSON - to - Data</strong></li>
<li><strong>Data - to - Dictionary</strong></li>
<li><strong>Dictionary - to - Model</strong></li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">//JSON —> Data</span><br><span class="line">NSData *jsonData = [(NSString *)json dataUsingEncoding : NSUTF8StringEncoding];</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">//Data —> Dictionary</span><br><span class="line">NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:jsonData options:kNilOptions error:NULL];</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">//dictionary —> Model (一个方法就实现了！)</span><br><span class="line"></span><br><span class="line">[self modelSetWithDictionary:dictionary]</span><br></pre></td></tr></table></figure>
<h4 id="2-具体分析-dictionary-转换-Model"><a href="#2-具体分析-dictionary-转换-Model" class="headerlink" title="2.具体分析 dictionary 转换 Model"></a>2.具体分析 dictionary 转换 Model</h4><h6 id="主要实现方法："><a href="#主要实现方法：" class="headerlink" title="主要实现方法："></a>主要实现方法：</h6><h5 id="BOOL-modelSetWithDictionary-NSDictionary-dic"><a href="#BOOL-modelSetWithDictionary-NSDictionary-dic" class="headerlink" title="- (BOOL)modelSetWithDictionary:(NSDictionary *)dic;"></a>- (BOOL)modelSetWithDictionary:(NSDictionary *)dic;</h5><h6 id="看这个方法之前，先看看-YYModelMeta、-YYModelPropertyMeta的包："><a href="#看这个方法之前，先看看-YYModelMeta、-YYModelPropertyMeta的包：" class="headerlink" title="看这个方法之前，先看看_YYModelMeta、_YYModelPropertyMeta的包："></a>看这个方法之前，先看看_YYModelMeta、_YYModelPropertyMeta的包：</h6><h5 id="YYModelMeta："><a href="#YYModelMeta：" class="headerlink" title="_YYModelMeta："></a>_YYModelMeta：</h5><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br></pre></td><td class="code"><pre><span class="line">@interface _YYModelMeta : NSObject {</span><br><span class="line"> ///用于框架类的实例变量，@private太限制，@protected或@public又太开放，就使用这个package吧</span><br><span class="line"> @package</span><br><span class="line"> </span><br><span class="line"> ///class信息</span><br><span class="line"> YYClassInfo *_classInfo;</span><br><span class="line"> </span><br><span class="line"> /// Key:key 和 keyPath, Value:_YYModelPropertyMeta.</span><br><span class="line"> NSDictionary *_mapper;</span><br><span class="line"> </span><br><span class="line"> /// Array<_YYModelPropertyMeta></span><br><span class="line"> NSArray *_allPropertyMetas;</span><br><span class="line"> </span><br><span class="line"> /// Array<_YYModelPropertyMeta> path.</span><br><span class="line"> NSArray *_keyPathPropertyMetas;</span><br><span class="line"> </span><br><span class="line"> /// Array<_YYModelPropertyMeta> meta 对应多个 key</span><br><span class="line"> NSArray *_multiKeysPropertyMetas;</span><br><span class="line"> </span><br><span class="line"> /// key 和 keyPath 个数</span><br><span class="line"> NSUInteger _keyMappedCount;</span><br><span class="line"> </span><br><span class="line"> /// Model class type.</span><br><span class="line"> YYEncodingNSType _nsType;</span><br><span class="line"> </span><br><span class="line"> /// 用户响应了 "new字典去替换origin字典" 协议方法；json-to-model将要转换；</span><br><span class="line"> BOOL _hasCustomWillTransformFromDictionary;</span><br><span class="line"> </span><br><span class="line"> /// 用户响应了 "new字典去替换origin字典" 协议方法；json-to-model已转换；</span><br><span class="line"> BOOL _hasCustomTransformFromDictionary;</span><br><span class="line"> </span><br><span class="line"> /// model-to-json额外协议方法:-modelCustomTransformToDictionary:</span><br><span class="line"> BOOL _hasCustomTransformToDictionary;</span><br><span class="line"> </span><br><span class="line"> /// json-to-model额外协议方法:+modelCustomClassForDictionary:</span><br><span class="line"> BOOL _hasCustomClassFromDictionary;</span><br><span class="line">}</span><br><span class="line">@end</span><br></pre></td></tr></table></figure>
<h5 id="YYModelPropertyMeta"><a href="#YYModelPropertyMeta" class="headerlink" title="_YYModelPropertyMeta"></a>_YYModelPropertyMeta</h5><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br></pre></td><td class="code"><pre><span class="line">@interface _YYModelPropertyMeta : NSObject {</span><br><span class="line"> @package</span><br><span class="line"> </span><br><span class="line"> ///< 属性名</span><br><span class="line"> NSString *_name; </span><br><span class="line"> </span><br><span class="line"> ///< 属性type，包含三种类型：</span><br><span class="line"> // value（值类型void、UInt8、Block、CArray等）、 // qualifier（限定词，Const、Byref、Oneway等）、</span><br><span class="line"> // property（Readonly、Copy、Setter、Dynamic等）、 </span><br><span class="line"> YYEncodingType _type; </span><br><span class="line"> </span><br><span class="line"> ///< 属性Foundation type，比如NSMutableString、NSNumber等 </span><br><span class="line"> YYEncodingNSType _nsType; </span><br><span class="line"> </span><br><span class="line"> ///< 是否C Number类型 </span><br><span class="line"> BOOL _isCNumber; </span><br><span class="line"> </span><br><span class="line"> ///< 属性对应的Class </span><br><span class="line"> Class _cls; </span><br><span class="line"> </span><br><span class="line"> ///< 数组对应的泛型Class </span><br><span class="line"> Class _genericCls; </span><br><span class="line"> </span><br><span class="line"> SEL _getter; </span><br><span class="line"> SEL _setter;</span><br><span class="line"> </span><br><span class="line"> ///< 是否兼容KVC</span><br><span class="line"> BOOL _isKVCCompatible; </span><br><span class="line"> </span><br><span class="line"> ///< 结构体是否可以根据key来归解档 </span><br><span class="line"> BOOL _isStructAvailableForKeyedArchiver; </span><br><span class="line"> </span><br><span class="line"> ///< class/generic class implements +modelCustomClassForDictionary:</span><br><span class="line"> BOOL _hasCustomClassFromDictionary; </span><br><span class="line"> </span><br><span class="line"> /*</span><br><span class="line"> property->key: _mappedToKey:key _mappedToKeyPath:nil _mappedToKeyArray:nil</span><br><span class="line"> property->keyPath: _mappedToKey:keyPath _mappedToKeyPath:keyPath(array) _mappedToKeyArray:nil</span><br><span class="line"> property->keys: _mappedToKey:keys[0] _mappedToKeyPath:nil/keyPath _mappedToKeyArray:keys(array)</span><br><span class="line"> */</span><br><span class="line"> NSString *_mappedToKey; ///< the key mapped to</span><br><span class="line"> NSArray *_mappedToKeyPath; ///< the key path mapped to (nil if the name is not key path) </span><br><span class="line"> NSArray *_mappedToKeyArray; ///< the key(NSString) or keyPath(NSArray) array (nil if not mapped to multiple keys)</span><br><span class="line"> YYClassPropertyInfo *_info; ///< 属性信息</span><br><span class="line"> _YYModelPropertyMeta *_next; ///< 如果一个key对应多个属性的话，next</span><br><span class="line">}</span><br><span class="line">@end</span><br></pre></td></tr></table></figure>
<h5 id="再看两个函数：CFArrayApplyFunction-和-CFDictionaryApplyFunction"><a href="#再看两个函数：CFArrayApplyFunction-和-CFDictionaryApplyFunction" class="headerlink" title="再看两个函数：CFArrayApplyFunction() 和 CFDictionaryApplyFunction()"></a>再看两个函数：CFArrayApplyFunction() 和 CFDictionaryApplyFunction()</h5><h6 id="CF-CoreFoundation-相对NS-Foundation-遍历容器能提升性能"><a href="#CF-CoreFoundation-相对NS-Foundation-遍历容器能提升性能" class="headerlink" title="CF(CoreFoundation)相对NS(Foundation)遍历容器能提升性能"></a>CF(CoreFoundation)相对NS(Foundation)遍历容器能提升性能</h6><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">//遍历字典，将参数context传给applier；需要重写applier方法，接收context；</span><br><span class="line">void CFDictionaryApplyFunction(CFDictionaryRef theDict, CFDictionaryApplierFunction CF_NOESCAPE applier, void *context);</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">//遍历数组，将参数context传给applier；需要重写applier方法，接收context；</span><br><span class="line">void CFArrayApplyFunction(CFArrayRef theArray, CFRange range, CFArrayApplierFunction CF_NOESCAPE applier, void *context);</span><br></pre></td></tr></table></figure>
<h5 id="主要实现方法：-1"><a href="#主要实现方法：-1" class="headerlink" title="主要实现方法："></a>主要实现方法：</h5><h5 id="BOOL-modelSetWithDictionary-NSDictionary-dic-1"><a href="#BOOL-modelSetWithDictionary-NSDictionary-dic-1" class="headerlink" title="- (BOOL)modelSetWithDictionary:(NSDictionary *)dic;"></a>- (BOOL)modelSetWithDictionary:(NSDictionary *)dic;</h5><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br></pre></td><td class="code"><pre><span class="line">//dictionary 转换 Model主要实现方法</span><br><span class="line">- (BOOL)modelSetWithDictionary:(NSDictionary *)dic {</span><br><span class="line"></span><br><span class="line"> //1.kCFNull是NSNull的单例,表示空值@{}</span><br><span class="line"> if (!dic || dic == (id)kCFNull) return NO;</span><br><span class="line"> if (![dic isKindOfClass:[NSDictionary class]]) return NO;</span><br><span class="line"> </span><br><span class="line"> //2.创建_YYModelMeta对象，封装并获取class信息(获取class的ivar、method、property等)</span><br><span class="line"> _YYModelMeta *modelMeta = [_YYModelMeta metaWithClass:object_getClass(self)];</span><br><span class="line"> if (modelMeta->_keyMappedCount == 0) return NO;//属性个数为0</span><br><span class="line"> </span><br><span class="line"> //这是YYModel协议中的内容，算是附加功能暂时先忽略</span><br><span class="line"> if (modelMeta->_hasCustomWillTransformFromDictionary) {//json-to-model转换之前</span><br><span class="line"> dic = [((id<YYModel>)self) modelCustomWillTransformFromDictionary:dic];</span><br><span class="line"> if (![dic isKindOfClass:[NSDictionary class]]) return NO;</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> //3.创建结构体（class信息、model对象、dic）</span><br><span class="line"> ModelSetContext context = {0};</span><br><span class="line"> context.modelMeta = (__bridge void *)(modelMeta);</span><br><span class="line"> context.model = (__bridge void *)(self);</span><br><span class="line"> context.dictionary = (__bridge void *)(dic);</span><br><span class="line"> </span><br><span class="line"> //4.判断属性个数和字典数量关系</span><br><span class="line"> //通常情况是两者相等</span><br><span class="line"> //存在3种类型的key（keyPath、keys、key），分别处理</span><br><span class="line"> if (modelMeta->_keyMappedCount >= CFDictionaryGetCount((CFDictionaryRef)dic)) {</span><br><span class="line"> </span><br><span class="line"> //字典</span><br><span class="line"> CFDictionaryApplyFunction((CFDictionaryRef)dic, ModelSetWithDictionaryFunction, &context);</span><br><span class="line"> </span><br><span class="line"> // 是否存在映射keyPath属性元</span><br><span class="line"> if (modelMeta->_keyPathPropertyMetas) {</span><br><span class="line"> //数组（keyPath）</span><br><span class="line"> CFArrayApplyFunction((CFArrayRef)modelMeta->_keyPathPropertyMetas,</span><br><span class="line"> CFRangeMake(0, CFArrayGetCount((CFArrayRef)modelMeta->_keyPathPropertyMetas)),</span><br><span class="line"> ModelSetWithPropertyMetaArrayFunction,</span><br><span class="line"> &context);</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> //是否存在一个key映射多个属性元</span><br><span class="line"> if (modelMeta->_multiKeysPropertyMetas) {</span><br><span class="line"> </span><br><span class="line"> //数组（keys）</span><br><span class="line"> CFArrayApplyFunction((CFArrayRef)modelMeta->_multiKeysPropertyMetas,</span><br><span class="line"> CFRangeMake(0, CFArrayGetCount((CFArrayRef)modelMeta->_multiKeysPropertyMetas)),</span><br><span class="line"> ModelSetWithPropertyMetaArrayFunction,</span><br><span class="line"> &context);</span><br><span class="line"> }</span><br><span class="line"> } else {</span><br><span class="line"> </span><br><span class="line"> //数组（key）</span><br><span class="line"> CFArrayApplyFunction((CFArrayRef)modelMeta->_allPropertyMetas,</span><br><span class="line"> CFRangeMake(0, modelMeta->_keyMappedCount),</span><br><span class="line"> ModelSetWithPropertyMetaArrayFunction,</span><br><span class="line"> &context);</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> // 忽略</span><br><span class="line"> if (modelMeta->_hasCustomTransformFromDictionary) {</span><br><span class="line"> return [((id<YYModel>)self) modelCustomTransformFromDictionary:dic];</span><br><span class="line"> }</span><br><span class="line"> return YES;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h4 id="上述方法主要干了这么几件事："><a href="#上述方法主要干了这么几件事：" class="headerlink" title="上述方法主要干了这么几件事："></a>上述方法主要干了这么几件事：</h4><ul>
<li>验证参数（为了程序健壮性一定要这么做）</li>
<li>创建YYModelMeta对象</li>
<li>创建ModelSetContext结构体</li>
<li>将字典用ModelSetWithDictionaryFunction解析（遍历字典去setModel）</li>
<li>根据字典中存在keyPath、keys、key对应的value是数组的情况，都调用ModelSetWithPropertyMetaArrayFunction解析（遍历数组去setModel）</li>
</ul>
<h5 id="遍历数组"><a href="#遍历数组" class="headerlink" title="遍历数组"></a>遍历数组</h5><h6 id="ModelSetWithPropertyMetaArrayFunction"><a href="#ModelSetWithPropertyMetaArrayFunction" class="headerlink" title="ModelSetWithPropertyMetaArrayFunction"></a>ModelSetWithPropertyMetaArrayFunction</h6><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">static void ModelSetWithPropertyMetaArrayFunction(const void *_propertyMeta, void *_context) {</span><br><span class="line"> ModelSetContext *context = _context;</span><br><span class="line"> __unsafe_unretained NSDictionary *dictionary = (__bridge NSDictionary *)(context->dictionary);</span><br><span class="line"> __unsafe_unretained _YYModelPropertyMeta *propertyMeta = (__bridge _YYModelPropertyMeta *)(_propertyMeta);</span><br><span class="line"> if (!propertyMeta->_setter) return;</span><br><span class="line"> id value = nil;</span><br><span class="line"> </span><br><span class="line"> if (propertyMeta->_mappedToKeyArray) {</span><br><span class="line"> value = YYValueForMultiKeys(dictionary, propertyMeta->_mappedToKeyArray);</span><br><span class="line"> } else if (propertyMeta->_mappedToKeyPath) {</span><br><span class="line"> value = YYValueForKeyPath(dictionary, propertyMeta->_mappedToKeyPath);</span><br><span class="line"> } else {</span><br><span class="line"> value = [dictionary objectForKey:propertyMeta->_mappedToKey];</span><br><span class="line"> }</span><br><span class="line"> //必须有value才实现value转property</span><br><span class="line"> if (value) {</span><br><span class="line"> __unsafe_unretained id model = (__bridge id)(context->model);</span><br><span class="line"> //最终每个属性对应的解析方法</span><br><span class="line"> ModelSetValueForProperty(model, value, propertyMeta);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h5 id="遍历字典"><a href="#遍历字典" class="headerlink" title="遍历字典"></a>遍历字典</h5><h6 id="ModelSetWithDictionaryFunction"><a href="#ModelSetWithDictionaryFunction" class="headerlink" title="ModelSetWithDictionaryFunction"></a>ModelSetWithDictionaryFunction</h6><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">static void ModelSetWithDictionaryFunction(const void *_key, const void *_value, void *_context) {</span><br><span class="line"> ModelSetContext *context = _context;</span><br><span class="line"> __unsafe_unretained _YYModelMeta *meta = (__bridge _YYModelMeta *)(context->modelMeta);</span><br><span class="line"> __unsafe_unretained _YYModelPropertyMeta *propertyMeta = [meta->_mapper objectForKey:(__bridge id)(_key)];</span><br><span class="line"> __unsafe_unretained id model = (__bridge id)(context->model);</span><br><span class="line"> while (propertyMeta) {</span><br><span class="line"> </span><br><span class="line"> //必须有setter方法才实现value转property</span><br><span class="line"> if (propertyMeta->_setter) {</span><br><span class="line"> </span><br><span class="line"> //最终每个属性对应的解析方法</span><br><span class="line"> ModelSetValueForProperty(model, (__bridge __unsafe_unretained id)_value, propertyMeta);</span><br><span class="line"> }</span><br><span class="line"> propertyMeta = propertyMeta->_next;</span><br><span class="line"> };</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h5 id="最终的解析方法：遍历字典或数组中每一项属性"><a href="#最终的解析方法：遍历字典或数组中每一项属性" class="headerlink" title="最终的解析方法：遍历字典或数组中每一项属性"></a>最终的解析方法：遍历字典或数组中每一项属性</h5><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">static void ModelSetValueForProperty(__unsafe_unretained id model,</span><br><span class="line"> __unsafe_unretained id value,</span><br><span class="line"> __unsafe_unretained _YYModelPropertyMeta *meta) {</span><br></pre></td></tr></table></figure>
<h6 id="为了看清实现逻辑，精简代码如下："><a href="#为了看清实现逻辑，精简代码如下：" class="headerlink" title="为了看清实现逻辑，精简代码如下："></a>为了看清实现逻辑，精简代码如下：</h6><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">static void ModelSetValueForProperty(__unsafe_unretained id model,</span><br><span class="line"> __unsafe_unretained id value,</span><br><span class="line"> __unsafe_unretained _YYModelPropertyMeta *meta) {</span><br><span class="line"> if (meta->_isCNumber) {//是否C Number 类型</span><br><span class="line"> NSNumber *num = YYNSNumberCreateFromID(value);//将id类型转换成NSNumber类型</span><br><span class="line"> ModelSetNumberToProperty(model, num, meta);//值类型</span><br><span class="line"> if (num != nil) [num class]; // hold the number</span><br><span class="line"> } else if (meta->_nsType) {</span><br><span class="line"> if (value == (id)kCFNull) {</span><br><span class="line"> ((void (*)(id, SEL, id))(void *) objc_msgSend)((id)model, meta->_setter, (id)nil);</span><br><span class="line"> } else {</span><br><span class="line"> switch (meta->_nsType) {</span><br><span class="line"> case YYEncodingTypeNSString:</span><br><span class="line"> case YYEncodingTypeNSMutableString: {</span><br><span class="line"> } break;</span><br><span class="line"> </span><br><span class="line"> case YYEncodingTypeNSValue:</span><br><span class="line"> case YYEncodingTypeNSNumber:</span><br><span class="line"> case YYEncodingTypeNSDecimalNumber: {</span><br><span class="line"> } break;</span><br><span class="line"> </span><br><span class="line"> case YYEncodingTypeNSData:</span><br><span class="line"> case YYEncodingTypeNSMutableData: {</span><br><span class="line"> } break;</span><br><span class="line"> </span><br><span class="line"> case YYEncodingTypeNSDate: {</span><br><span class="line"> } break;</span><br><span class="line"> </span><br><span class="line"> case YYEncodingTypeNSURL: {</span><br><span class="line"> } break;</span><br><span class="line"> </span><br><span class="line"> case YYEncodingTypeNSArray:</span><br><span class="line"> case YYEncodingTypeNSMutableArray: {</span><br><span class="line"> } break;</span><br><span class="line"> </span><br><span class="line"> case YYEncodingTypeNSDictionary:</span><br><span class="line"> case YYEncodingTypeNSMutableDictionary: {</span><br><span class="line"> } break;</span><br><span class="line"> </span><br><span class="line"> case YYEncodingTypeNSSet:</span><br><span class="line"> case YYEncodingTypeNSMutableSet: {</span><br><span class="line"> } // break; commented for code coverage in next line</span><br><span class="line"> </span><br><span class="line"> default: break;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> } else {</span><br><span class="line"> BOOL isNull = (value == (id)kCFNull);</span><br><span class="line"> switch (meta->_type & YYEncodingTypeMask) {</span><br><span class="line"> case YYEncodingTypeObject: {</span><br><span class="line"> } break;</span><br><span class="line"> </span><br><span class="line"> case YYEncodingTypeClass: {</span><br><span class="line"> } break;</span><br><span class="line"> </span><br><span class="line"> case YYEncodingTypeSEL: {</span><br><span class="line"> } break;</span><br><span class="line"> </span><br><span class="line"> case YYEncodingTypeBlock: {</span><br><span class="line"> } break;</span><br><span class="line"> </span><br><span class="line"> case YYEncodingTypeStruct:</span><br><span class="line"> case YYEncodingTypeUnion:</span><br><span class="line"> case YYEncodingTypeCArray: {</span><br><span class="line"> } break;</span><br><span class="line"> </span><br><span class="line"> case YYEncodingTypePointer:</span><br><span class="line"> case YYEncodingTypeCString: {</span><br><span class="line"> } // break; commented for code coverage in next line</span><br><span class="line"> </span><br><span class="line"> default: break;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h6 id="Number类型转成属性"><a href="#Number类型转成属性" class="headerlink" title="Number类型转成属性"></a>Number类型转成属性</h6><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">static force_inline void ModelSetNumberToProperty(__unsafe_unretained id model,</span><br><span class="line"> __unsafe_unretained NSNumber *num,</span><br><span class="line"> __unsafe_unretained _YYModelPropertyMeta *meta) {</span><br><span class="line"> switch (meta->_type & YYEncodingTypeMask) {</span><br><span class="line"> case YYEncodingTypeBool: {</span><br><span class="line"> </span><br><span class="line"> //最终通过objc_msgSend发送消息的形式，实现model的该属性的setter方法</span><br><span class="line"> ((void (*)(id, SEL, bool))(void *) objc_msgSend)((id)model, meta->_setter, num.boolValue);</span><br><span class="line"> } break;</span><br><span class="line"> case ...//基本雷同，看上面一行代码就行</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h5 id="最终通过objc-msgSend发送消息的形式，实现model的该属性的setter方法"><a href="#最终通过objc-msgSend发送消息的形式，实现model的该属性的setter方法" class="headerlink" title="最终通过objc_msgSend发送消息的形式，实现model的该属性的setter方法"></a>最终通过objc_msgSend发送消息的形式，实现model的该属性的setter方法</h5><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">((void (*)(id, SEL, bool))(void *) objc_msgSend)((id)model, meta->_setter, num.boolValue);</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">/** objc_msgSend</span><br><span class="line"> 定义:'为某个类对象发送消息，并且返回一个值' </span><br><span class="line"> 参数1: 消息接收的对象实例 </span><br><span class="line"> 参数2: 要执行的方法 </span><br><span class="line"> ...: 一系列其他参数 */</span><br><span class="line">id objc_msgSend(id self, SEL op, ...)</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">//实现的伪代码...</span><br><span class="line">id objc_msgSend(id self, SEL op, ...) {</span><br><span class="line"> if (!self) return nil;</span><br><span class="line"> //关键代码</span><br><span class="line"> IMP imp = class_getMethodImplementation(self->isa, SEL op);</span><br><span class="line"> imp(self, op, ...); </span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h5 id="以上大概就是json-to-model整个过程"><a href="#以上大概就是json-to-model整个过程" class="headerlink" title="以上大概就是json-to-model整个过程"></a>以上大概就是json-to-model整个过程</h5><h3 id="三、model-to-json过程解析"><a href="#三、model-to-json过程解析" class="headerlink" title="三、model-to-json过程解析"></a>三、model-to-json过程解析</h3><h6 id="最后解析的json要满足苹果规定："><a href="#最后解析的json要满足苹果规定：" class="headerlink" title="最后解析的json要满足苹果规定："></a>最后解析的json要满足苹果规定：</h6><ul>
<li>最后解析的json一定是字典或数组</li>
<li>json内每一项都应该是NSString、NSNumber、NSArray、NSDictionary、NSNull的一种</li>
<li>所有字典的key都应该是NSString</li>
<li>值类型不能是非数值的或无穷的</li>
</ul>
<h5 id="id-modelToJSONObject"><a href="#id-modelToJSONObject" class="headerlink" title="- (id)modelToJSONObject;"></a>- (id)modelToJSONObject;</h5><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">- (id)modelToJSONObject {</span><br><span class="line"> /*</span><br><span class="line"> Apple said:</span><br><span class="line"> The top level object is an NSArray or NSDictionary.</span><br><span class="line"> All objects are instances of NSString, NSNumber, NSArray, NSDictionary, or NSNull.</span><br><span class="line"> All dictionary keys are instances of NSString.</span><br><span class="line"> Numbers are not NaN or infinity.</span><br><span class="line"> */</span><br><span class="line"> // 最终都是调用递归转换方法</span><br><span class="line"> id jsonObject = ModelToJSONObjectRecursive(self);</span><br><span class="line"> if ([jsonObject isKindOfClass:[NSArray class]]) return jsonObject;</span><br><span class="line"> if ([jsonObject isKindOfClass:[NSDictionary class]]) return jsonObject;</span><br><span class="line"> return nil;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h6 id="static-id-ModelToJSONObjectRecursive-NSObject-model"><a href="#static-id-ModelToJSONObjectRecursive-NSObject-model" class="headerlink" title="static id ModelToJSONObjectRecursive(NSObject *model);"></a>static id ModelToJSONObjectRecursive(NSObject *model);</h6><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br><span class="line">126</span><br><span class="line">127</span><br><span class="line">128</span><br><span class="line">129</span><br><span class="line">130</span><br><span class="line">131</span><br><span class="line">132</span><br><span class="line">133</span><br><span class="line">134</span><br><span class="line">135</span><br><span class="line">136</span><br><span class="line">137</span><br><span class="line">138</span><br><span class="line">139</span><br><span class="line">140</span><br><span class="line">141</span><br><span class="line">142</span><br><span class="line">143</span><br><span class="line">144</span><br><span class="line">145</span><br><span class="line">146</span><br><span class="line">147</span><br><span class="line">148</span><br><span class="line">149</span><br><span class="line">150</span><br></pre></td><td class="code"><pre><span class="line">static id ModelToJSONObjectRecursive(NSObject *model) {</span><br><span class="line"></span><br><span class="line"> //model为nil、空值、string、number直接返回，不用再往下递归解析</span><br><span class="line"> if (!model || model == (id)kCFNull) return model;</span><br><span class="line"> if ([model isKindOfClass:[NSString class]]) return model;</span><br><span class="line"> if ([model isKindOfClass:[NSNumber class]]) return model;</span><br><span class="line"> </span><br><span class="line"> //字典需要遍历每一项<key,value>，同时创建一个新字典，key必须string；</span><br><span class="line"> //value若为nil、空值、string、number则不必再往下解析，直接赋值给新字典;</span><br><span class="line"> //value若为字典、数组等，则继续往下递归解析，最终的值也是赋值给新字典；</span><br><span class="line"> if ([model isKindOfClass:[NSDictionary class]]) {</span><br><span class="line"> if ([NSJSONSerialization isValidJSONObject:model]) return model;</span><br><span class="line"> NSMutableDictionary *newDic = [NSMutableDictionary new];</span><br><span class="line"> [((NSDictionary *)model) enumerateKeysAndObjectsUsingBlock:^(NSString *key, id obj, BOOL *stop) {</span><br><span class="line"> NSString *stringKey = [key isKindOfClass:[NSString class]] ? key : key.description;</span><br><span class="line"> if (!stringKey) return;</span><br><span class="line"> id jsonObj = ModelToJSONObjectRecursive(obj);</span><br><span class="line"> if (!jsonObj) jsonObj = (id)kCFNull;</span><br><span class="line"> newDic[stringKey] = jsonObj;</span><br><span class="line"> }];</span><br><span class="line"> return newDic;</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> //NSSet</span><br><span class="line"> if ([model isKindOfClass:[NSSet class]]) {</span><br><span class="line"> NSArray *array = ((NSSet *)model).allObjects;</span><br><span class="line"> if ([NSJSONSerialization isValidJSONObject:array]) return array;</span><br><span class="line"> NSMutableArray *newArray = [NSMutableArray new];</span><br><span class="line"> for (id obj in array) {</span><br><span class="line"> if ([obj isKindOfClass:[NSString class]] || [obj isKindOfClass:[NSNumber class]]) {</span><br><span class="line"> [newArray addObject:obj];</span><br><span class="line"> } else {</span><br><span class="line"> id jsonObj = ModelToJSONObjectRecursive(obj);</span><br><span class="line"> if (jsonObj && jsonObj != (id)kCFNull) [newArray addObject:jsonObj];</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> return newArray;</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> //NSArray</span><br><span class="line"> if ([model isKindOfClass:[NSArray class]]) {</span><br><span class="line"> if ([NSJSONSerialization isValidJSONObject:model]) return model;</span><br><span class="line"> NSMutableArray *newArray = [NSMutableArray new];</span><br><span class="line"> for (id obj in (NSArray *)model) {</span><br><span class="line"> if ([obj isKindOfClass:[NSString class]] || [obj isKindOfClass:[NSNumber class]]) {</span><br><span class="line"> [newArray addObject:obj];</span><br><span class="line"> } else {</span><br><span class="line"> id jsonObj = ModelToJSONObjectRecursive(obj);</span><br><span class="line"> if (jsonObj && jsonObj != (id)kCFNull) [newArray addObject:jsonObj];</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> return newArray;</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> //比较特殊的四种类型：NSURL、NSAttributedString、NSDate、NSData</span><br><span class="line"> //NSURL返回完整的url字符串</span><br><span class="line"> if ([model isKindOfClass:[NSURL class]]) return ((NSURL *)model).absoluteString;</span><br><span class="line"> if ([model isKindOfClass:[NSAttributedString class]]) return ((NSAttributedString *)model).string;</span><br><span class="line"> if ([model isKindOfClass:[NSDate class]]) return [YYISODateFormatter() stringFromDate:(id)model];</span><br><span class="line"> if ([model isKindOfClass:[NSData class]]) return nil;</span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line"> //如果是model是类创建的对象，则需要将model的属性（key、keyPath、keys）方式解析</span><br><span class="line"> _YYModelMeta *modelMeta = [_YYModelMeta metaWithClass:[model class]];</span><br><span class="line"> </span><br><span class="line"> //属性个数为0</span><br><span class="line"> if (!modelMeta || modelMeta->_keyMappedCount == 0) return nil;</span><br><span class="line"> </span><br><span class="line"> //将该model转化成字典</span><br><span class="line"> NSMutableDictionary *result = [[NSMutableDictionary alloc] initWithCapacity:64];</span><br><span class="line"> </span><br><span class="line"> //__unsafe_unretained 的好处就是 编译器不用去管理内存，提高性能</span><br><span class="line"> __unsafe_unretained NSMutableDictionary *dic = result; // avoid retain and release in block</span><br><span class="line"> </span><br><span class="line"> //按照属性key、keys、keyPath遍历</span><br><span class="line"> [modelMeta->_mapper enumerateKeysAndObjectsUsingBlock:^(NSString *propertyMappedKey, _YYModelPropertyMeta *propertyMeta, BOOL *stop) {</span><br><span class="line"> </span><br><span class="line"> //最终是通过objc_sendMsg调用getter获取value</span><br><span class="line"> if (!propertyMeta->_getter) return;</span><br><span class="line"> </span><br><span class="line"> id value = nil;</span><br><span class="line"> if (propertyMeta->_isCNumber) {</span><br><span class="line"> </span><br><span class="line"> //C Number 的方式getter Value</span><br><span class="line"> value = ModelCreateNumberFromProperty(model, propertyMeta);</span><br><span class="line"> </span><br><span class="line"> //NS类型：NSString、NSArray等</span><br><span class="line"> } else if (propertyMeta->_nsType) {</span><br><span class="line"> </span><br><span class="line"> //最底层的objc_msgSend调用，取出的值继续递归解析，其他情况雷同，不一一看了</span><br><span class="line"> id v = ((id (*)(id, SEL))(void *) objc_msgSend)((id)model, propertyMeta->_getter);</span><br><span class="line"> value = ModelToJSONObjectRecursive(v);</span><br><span class="line"> } else {</span><br><span class="line"> switch (propertyMeta->_type & YYEncodingTypeMask) {</span><br><span class="line"> case YYEncodingTypeObject: {</span><br><span class="line"> id v = ((id (*)(id, SEL))(void *) objc_msgSend)((id)model, propertyMeta->_getter);</span><br><span class="line"> value = ModelToJSONObjectRecursive(v);</span><br><span class="line"> if (value == (id)kCFNull) value = nil;</span><br><span class="line"> } break;</span><br><span class="line"> case YYEncodingTypeClass: {</span><br><span class="line"> Class v = ((Class (*)(id, SEL))(void *) objc_msgSend)((id)model, propertyMeta->_getter);</span><br><span class="line"> value = v ? NSStringFromClass(v) : nil;</span><br><span class="line"> } break;</span><br><span class="line"> case YYEncodingTypeSEL: {</span><br><span class="line"> SEL v = ((SEL (*)(id, SEL))(void *) objc_msgSend)((id)model, propertyMeta->_getter);</span><br><span class="line"> value = v ? NSStringFromSelector(v) : nil;</span><br><span class="line"> } break;</span><br><span class="line"> default: break;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> if (!value) return;</span><br><span class="line"> </span><br><span class="line"> if (propertyMeta->_mappedToKeyPath) {</span><br><span class="line"> NSMutableDictionary *superDic = dic;</span><br><span class="line"> NSMutableDictionary *subDic = nil;</span><br><span class="line"> for (NSUInteger i = 0, max = propertyMeta->_mappedToKeyPath.count; i < max; i++) {</span><br><span class="line"> NSString *key = propertyMeta->_mappedToKeyPath[i];</span><br><span class="line"> if (i + 1 == max) { // end</span><br><span class="line"> if (!superDic[key]) superDic[key] = value;</span><br><span class="line"> break;</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> subDic = superDic[key];</span><br><span class="line"> if (subDic) {</span><br><span class="line"> if ([subDic isKindOfClass:[NSDictionary class]]) {</span><br><span class="line"> subDic = subDic.mutableCopy;</span><br><span class="line"> superDic[key] = subDic;</span><br><span class="line"> } else {</span><br><span class="line"> break;</span><br><span class="line"> }</span><br><span class="line"> } else {</span><br><span class="line"> subDic = [NSMutableDictionary new];</span><br><span class="line"> superDic[key] = subDic;</span><br><span class="line"> }</span><br><span class="line"> superDic = subDic;</span><br><span class="line"> subDic = nil;</span><br><span class="line"> }</span><br><span class="line"> } else {</span><br><span class="line"> if (!dic[propertyMeta->_mappedToKey]) {</span><br><span class="line"> dic[propertyMeta->_mappedToKey] = value;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }];</span><br><span class="line"> </span><br><span class="line"> if (modelMeta->_hasCustomTransformToDictionary) {</span><br><span class="line"> BOOL suc = [((id<YYModel>)model) modelCustomTransformToDictionary:dic];</span><br><span class="line"> if (!suc) return nil;</span><br><span class="line"> }</span><br><span class="line"> return result;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h5 id="以上大概就是model-to-json的过程"><a href="#以上大概就是model-to-json的过程" class="headerlink" title="以上大概就是model-to-json的过程"></a>以上大概就是model-to-json的过程</h5><p>另外，还有model-to-data、model-to-string等方法，都是先调用model-to-json，然后再利用系统的NSJSONSerialization、initWithData:encoding:进行转换</p>
<p>####### modelToJSONData<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">//先model-to-json，再json-to-data</span><br><span class="line">- (NSData *)modelToJSONData {</span><br><span class="line"> id jsonObject = [self modelToJSONObject];</span><br><span class="line"> if (!jsonObject) return nil;</span><br><span class="line"> return [NSJSONSerialization dataWithJSONObject:jsonObject options:0 error:NULL];</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>####### modelToJSONString<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">//先model-to-data，再data-to-string</span><br><span class="line">- (NSString *)modelToJSONString {</span><br><span class="line"> NSData *jsonData = [self modelToJSONData];</span><br><span class="line"> if (jsonData.length == 0) return nil;</span><br><span class="line"> return [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<h5 id="以上，解析json-to-model、model-to-json的转换过程解读完毕"><a href="#以上，解析json-to-model、model-to-json的转换过程解读完毕" class="headerlink" title="以上，解析json-to-model、model-to-json的转换过程解读完毕"></a>以上，解析json-to-model、model-to-json的转换过程解读完毕</h5><h3 id="四、一些宏的使用"><a href="#四、一些宏的使用" class="headerlink" title="四、一些宏的使用"></a>四、一些宏的使用</h3><p>1、NS_ASSUME_NONNULL_BEGIN、NS_ASSUME_NONNULL_END<br>我们可以给每个属性或每个方法都去指定 <strong>nullable 和 _</strong>nonnull，当一个类中，有的方法或属性给它指定了 <strong>nullable 和 _</strong>nonnull，其他方法又没有指定，编译器会爆警告。这时候可以全局使用NS_ASSUME_NONNULL_BEGIN、NS_ASSUME_NONNULL_END，然后再单独指定你要指定为__nullable的属性和方法。</p>
<p>2、#define force_inline <strong>inline</strong> <strong>attribute</strong>((always_inline))<br><strong>attribute</strong>((always_inline))的意思是强制内联，<br>所有加了<strong>attribute</strong>((always_inline))的函数再被调用时不会被编译成函数调用而是直接扩展到调用函数体内</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">force_inline void a() {</span><br><span class="line"> print("hello");</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">void b()｛</span><br><span class="line"> a();</span><br><span class="line">｝</span><br></pre></td></tr></table></figure>
<p>b调用a函数的汇编代码不会是跳转到a执行，而是a函数的代码直接在b内成为b的一部分。<br>用force_inline代替 <strong>inline</strong> <strong>attribute</strong>((always_inline))，是因为比较方便。</p>
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