[41/51] [abbrv] [partial] incubator-weex-site git commit: Site updated: 2017-05-18 15:35:46

Thu, 18 May 2017 00:37:32 -0700 

http://git-wip-us.apache.org/repos/asf/incubator-weex-site/blob/d332a30e/cn/references/advanced/extend-to-ios.html
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-<!DOCTYPE html>
-<html>
-<head>
-  <meta charset="utf-8">
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-  <title>iOS 扩展 | Weex</title>
-  <meta name="viewport" content="width=device-width, initial-scale=1, 
maximum-scale=1">
-  <meta name="description" content="注意Weex 所有暴露给  JS 的内置 
module 或 component API 都是安全和可控的， 
它们不会去访问系统的私有 API ，也不会去做任何 runtime 
上的 hack 更不会去改变应用原有的功能定位。 
如果需要扩展自定义的 module 或者 component ，一定注意不要将 
OC 的 runtime 暴露给 JS ， 不要将一些诸如 dlopen()， dlsym()">
-<meta property="og:type" content="website">
-<meta property="og:title" content="iOS 扩展">
-<meta property="og:url" 
content="https://weex-project.io/cn/references/advanced/extend-to-ios.html";>
-<meta property="og:site_name" content="Weex">
-<meta property="og:description" content="注意Weex 所有暴露给  JS 的内
置 module 或 component API 都是安全和可控的， 
它们不会去访问系统的私有 API ，也不会去做任何 runtime 
上的 hack 更不会去改变应用原有的功能定位。 
如果需要扩展自定义的 module 或者 component ，一定注意不要将 
OC 的 runtime 暴露给 JS ， 不要将一些诸如 dlopen()， dlsym()">
-<meta property="og:updated_time" content="2017-05-17T07:17:21.000Z">
-<meta name="twitter:card" content="summary">
-<meta name="twitter:title" content="iOS 扩展">
-<meta name="twitter:description" content="注意Weex 所有暴露给  JS 的内
置 module 或 component API 都是安全和可控的， 
它们不会去访问系统的私有 API ，也不会去做任何 runtime 
上的 hack 更不会去改变应用原有的功能定位。 
如果需要扩展自定义的 module 或者 component ，一定注意不要将 
OC 的 runtime 暴露给 JS ， 不要将一些诸如 dlopen()， dlsym()">
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class="sidebar-link  ">通用特性</a></h3>
-        
-          <ul class="chapter">
-            
-              <li>
-                <a href="/cn/references/ios-apis.html" class="sidebar-link  
">iOS APIs</a>
-              </li>
-            
-              <li>
-                <a href="/cn/references/android-apis.html" class="sidebar-link 
 ">Android APIs</a>
-              </li>
-            
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-                <a href="/cn/references/html5-apis.html" class="sidebar-link  
">HTML5 APIs</a>
-              </li>
-            
-              <li>
-                <a href="/cn/references/jsfm-apis.html" class="sidebar-link  
">JS Framework APIs</a>
-              </li>
-            
-              <li>
-                <a href="/cn/references/common-style.html" class="sidebar-link 
 ">通用样式</a>
-              </li>
-            
-              <li>
-                <a href="/cn/references/text-style.html" class="sidebar-link  
">文本样式</a>
-              </li>
-            
-              <li>
-                <a href="/cn/references/color-names.html" class="sidebar-link  
">颜色名称列表</a>
-              </li>
-            
-              <li>
-                <a href="/cn/references/gesture.html" class="sidebar-link  
">手势</a>
-              </li>
-            
-              <li>
-                <a href="/cn/references/path.html" class="sidebar-link  ">Path 
(英)</a>
-              </li>
-            
-          </ul>
-        
-      </li>
-    
-      <li>
-        <h3 class="chapter-title"><a 
href="/cn/references/components/index.html" class="sidebar-link  ">内
建组件</a></h3>
-        
-          <ul class="chapter">
-            
-              <li>
-                <a href="/cn/references/components/a.html" class="sidebar-link 
 ">&lt;a&gt;</a>
-              </li>
-            
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-                <a href="/cn/references/components/indicator.html" 
class="sidebar-link  ">&lt;indicator&gt;</a>
-              </li>
-            
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-                <a href="/cn/references/components/slider.html" 
class="sidebar-link  ">&lt;slider&gt;</a>
-              </li>
-            
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-                <a href="/cn/references/components/switch.html" 
class="sidebar-link  ">&lt;switch&gt;</a>
-              </li>
-            
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-                <a href="/cn/references/components/text.html" 
class="sidebar-link  ">&lt;text&gt;</a>
-              </li>
-            
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-                <a href="/cn/references/components/textarea.html" 
class="sidebar-link  ">&lt;textarea&gt;</a>
-              </li>
-            
-              <li>
-                <a href="/cn/references/components/video.html" 
class="sidebar-link  ">&lt;video&gt;</a>
-              </li>
-            
-              <li>
-                <a href="/cn/references/components/web.html" 
class="sidebar-link  ">&lt;web&gt;</a>
-              </li>
-            
-              <li>
-                <a href="/cn/references/components/div.html" 
class="sidebar-link  ">&lt;div&gt;</a>
-              </li>
-            
-              <li>
-                <a href="/cn/references/components/image.html" 
class="sidebar-link  ">&lt;image&gt;</a>
-              </li>
-            
-              <li>
-                <a href="/cn/references/components/list.html" 
class="sidebar-link  ">&lt;list&gt;</a>
-              </li>
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-                <a href="/cn/references/components/input.html" 
class="sidebar-link  ">&lt;input&gt;</a>
-              </li>
-            
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-                <a href="/cn/references/components/waterfall.html" 
class="sidebar-link  ">&lt;waterfall&gt;</a>
-              </li>
-            
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-                <a href="/cn/references/components/cell.html" 
class="sidebar-link  ">&lt;cell&gt;</a>
-              </li>
-            
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-                <a href="/cn/references/components/loading.html" 
class="sidebar-link  ">&lt;loading&gt;</a>
-              </li>
-            
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-                <a href="/cn/references/components/refresh.html" 
class="sidebar-link  ">&lt;refresh&gt;</a>
-              </li>
-            
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-                <a href="/cn/references/components/scroller.html" 
class="sidebar-link  ">&lt;scroller&gt;</a>
-              </li>
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-          </ul>
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-      </li>
-    
-      <li>
-        <h3 class="chapter-title"><a href="/cn/references/modules/index.html" 
class="sidebar-link  ">内建模块</a></h3>
-        
-          <ul class="chapter">
-            
-              <li>
-                <a href="/cn/references/modules/animation.html" 
class="sidebar-link  ">animation</a>
-              </li>
-            
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-                <a href="/cn/references/modules/websocket.html" 
class="sidebar-link  ">WebSocket</a>
-              </li>
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-                <a href="/cn/references/modules/picker.html" 
class="sidebar-link  ">picker</a>
-              </li>
-            
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-                <a href="/cn/references/modules/clipboard.html" 
class="sidebar-link  ">clipboard</a>
-              </li>
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-                <a href="/cn/references/modules/dom.html" class="sidebar-link  
">dom</a>
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-                <a href="/cn/references/modules/modal.html" 
class="sidebar-link  ">modal</a>
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-                <a href="/cn/references/modules/navigator.html" 
class="sidebar-link  ">navigator</a>
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-                <a href="/cn/references/modules/storage.html" 
class="sidebar-link  ">storage</a>
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class="sidebar-link  ">stream</a>
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class="sidebar-link  ">webview</a>
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class="sidebar-link  ">globalEvent</a>
-              </li>
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-        <h3 class="chapter-title"><a href="/cn/references/unit.html" 
class="sidebar-link  ">CSS 单位</a></h3>
-        
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-        <h3 class="chapter-title"><a href="/cn/references/common-event.html" 
class="sidebar-link  ">通用事件</a></h3>
-        
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-      <li>
-        <h3 class="chapter-title"><a href="/cn/references/native-dom-api.html" 
class="sidebar-link  ">Native DOM APIs</a></h3>
-        
-      </li>
-    
-      <li>
-        <h3 class="chapter-title"><a href="/cn/references/weex-variable.html" 
class="sidebar-link  ">Weex 实例变量</a></h3>
-        
-      </li>
-    
-      <li>
-        <h3 class="chapter-title"><a href="/cn/references/web-standards.html" 
class="sidebar-link  ">Web 标准</a></h3>
-        
-      </li>
-    
-      <li>
-        <h3 class="chapter-title"><a 
href="/cn/references/js-service/index.html" class="sidebar-link  ">JS 
Service</a></h3>
-        
-      </li>
-    
-      <li>
-        <h3 class="chapter-title"><a href="/cn/references/vue/index.html" 
class="sidebar-link  ">Vue</a></h3>
-        
-          <ul class="chapter">
-            
-              <li>
-                <a href="/cn/references/vue/difference-with-web.html" 
class="sidebar-link  ">Vue 2.x 在 Weex 和 Web 中的差异</a>
-              </li>
-            
-              <li>
-                <a href="/cn/references/vue/difference-of-vuex.html" 
class="sidebar-link  ">使用 Vuex 和 vue-router</a>
-              </li>
-            
-          </ul>
-        
-      </li>
-    
-      <li>
-        <h3 class="chapter-title"><a href="/cn/references/advanced/index.html" 
class="sidebar-link  ">高阶知识</a></h3>
-        
-          <ul class="chapter">
-            
-              <li>
-                <a href="/cn/references/advanced/extend-to-ios.html" 
class="sidebar-link current ">iOS 扩展</a>
-              </li>
-            
-              <li>
-                <a href="/cn/references/advanced/extend-to-android.html" 
class="sidebar-link  ">Android 扩展</a>
-              </li>
-            
-              <li>
-                <a href="/cn/references/advanced/extend-to-html5.html" 
class="sidebar-link  ">HTML5 扩展</a>
-              </li>
-            
-              <li>
-                <a href="/cn/references/advanced/extend-jsfm.html" 
class="sidebar-link  ">拓展 JS framework</a>
-              </li>
-            
-              <li>
-                <a 
href="/cn/references/advanced/integrate-devtool-to-android.html" 
class="sidebar-link  ">集成 Devtools 到 Android</a>
-              </li>
-            
-              <li>
-                <a 
href="/cn/references/advanced/integrate-devtool-to-ios.html" 
class="sidebar-link  ">集成 Devtools 到 iOS</a>
-              </li>
-            
-          </ul>
-        
-      </li>
-    
-      <li>
-        <h3 class="chapter-title"><a 
href="/cn/references/platform-difference.html" class="sidebar-link  ">Weex 和 
Web 平台的差异</a></h3>
-        
-          <ul class="chapter">
-            
-              <li>
-                <a href="/cn/references/migration/index.html" 
class="sidebar-link  ">迁移</a>
-              </li>
-            
-              <li>
-                <a href="/cn/references/migration/migration-from-weex.html" 
class="sidebar-link  ">如何将原有 Weex 项目改造成 Vue 版本</a>
-              </li>
-            
-              <li>
-                <a href="/cn/references/migration/difference.html" 
class="sidebar-link  ">Weex 和 Vue 2.x 的语法差异</a>
-              </li>
-            
-          </ul>
-        
-      </li>
-    
-    
-  </ul>
-</div>
-  </div>
-  
-
-<article class="article article-type-references">
-  <div class="article-entry" itemprop="articleBody">
-    <header class="article-header">
-  
-    
-      <h1 class="article-title" itemprop="name">
-        iOS 扩展
-      </h1>
-    
-  
-  <time class="article-date" datetime="2017-05-17T07:17:21.000Z">Updated time: 
17/05/2017</time>
-</header>
-    <h2 id="注意"><a href="#注意" class="headerlink" 
title="注意"></a>注意</h2><p><strong>Weex 所有暴露给  JS 的内置 
module 或 component API 都是安全和可控的， 
它们不会去访问系统的私有 API ，也不会去做任何 runtime 
上的 hack 更不会去改变应用原有的功能定位。</strong></p>
-<p><strong>如果需要扩展自定义的 module 或者 component 
，一定注意不要将 OC 的 runtime 暴露给 JS ， 不要将一些诸如 
<code>dlopen()</code>， <code>dlsym()</code>， 
<code>respondsToSelector:</code>，<code>performSelector:</code>，<code>method_exchangeImplementations()</code>
 的动态和不可控的方法暴露给JS， 
也不要将系统的私有API暴露给JS</strong></p>
-<h2 id="Module-扩展"><a href="#Module-扩展" class="headerlink" 
title="Module 扩展"></a>Module 扩展</h2><p><a 
href="https://github.com/weexteam/article/issues/55"; target="_blank" 
rel="external">swift</a> 扩展 module </p>
-<p>Weex SDK 只提供渲染，而不是其他的能力，如果你需要 
像网络，图片，URL跳转这些特性，需要自己动手实现他们<br>例如，如果ä½
 æƒ³å®žçŽ°ä¸€ä¸ªurl地址跳转函数，你可以按照如下步骤实现一个 
Module</p>
-<h3 id="自定义module的步骤"><a href="#自定义module的步骤" 
class="headerlink" 
title="自定义module的步骤"></a><strong>自定义module的步骤</strong></h3><ol>
-<li>自定义的module类 必须实现 <code>WXModuleProtocol</code></li>
-<li>必须添加宏<code>WX_EXPORT_METHOD</code>, 
它可以被weex识别，它的参数是 JavaScript调用 
module指定方法的参数</li>
-<li>添加<code>@synthesized 
weexInstance</code>，每个moudle对象被绑定到一个指定的实例上</li>
-<li>Module 
方法会在UI线程中被调用，所以不要做太多耗时的任务在这里，如果要在å
…¶ä»–线程执行整个module 
方法，需要实现<code>WXModuleProtocol</code>中<code>- (NSThread 
*)targetExecuteThread</code>的方法，这æ 
·ï¼Œåˆ†å‘到这个module的任务会在指定的线程中运行</li>
-<li>Weex 的参数可以是 String 或者Map</li>
-<li><p>Module 支持返回值给 
JavaScript中的回调，回调的类型是<code>WXModuleCallback</code>,回调的参数可以是String或è€
…Map</p>
- <figure class="highlight plain"><table><tr><td class="code"><pre><div 
class="line">@implementation WXEventModule</div><div class="line">@synthesize 
weexInstance;</div><div class="line">    
WX_EXPORT_METHOD(@selector(openURL:callback))</div><div class="line">- 
(void)openURL:(NSString *)url callback:(WXModuleCallback)callback</div><div 
class="line">&#123;</div><div class="line">    NSString *newURL = 
url;</div><div class="line">    if ([url hasPrefix:@&quot;//&quot;]) 
&#123;</div><div class="line">        newURL = [NSString 
stringWithFormat:@&quot;http:%@&quot;, url];</div><div class="line">    &#125; 
else if (![url hasPrefix:@&quot;http&quot;]) &#123;</div><div class="line">     
   newURL = [NSURL URLWithString:url 
relativeToURL:weexInstance.scriptURL].absoluteString;</div><div class="line">   
 &#125;</div><div class="line"></div><div class="line">    UIViewController 
*controller = [[WXDemoViewController alloc] init];</div><div class="line">    
((WXDemoViewController *)controller).u
 rl = [NSURL URLWithString:newURL];</div><div class="line"></div><div 
class="line">    [[weexInstance.viewController navigationController] 
pushViewController:controller animated:YES];</div><div class="line">    
callback(@&#123;@&quot;result&quot;:@&quot;success&quot;&#125;);</div><div 
class="line">&#125;</div><div class="line"></div><div 
class="line">@end</div></pre></td></tr></table></figure>
-</li>
-</ol>
-<h4 id="暴露同步方法v0-10"><a href="#暴露同步方法v0-10" 
class="headerlink" title="暴露同步方法v0.10+"></a>暴露同步方法<span 
class="api-version">v0.10+</span></h4><p>如果你
想要暴露同步的native方法给JS， 
即JS可以直接拿到Native的返回值。 你
可以使用<code>WX_EXPORT_METHOD_SYNC</code> 宏。</p>
-<p>native 代码:</p>
-<figure class="highlight plain"><table><tr><td class="code"><pre><div 
class="line">@implementation WXEventModule</div><div class="line"></div><div 
class="line">WX_EXPORT_METHOD_SYNC(@selector(getString))</div><div 
class="line">  </div><div class="line">- (NSString *)getString</div><div 
class="line">&#123;</div><div class="line">    return 
@&quot;testString&quot;;</div><div class="line">&#125;</div><div 
class="line"></div><div class="line">@end</div></pre></td></tr></table></figure>
-<p>js 代码:</p>
-<figure class="highlight javascript"><table><tr><td class="code"><pre><div 
class="line"><span class="keyword">const</span> eventModule = 
weex.requireModule(<span class="string">'event'</span>)</div><div 
class="line"><span class="keyword">const</span> returnString = 
syncTest.getString()  <span class="comment">// return 
"testString"</span></div></pre></td></tr></table></figure>
-<p>除了string, 你也可以返回 <code>number/array/dictionary</code> 
类型.</p>
-<p><code>注意:</code>  暴露的同步方法只能在 JS 
线程执行，请不要做太多同步的工作导致JS执行阻塞。</p>
-<p><code>注意:</code>  Vue 2.0 还未支持这个特性，最早会在 0.12 
版本支持</p>
-<h3 id="注册-module"><a href="#注册-module" class="headerlink" 
title="注册 module"></a>注册 module</h3><p>通过调用 WXSDKEngine 中的 
<code>registerModule:withClass</code>方法来注册自己的module</p>
-<figure class="highlight plain"><table><tr><td class="code"><pre><div 
class="line">WXSDKEngine.h</div><div class="line">/**</div><div class="line">*  
@abstract Registers a module for a given name</div><div class="line">*  @param 
name The module name to register</div><div class="line">*  @param clazz  The 
module class to register</div><div class="line">**/</div><div class="line">+ 
(void)registerModule:(NSString *)name withClass:(Class)clazz;</div><div 
class="line">[WXSDKEngine registerModule:@&quot;event&quot; 
withClass:[WXEventModule class]];</div></pre></td></tr></table></figure>
-<h3 id="使用自己的-module"><a href="#使用自己的-module" 
class="headerlink" title="使用自己的 module"></a>使用自己的 
module</h3><p>这里的 require 里面的 event 就是在 上一步调用 
<code>registerModule:</code> 注册 module 时候的 name</p>
-<figure class="highlight javascript"><table><tr><td class="code"><pre><div 
class="line"><span class="keyword">var</span> eventModule = 
weex.requireModule(<span class="string">'event'</span>); </div><div 
class="line">eventModule.openURL(<span class="string">'url'</span>,<span 
class="function"><span class="keyword">function</span>(<span 
class="params">ret</span>) </span>&#123;   </div><div class="line">    
nativeLog(ret);</div><div 
class="line">&#125;);</div></pre></td></tr></table></figure>
-<p>Weex SDK 没有 图片下载，navigation 
操作的能力，请大家自己实现这些 protocol</p>
-<h2 id="WXImgLoaderProtocol"><a href="#WXImgLoaderProtocol" class="headerlink" 
title="WXImgLoaderProtocol"></a>WXImgLoaderProtocol</h2><p>weexSDK 
没有图片下载的能力，需要实现 WXImgLoaderProtocol, 
参考下面的例子</p>
-<figure class="highlight plain"><table><tr><td class="code"><pre><div 
class="line">WXImageLoaderProtocol.h</div><div class="line">@protocol 
WXImgLoaderProtocol &lt;WXModuleProtocol&gt;</div><div 
class="line">/**</div><div class="line">* @abstract Creates a image download 
handler with a given URL</div><div class="line">* @param imageUrl The URL of 
the image to download</div><div class="line">* @param imageFrame  The frame of 
the image you want to set</div><div class="line">* @param options : The options 
to be used for this download</div><div class="line">* @param completedBlock : A 
block called once the download is completed.</div><div class="line">    image : 
the image which has been download to local.</div><div class="line">    error : 
the error which has happened in download.</div><div class="line">    finished : 
a Boolean value indicating whether download action has finished.</div><div 
class="line">*/</div><div 
class="line">-(id&lt;WXImageOperationProtocol&gt;)downloadImageWithUR
 L:(NSString *)url imageFrame:(CGRect)imageFrame userInfo:(NSDictionary 
*)options completed:(void(^)(UIImage *image,  NSError *error, BOOL 
finished))completedBlock;</div><div 
class="line">@end</div></pre></td></tr></table></figure>
-<p>实现上述协议  </p>
-<figure class="highlight plain"><table><tr><td class="code"><pre><div 
class="line">@implementation WXImgLoaderDefaultImpl</div><div 
class="line">#pragma mark -</div><div class="line">#pragma mark 
WXImgLoaderProtocol</div><div class="line"></div><div class="line">- 
(id&lt;WXImageOperationProtocol&gt;)downloadImageWithURL:(NSString *)url 
imageFrame:(CGRect)imageFrame userInfo:(NSDictionary *)userInfo 
completed:(void(^)(UIImage *image,  NSError *error, BOOL 
finished))completedBlock</div><div class="line">&#123;</div><div class="line">  
  if ([url hasPrefix:@&quot;//&quot;]) &#123;</div><div class="line">        
url = [@&quot;http:&quot; stringByAppendingString:url];</div><div class="line"> 
   &#125;</div><div class="line">    return 
(id&lt;WXImageOperationProtocol&gt;)[[SDWebImageManager sharedManager] 
downloadImageWithURL:[NSURL URLWithString:url] options:0 progress:^(NSInteger 
receivedSize, NSInteger expectedSize) &#123;     </div><div class="line">    
&#125; completed:^(UIImage *ima
 ge, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL 
*imageURL) &#123;</div><div class="line">    if (completedBlock) 
&#123;</div><div class="line">        completedBlock(image, error, 
finished);</div><div class="line">    &#125;</div><div class="line">    
&#125;];</div><div class="line">&#125;</div><div 
class="line">@end</div></pre></td></tr></table></figure>
-<h3 id="handler注册"><a href="#handler注册" class="headerlink" 
title="handler注册"></a>handler注册</h3><p>你可以通过WXSDKEngine 
中的 <code>registerHandler:withProtocol</code>注册handler</p>
-<figure class="highlight plain"><table><tr><td class="code"><pre><div 
class="line">WXSDKEngine.h</div><div class="line">/**</div><div class="line">* 
@abstract Registers a handler for a given handler instance and specific 
protocol</div><div class="line">* @param handler The handler instance to 
register</div><div class="line">* @param protocol The protocol to 
confirm</div><div class="line">*/</div><div class="line">+ 
(void)registerHandler:(id)handler withProtocol:(Protocol *)protocol;</div><div 
class="line"></div><div class="line">[WXSDKEngine 
registerHandler:[WXImgLoaderDefaultImpl new] 
withProtocol:@protocol(WXImgLoaderProtocol)]</div></pre></td></tr></table></figure>
-<h2 id="Components-扩展"><a href="#Components-扩展" class="headerlink" 
title="Components 扩展"></a>Components 扩展</h2><p>虽然 WeexSDK 
中有很多的 native 的 Component，但这有可能并不能满足你
的需求。在之前你可能已经写了一些很酷炫 native 
的组件，想包装一下，导入到 Weex 中，因
此我们提供了让开发者实现自己的 native Component。下面将以 
WeexSDK 中已经存在的 Component：<code>image</code> 
为例子，介绍一下如何构建一个 native Component。假设你
已经了解 iOS 开发</p>
-<h3 id="注册-Component"><a href="#注册-Component" class="headerlink" 
title="注册 Component"></a>注册 Component</h3><p>注册一个 component 
比较简单，调用 <code>WXSDKEngine</code> 中的 
<code>registerComponent:withClass:</code> 方法，传入组件的æ 
‡ç­¾åç§°ï¼Œè¿˜æœ‰å¯¹åº”çš„ class  然后你可以创建一个 
<code>WXImageComponent</code> 表示 <code>image</code> 组件的实现。在 
<code>.we</code> 文件中，只需要写 
<code>&lt;image&gt;&lt;/image&gt;</code></p>
-<h3 id="添加属性"><a href="#添加属性" class="headerlink" title="添加
属性"></a>添加属性</h3><p>现在我们要做一些让 image component 
更加强大的事情。既然作为一个图片的 
component，那它应该要有源，给他加上一个  <code>src</code> 
的属性，同时给它加上一个 <code>resize</code> 的属性（可以é…
ç½®çš„有 <code>contain/cover/stretch</code>）</p>
-<figure class="highlight plain"><table><tr><td class="code"><pre><div 
class="line">@interface WXImageComponent ()</div><div class="line"></div><div 
class="line">@property (nonatomic, strong) NSString *imageSrc;</div><div 
class="line">@property (nonatomic, assign) UIViewContentMode 
resizeMode;</div><div class="line"></div><div 
class="line">@end</div></pre></td></tr></table></figure>
-<p>component 中所有的 style，attribute，events 都会被传递到 
Component 的初始化方法中，所以，你
可以在初始化方法中存储你感兴趣的一些属性值</p>
-<figure class="highlight plain"><table><tr><td class="code"><pre><div 
class="line">@implementation WXImageComponent</div><div class="line"></div><div 
class="line">- (instancetype)initWithRef:(NSString *)ref type:(NSString *)type 
styles:(NSDictionary *)styles attributes:(NSDictionary *)attributes 
events:(NSArray *)events weexInstance:(WXSDKInstance *)weexInstance</div><div 
class="line">&#123;</div><div class="line">    if (self = [super 
initWithRef:ref type:type styles:styles attributes:attributes events:events 
weexInstance:weexInstance]) &#123;</div><div class="line">        _imageSrc = 
[WXConvert NSString:attributes[@&quot;src&quot;]];</div><div class="line">      
  _resizeMode = [WXConvert 
UIViewContentMode:attributes[@&quot;resize&quot;]];</div><div 
class="line">&#125;</div><div class="line"></div><div class="line">    return 
self;</div><div class="line">&#125;</div><div class="line"></div><div 
class="line">@end</div></pre></td></tr></table></figure>
-<p>attribute 中拿到的值的类型都是 
<code>id</code>，我们可以用转换方法把它转换到任何值。Weex 
SDK 提供了一些基础的转换方法，可以参考 <code>WXConvert</code> 
类，或者你可以添加自己的转换函数。</p>
-<h3 id="Hooking-渲染生命周期"><a href="#Hooking-渲染生命周期" 
class="headerlink" title="Hooking 渲染生命周期"></a>Hooking 
渲染生命周期</h3><p>native 的 component 是由 Weex 管理的，Weex 
创建，布局，渲染，销毁。Weex 的 component 生命周期都是可以 
hook 的，你可以在这些生命周期中去做自己的事情。</p>
-<table>
-<thead>
-<tr>
-<th style="text-align:center">方法</th>
-<th>描述</th>
-</tr>
-</thead>
-<tbody>
-<tr>
-<td style="text-align:center">initWithRef:type:…</td>
-<td>用给定的属性初始化一个component.</td>
-</tr>
-<tr>
-<td style="text-align:center">layoutDidFinish</td>
-<td>在component完成布局时候会调用.</td>
-</tr>
-<tr>
-<td style="text-align:center">loadView</td>
-<td>创建component管理的view.</td>
-</tr>
-<tr>
-<td style="text-align:center">viewWillLoad</td>
-<td>在component的view加载之前会调用.</td>
-</tr>
-<tr>
-<td style="text-align:center">viewDidLoad</td>
-<td>在component的view加载完之后调用.</td>
-</tr>
-<tr>
-<td style="text-align:center">viewWillUnload</td>
-<td>在component的view被释放之前调用.</td>
-</tr>
-<tr>
-<td style="text-align:center">viewDidUnload</td>
-<td>在component的view被释放之后调用.</td>
-</tr>
-<tr>
-<td style="text-align:center">updateStyles:</td>
-<td>在component的style更新时候调用.</td>
-</tr>
-<tr>
-<td style="text-align:center">updateAttributes:</td>
-<td>在component的attribute更新时候调用.</td>
-</tr>
-<tr>
-<td style="text-align:center">addEvent:</td>
-<td>给component添加event的时候调用.</td>
-</tr>
-<tr>
-<td style="text-align:center">removeEvent:</td>
-<td>在event移除的时候调用.</td>
-</tr>
-</tbody>
-</table>
-<p>在 image component 的例子里面，如果我们需要我们自己的 
image view 的话，可以复写 <code>loadView</code>这个方法.</p>
-<figure class="highlight plain"><table><tr><td class="code"><pre><div 
class="line">- (UIView *)loadView</div><div class="line">&#123;</div><div 
class="line">return [[WXImageView alloc] init];</div><div 
class="line">&#125;</div></pre></td></tr></table></figure>
-<p>现在我们使用 <code>WXImageView</code> 渲染 <code>image</code> 
component。<br>作为一个 image 
component，我们需要拿到服务器图片，而且把它设置进 image 
view 里. 这个操作可以在 <code>viewDidLoad</code> 
方法中做，这个方法是在 view 已经被创建而且加载了时候 
Weex SDK 会调用到，而且 <code>viewDidLoad</code> 这个方法是你
做额外初始化工作比如改变 content mode(也就是设置resize) 
的最好时间.</p>
-<figure class="highlight plain"><table><tr><td class="code"><pre><div 
class="line">- (void)viewDidLoad</div><div class="line">&#123;</div><div 
class="line">    UIImageView *imageView = (UIImageView *)self.view;</div><div 
class="line">    imageView.contentMode = _resizeMode;</div><div class="line">   
 imageView.userInteractionEnabled = YES;</div><div class="line">    
imageView.clipsToBounds = YES;</div><div class="line">    
imageView.exclusiveTouch = YES;</div><div class="line"></div><div class="line"> 
   // Do your image fetching and updating logic</div><div 
class="line">&#125;</div></pre></td></tr></table></figure>
-<p>如果可以改变 image 的 src，也可以 hook 
<code>updateAttributes:</code>  方法来做属性更新操作，当 
<code>updateAttributes:</code> 或者  <code>updateStyles:</code> 
被调用的时候， component 的 view 已经加载完成</p>
-<figure class="highlight plain"><table><tr><td class="code"><pre><div 
class="line">- (void)updateAttributes:(NSDictionary *)attributes</div><div 
class="line">&#123;</div><div class="line">    if 
(attributes[@&quot;src&quot;]) &#123;</div><div class="line">        _imageSrc 
= [WXConvert NSString:attributes[@&quot;src&quot;]];</div><div class="line">    
    // Do your image updating logic</div><div class="line">    &#125;</div><div 
class="line"></div><div class="line">    if (attributes[@&quot;resize&quot;]) 
&#123;</div><div class="line">        _resizeMode = [WXConvert 
UIViewContentMode:attributes[@&quot;resize&quot;]];</div><div class="line">     
   self.view.contentMode = _resizeMode;</div><div class="line">    
&#125;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
-<p>或许你需要考虑更多的生命周期方法去 
Hook，当布局完成时候，像 <code>layoutDidFinish</code>，如果你
想了解更多，可以参考一下<code>WXComponent.h</code> 
声明的方法。</p>
-<p>现在你可以用在任何 <code>.we</code> 文件里面使用 
<code>&lt;image&gt;</code>，而且可以加上 image 的属性。</p>
-<figure class="highlight html"><table><tr><td class="code"><pre><div 
class="line"><span class="tag">&lt;<span class="name">image</span> <span 
class="attr">style</span>=<span class="string">"your-custom-style"</span> <span 
class="attr">src</span>=<span class="string">"image-remote-source"</span> <span 
class="attr">resize</span>=<span 
class="string">"contain/cover/stretch"</span>&gt;</span><span 
class="tag">&lt;/<span 
class="name">image</span>&gt;</span></div></pre></td></tr></table></figure>
-<h5 id="component-方法"><a href="#component-方法" class="headerlink" 
title="component 方法"></a>component 方法</h5><p>WeexSDK 0.9.5 
之后支持了在 js 中直接调用 component 
的方法，这里提供一个例子</p>
-<ul>
-<li><p>自定义一个 WXMyCompoenent 的组件</p>
-<figure class="highlight plain"><table><tr><td class="code"><pre><div 
class="line">@implementation WXMyComponent</div><div 
class="line">WX_EXPORT_METHOD(@selector(focus)) // 
暴露该方法给js</div><div class="line">- 
(instancetype)initWithRef:(NSString *)ref type:(NSString *)type 
styles:(NSDictionary *)styles attributes:(NSDictionary *)attributes 
events:(NSArray *)events weexInstance:(WXSDKInstance *)weexInstance</div><div 
class="line">&#123;</div><div class="line">    if (self = [super 
initWithRef:ref type:type styles:styles attributes:attributes events:events 
weexInstance:weexInstance]) &#123;</div><div class="line">        // handle 
your attributes</div><div class="line">        // handle your styles</div><div 
class="line">    &#125;</div><div class="line">    </div><div class="line">    
return self;</div><div class="line">&#125;</div><div class="line"></div><div 
class="line">- (void)focus</div><div class="line">&#123;</div><div 
class="line">    NSLog(@&quot;you got it&quot;);
 </div><div class="line">&#125;</div><div 
class="line">@end</div></pre></td></tr></table></figure>
-</li>
-<li><p>注册组件 <code>[WXSDKEngine 
registerComponent:@&quot;mycomponent&quot; withClass:[WXMyComponent 
class]]</code></p>
-</li>
-<li><p>在 weex 文件中调用</p>
-<figure class="highlight html"><table><tr><td class="code"><pre><div 
class="line"><span class="tag">&lt;<span 
class="name">template</span>&gt;</span></div><div class="line">  <span 
class="tag">&lt;<span class="name">mycomponent</span> <span 
class="attr">id</span>=<span 
class="string">'mycomponent'</span>&gt;</span><span class="tag">&lt;/<span 
class="name">mycomponent</span>&gt;</span></div><div class="line"><span 
class="tag">&lt;/<span class="name">template</span>&gt;</span></div><div 
class="line"><span class="tag">&lt;<span 
class="name">script</span>&gt;</span><span class="javascript"></span></div><div 
class="line">  <span class="built_in">module</span>.exports = &#123;</div><div 
class="line">    <span class="attr">created</span>:<span class="function"><span 
class="keyword">function</span>(<span class="params"></span>) 
</span>&#123;</div><div class="line">      <span 
class="keyword">this</span>.$el(<span 
class="string">'mycomponent'</span>).focus();</div><div class="line">    &#125
 ;</div><div class="line">  &#125;</div><div class="line"><span 
class="tag">&lt;/<span 
class="name">script</span>&gt;</span></div></pre></td></tr></table></figure>
-</li>
-</ul>
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