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Posted to commits@weex.apache.org by so...@apache.org on 2017/06/19 10:25:43 UTC
[41/51] [abbrv] [partial] incubator-weex-site git commit: Site
updated: 2017-06-19 18:24:52
http://git-wip-us.apache.org/repos/asf/incubator-weex-site/blob/5cd706b2/cn/references/advanced/extend-to-ios.html
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-<!DOCTYPE html>
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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">
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-<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="2017-06-14T04:08:17.000Z">
-<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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-</head>
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-<body id="references" class="lang-cn">
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- <a href="/cn/references/ios-apis.html" class="sidebar-link ">iOS APIs</a>
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- <h3 class="chapter-title"><a href="/cn/references/modules/index.html" class="sidebar-link ">内建模块</a></h3>
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- <a href="/cn/references/modules/animation.html" class="sidebar-link ">animation</a>
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- <a href="/cn/references/modules/globalevent.html" class="sidebar-link ">globalEvent</a>
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- <h3 class="chapter-title"><a href="/cn/references/native-dom-api.html" class="sidebar-link ">Native DOM APIs</a></h3>
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- <h3 class="chapter-title"><a href="/cn/references/weex-variable.html" class="sidebar-link ">Weex 实例变量</a></h3>
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- <h3 class="chapter-title"><a href="/cn/references/web-standards.html" class="sidebar-link ">Web 标准</a></h3>
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- <h3 class="chapter-title"><a href="/cn/references/js-service/index.html" class="sidebar-link ">JS Service</a></h3>
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- <a href="/cn/references/vue/difference-with-web.html" class="sidebar-link ">Vue 2.x 在 Weex 和 Web 中的差异</a>
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- <a href="/cn/references/vue/difference-of-vuex.html" class="sidebar-link ">使用 Vuex 和 vue-router</a>
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- <a href="/cn/references/advanced/integrate-devtool-to-android.html" class="sidebar-link ">集成 Devtools 到 Android</a>
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- <li>
- <a href="/cn/references/jsfm-apis.html" class="sidebar-link ">JS Framework APIs</a>
- </li>
-
- <li>
- <a href="/cn/references/html5-apis.html" class="sidebar-link ">HTML5 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 "><a></a>
- </li>
-
- <li>
- <a href="/cn/references/components/indicator.html" class="sidebar-link "><indicator></a>
- </li>
-
- <li>
- <a href="/cn/references/components/slider.html" class="sidebar-link "><slider></a>
- </li>
-
- <li>
- <a href="/cn/references/components/switch.html" class="sidebar-link "><switch></a>
- </li>
-
- <li>
- <a href="/cn/references/components/text.html" class="sidebar-link "><text></a>
- </li>
-
- <li>
- <a href="/cn/references/components/textarea.html" class="sidebar-link "><textarea></a>
- </li>
-
- <li>
- <a href="/cn/references/components/video.html" class="sidebar-link "><video></a>
- </li>
-
- <li>
- <a href="/cn/references/components/web.html" class="sidebar-link "><web></a>
- </li>
-
- <li>
- <a href="/cn/references/components/div.html" class="sidebar-link "><div></a>
- </li>
-
- <li>
- <a href="/cn/references/components/image.html" class="sidebar-link "><image></a>
- </li>
-
- <li>
- <a href="/cn/references/components/list.html" class="sidebar-link "><list></a>
- </li>
-
- <li>
- <a href="/cn/references/components/waterfall.html" class="sidebar-link "><waterfall></a>
- </li>
-
- <li>
- <a href="/cn/references/components/input.html" class="sidebar-link "><input></a>
- </li>
-
- <li>
- <a href="/cn/references/components/cell.html" class="sidebar-link "><cell></a>
- </li>
-
- <li>
- <a href="/cn/references/components/loading.html" class="sidebar-link "><loading></a>
- </li>
-
- <li>
- <a href="/cn/references/components/refresh.html" class="sidebar-link "><refresh></a>
- </li>
-
- <li>
- <a href="/cn/references/components/scroller.html" class="sidebar-link "><scroller></a>
- </li>
-
- </ul>
-
- </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>
-
- <li>
- <a href="/cn/references/modules/picker.html" class="sidebar-link ">picker</a>
- </li>
-
- <li>
- <a href="/cn/references/modules/websocket.html" class="sidebar-link ">WebSocket</a>
- </li>
-
- <li>
- <a href="/cn/references/modules/clipboard.html" class="sidebar-link ">clipboard</a>
- </li>
-
- <li>
- <a href="/cn/references/modules/dom.html" class="sidebar-link ">dom</a>
- </li>
-
- <li>
- <a href="/cn/references/modules/modal.html" class="sidebar-link ">modal</a>
- </li>
-
- <li>
- <a href="/cn/references/modules/navigator.html" class="sidebar-link ">navigator</a>
- </li>
-
- <li>
- <a href="/cn/references/modules/storage.html" class="sidebar-link ">storage</a>
- </li>
-
- <li>
- <a href="/cn/references/modules/stream.html" class="sidebar-link ">stream</a>
- </li>
-
- <li>
- <a href="/cn/references/modules/webview.html" class="sidebar-link ">webview</a>
- </li>
-
- <li>
- <a href="/cn/references/modules/globalevent.html" class="sidebar-link ">globalEvent</a>
- </li>
-
- </ul>
-
- </li>
-
- <li>
- <h3 class="chapter-title"><a href="/cn/references/unit.html" class="sidebar-link ">CSS 单位</a></h3>
-
- </li>
-
- <li>
- <h3 class="chapter-title"><a href="/cn/references/common-event.html" class="sidebar-link ">通用事件</a></h3>
-
- </li>
-
- <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="2017-06-14T04:08:17.000Z">Updated time: 14/06/2017</time>
-</header>
- <h2 id="注意" class="article-heading"><a href="#注意" class="headerlink" title="注意"></a>注意<a class="article-anchor" href="#注意" aria-hidden="true"></a></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" class="article-heading"><a href="#Module-扩展" class="headerlink" title="Module 扩展"></a>Module 扩展<a class="article-anchor" href="#Module-扩展" aria-hidden="true"></a></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，如果你想实现一个url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" class="article-heading"><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><a class="article-anchor" href="#自定义module的步骤" aria-hidden="true"></a></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，如果要在其他线程执行整个module 方法，需要实现<code>WXModuleProtocol</code>中<code>- (NSThread *)targetExecuteThread</code>的方法，这样，分发到这个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或者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">{</div><div class="line"> NSString *newURL = url;</div><div class="line"> if ([url hasPrefix:@"//"]) {</div><div class="line"> newURL = [NSString stringWithFormat:@"http:%@", url];</div><div class="line"> } else if (![url hasPrefix:@"http"]) {</div><div class="line"> newURL = [NSURL URLWithString:url relativeToURL:weexInstance.scriptURL].absoluteString;</div><div class="line"> }</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(@{@"result":@"success"});</div><div class="line">}</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" class="article-heading"><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><a class="article-anchor" href="#暴露同步方法v0-10" aria-hidden="true"></a></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">{</div><div class="line"> return @"testString";</div><div class="line">}</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" class="article-heading"><a href="#注册-module" class="headerlink" title="注册 module"></a>注册 module<a class="article-anchor" href="#注册-module" aria-hidden="true"></a></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:@"event" withClass:[WXEventModule class]];</div></pre></td></tr></table></figure>
-<h3 id="使用自己的-module" class="article-heading"><a href="#使用自己的-module" class="headerlink" title="使用自己的 module"></a>使用自己的 module<a class="article-anchor" href="#使用自己的-module" aria-hidden="true"></a></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>{ </div><div class="line"> nativeLog(ret);</div><div class="line">});</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" class="article-heading"><a href="#WXImgLoaderProtocol" class="headerlink" title="WXImgLoaderProtocol"></a>WXImgLoaderProtocol<a class="article-anchor" href="#WXImgLoaderProtocol" aria-hidden="true"></a></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 <WXModuleProtocol></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<WXImageOperationProtocol>)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<WXImageOperationProtocol>)downloadImageWithURL:(NSString *)url imageFrame:(CGRect)imageFrame userInfo:(NSDictionary *)userInfo completed:(void(^)(UIImage *image, NSError *error, BOOL finished))completedBlock</div><div class="line">{</div><div class="line"> if ([url hasPrefix:@"//"]) {</div><div class="line"> url = [@"http:" stringByAppendingString:url];</div><div class="line"> }</div><div class="line"> return (id<WXImageOperationProtocol>)[[SDWebImageManager sharedManager] downloadImageWithURL:[NSURL URLWithString:url] options:0 progress:^(NSInteger receivedSize, NSInteger expectedSize) { </div><div class="line"> } completed:^(UIImage *ima
ge, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {</div><div class="line"> if (completedBlock) {</div><div class="line"> completedBlock(image, error, finished);</div><div class="line"> }</div><div class="line"> }];</div><div class="line">}</div><div class="line">@end</div></pre></td></tr></table></figure>
-<h3 id="handler注册" class="article-heading"><a href="#handler注册" class="headerlink" title="handler注册"></a>handler注册<a class="article-anchor" href="#handler注册" aria-hidden="true"></a></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" class="article-heading"><a href="#Components-扩展" class="headerlink" title="Components 扩展"></a>Components 扩展<a class="article-anchor" href="#Components-扩展" aria-hidden="true"></a></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" class="article-heading"><a href="#注册-Component" class="headerlink" title="注册 Component"></a>注册 Component<a class="article-anchor" href="#注册-Component" aria-hidden="true"></a></h3><p>注册一个 component 比较简单，调用 <code>WXSDKEngine</code> 中的 <code>registerComponent:withClass:</code> 方法，传入组件的标签名称，还有对应的 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><image></image></code></p>
-<h3 id="添加属性" class="article-heading"><a href="#添加属性" class="headerlink" title="添加属性"></a>添加属性<a class="article-anchor" href="#添加属性" aria-hidden="true"></a></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（可以配置的有 <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">{</div><div class="line"> if (self = [super initWithRef:ref type:type styles:styles attributes:attributes events:events weexInstance:weexInstance]) {</div><div class="line"> _imageSrc = [WXConvert NSString:attributes[@"src"]];</div><div class="line"> _resizeMode = [WXConvert UIViewContentMode:attributes[@"resize"]];</div><div class="line">}</div><div class="line"></div><div class="line"> return self;</div><div class="line">}</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" class="article-heading"><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<a class="article-anchor" href="#Hooking-渲染生命周期" aria-hidden="true"></a></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">{</div><div class="line">return [[WXImageView alloc] init];</div><div class="line">}</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">{</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">}</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">{</div><div class="line"> if (attributes[@"src"]) {</div><div class="line"> _imageSrc = [WXConvert NSString:attributes[@"src"]];</div><div class="line"> // Do your image updating logic</div><div class="line"> }</div><div class="line"></div><div class="line"> if (attributes[@"resize"]) {</div><div class="line"> _resizeMode = [WXConvert UIViewContentMode:attributes[@"resize"]];</div><div class="line"> self.view.contentMode = _resizeMode;</div><div class="line"> }</div><div class="line">}</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><image></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"><<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>></span><span class="tag"></<span class="name">image</span>></span></div></pre></td></tr></table></figure>
-<h5 id="component-方法" class="article-heading"><a href="#component-方法" class="headerlink" title="component 方法"></a>component 方法<a class="article-anchor" href="#component-方法" aria-hidden="true"></a></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">{</div><div class="line"> if (self = [super initWithRef:ref type:type styles:styles attributes:attributes events:events weexInstance:weexInstance]) {</div><div class="line"> // handle your attributes</div><div class="line"> // handle your styles</div><div class="line"> }</div><div class="line"> </div><div class="line"> return self;</div><div class="line">}</div><div class="line"></div><div class="line">- (void)focus</div><div class="line">{</div><div class="line"> NSLog(@"you got it");
</div><div class="line">}</div><div class="line">@end</div></pre></td></tr></table></figure>
-</li>
-<li><p>注册组件 <code>[WXSDKEngine registerComponent:@"mycomponent" 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"><<span class="name">template</span>></span></div><div class="line"> <span class="tag"><<span class="name">mycomponent</span> <span class="attr">id</span>=<span class="string">'mycomponent'</span>></span><span class="tag"></<span class="name">mycomponent</span>></span></div><div class="line"><span class="tag"></<span class="name">template</span>></span></div><div class="line"><span class="tag"><<span class="name">script</span>></span><span class="javascript"></span></div><div class="line"> <span class="built_in">module</span>.exports = {</div><div class="line"> <span class="attr">created</span>:<span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>{</div><div class="line"> <span class="keyword">this</span>.$el(<span class="string">'mycomponent'</span>).focus();</div><div class="line"> }
;</div><div class="line"> }</div><div class="line"><span class="tag"></<span class="name">script</span>></span></div></pre></td></tr></table></figure>
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