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| <div id="app" data-server-rendered="true"><div class="theme-container vuepress-theme-fast"><header class="navbar"><div class="sidebar-button"><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" role="img" viewBox="0 0 448 512" class="icon"><path fill="currentColor" d="M436 124H12c-6.627 0-12-5.373-12-12V80c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12z"></path></svg></div><a href="/zh/" class="home-link router-link-active"><img src="/logo@2x.svg" alt="WEEX" class="logo"></a><span class="version"><a href="/download/download.html" class="version-bg"><img src="/assets/img/version-bg.ab65ded9.svg" alt="v0.28"><span class="version-no">v0.28</span></a></span><div class="links"><form id="search-form" class="algolia-search-wrapper search-box"><input id="algolia-search-input" class="search-query"></form><nav class="nav-links can-hide"><div class="nav-item"><a href="/zh/guide/" class="nav-link router-link-active">指南</a></div><div class="nav-item"><a href="/zh/docs/" class="nav-link">文档</a></div><div class="nav-item"><a href="/zh/tools/" class="nav-link">第三方工具</a></div><div class="nav-item"><a href="/zh/download/" class="nav-link">下载</a></div><div class="nav-item"><a href="/zh/community/" class="nav-link">社区</a></div><div class="nav-item"><a href="/zh/blog/" class="nav-link">博客</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">选择语言</span><span class="arrow right"></span></a><ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----><a href="/guide/extend/extend-ios.html" class="nav-link">English</a></li><li class="dropdown-item"><!----><a href="/zh/guide/extend/extend-ios.html" class="nav-link router-link-exact-active router-link-active">简体中文</a></li></ul></div></div></nav><a href="https://github.com/apache/incubator-weex" target="_blank" rel="noopener noreferrer" class="repo-link"><img src="/assets/img/github.7cb484a9.svg" alt="github" class="github-icon"></a></div></header><div class="sidebar-mask"></div><div class="sidebar"><nav class="nav-links"><div class="nav-item"><a href="/zh/guide/" class="nav-link router-link-active">指南</a></div><div class="nav-item"><a href="/zh/docs/" class="nav-link">文档</a></div><div class="nav-item"><a href="/zh/tools/" class="nav-link">第三方工具</a></div><div class="nav-item"><a href="/zh/download/" class="nav-link">下载</a></div><div class="nav-item"><a href="/zh/community/" class="nav-link">社区</a></div><div class="nav-item"><a href="/zh/blog/" class="nav-link">博客</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">选择语言</span><span class="arrow right"></span></a><ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----><a href="/guide/extend/extend-ios.html" class="nav-link">English</a></li><li class="dropdown-item"><!----><a href="/zh/guide/extend/extend-ios.html" class="nav-link router-link-exact-active router-link-active">简体中文</a></li></ul></div></div></nav><ul class="sidebar-links"><li><div class="sidebar-group first"><p class="sidebar-heading"><span>快速上手</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/guide/introduction.html" class="sidebar-link">简介</a></li><li><a href="/zh/guide/front-end-frameworks.html" class="sidebar-link">前端框架</a></li><li><a href="/zh/guide/platform-difference.html" class="sidebar-link">平台差异</a></li><li><a href="/zh/guide/use-vue-in-weex.html" class="sidebar-link">在Weex中使用Vue.js</a></li><li><a href="/zh/guide/use-rax-in-weex.html" class="sidebar-link">在Weex中使用Rax.js</a></li><li><a href="/zh/guide/playground.html" class="sidebar-link">Playground 应用</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>开发</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/guide/develop/setup-develop-environment.html" class="sidebar-link">设置开发环境</a></li><li><a href="/zh/guide/develop/create-a-new-app.html" class="sidebar-link">创建一个新的app</a></li><li><a href="/zh/guide/develop/weex_cli.html" class="sidebar-link">Weex CLI</a></li><li><a href="/zh/guide/develop/integrate-to-android-app.html" class="sidebar-link">集成到Android应用</a></li><li><a href="/zh/guide/develop/integrate-to-iOS-app.html" class="sidebar-link">集成到iOS应用</a></li><li><a href="/zh/guide/develop/weex_error_code.html" class="sidebar-link">WEEX常见错误码</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>调试</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/guide/debug/integrate-devtool-to-android.html" class="sidebar-link">集成Devtool到Android</a></li><li><a href="/zh/guide/debug/integrate-devtool-to-ios.html" class="sidebar-link">集成Devtool到iOS</a></li><li><a href="/zh/guide/debug/debug.html" class="sidebar-link">调试</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading open"><span>扩展</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/guide/extend/extend-android.html" class="sidebar-link">扩展Android能力</a></li><li><a href="/zh/guide/extend/extend-ios.html" class="active sidebar-link">扩展iOS能力</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/zh/guide/extend/extend-ios.html#jsenv-扩展" class="sidebar-link">JSEnv 扩展</a></li><li class="sidebar-sub-header"><a href="/zh/guide/extend/extend-ios.html#自定义-module" class="sidebar-link">自定义 module</a></li><li class="sidebar-sub-header"><a href="/zh/guide/extend/extend-ios.html#扩展组件" class="sidebar-link">扩展组件</a></li><li class="sidebar-sub-header"><a href="/zh/guide/extend/extend-ios.html#获取组件的-css-样式" class="sidebar-link">获取组件的 CSS 样式</a></li><li class="sidebar-sub-header"><a href="/zh/guide/extend/extend-ios.html#自定义-handler" class="sidebar-link">自定义 handler</a></li></ul></li><li><a href="/zh/guide/extend/extend-ios-with-swift.html" class="sidebar-link">使用Swift扩展iOS能力</a></li><li><a href="/zh/guide/extend/extend-web.html" class="sidebar-link">扩展Web组件</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>高阶特性</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/guide/advanced/asset-path.html" class="sidebar-link">资源路径</a></li><li><a href="/zh/guide/advanced/downgrade.html" class="sidebar-link">降级方案</a></li><li><a href="/zh/guide/advanced/use-vuex-and-vue-router.html" class="sidebar-link">使用Vuex和vue-router</a></li><li><a href="/zh/guide/advanced/multi-size-screen.html" class="sidebar-link">适应不同尺寸屏幕</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>贡献</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/guide/contribute/how-to-contribute.html" class="sidebar-link">加入 Weex 社区</a></li><li><a href="/zh/guide/contribute/thanks.html" class="sidebar-link">鸣谢</a></li></ul></div></li></ul></div><div class="page"><div class="content"><blockquote><p>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。<br> |
| 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。否则将可能面临苹果上架审核问题。</p></blockquote><p>在这篇文档里，我们使用 Objective-C 来扩展 Weex 功能，如果想使用 Swift，可以参考 <a href="/zh/guide/extend/extend-ios-with-swift.html">使用 Swift 扩展</a>。</p><h2 id="jsenv-扩展"><a href="#jsenv-扩展" class="header-anchor">#</a> JSEnv 扩展</h2><h3 id="接口"><a href="#接口" class="header-anchor">#</a> 接口</h3><div class="language- extra-class"><pre class="language-text"><code>NSDictionary *options = @{@"testVlaue":@"hello"}; |
| |
| [_instance renderWithURL:url options:options data:nil]; |
| |
| </code></pre></div><h3 id="使用"><a href="#使用" class="header-anchor">#</a> 使用</h3><div class="language- extra-class"><pre class="language-text"><code>var value = weex.config.testValue; |
| |
| console.log(value); |
| </code></pre></div><h2 id="自定义-module"><a href="#自定义-module" class="header-anchor">#</a> 自定义 module</h2><p>自定义 module，需要让自己的 class 遵循 <code>WXModuleProtocol</code> 这个protocol，通过 <code>WX_EXPORT_METHOD</code> 这个宏暴露出需要透出到 <code>JavaScript</code> 调用的方法，再向 WeexSDK 注册 module，就可以完成一个简单 module 的自定义。</p><ol><li>新建一个基类为 NSObject 的 class <code>WXCustomEventModule</code>，让该类遵循 <code>WXModuleProtocol</code> 的协议。 |
| <img src="https://img.alicdn.com/tfs/TB1LrZ8n7voK1RjSZPfXXXPKFXa-1042-264.png" width="100%"></li><li>添加打印的方法，通过 <code>WX_EXPORT_METHOD</code> 暴露该方法。 |
| <img src="https://img.alicdn.com/tfs/TB156M9nZfpK1RjSZFOXXa6nFXa-1434-564.png" width="100%"></li><li>在初始化完成 Weex SDK 之后注册该 module。 |
| <img src="https://img.alicdn.com/tfs/TB1IGo4nVzqK1RjSZFoXXbfcXXa-1420-122.png" width="100%"></li></ol><p>到此，我们已经完成了一个简单的 module 方法的封装，在 JS 里使用方法如下：</p><div class="language-Javascript extra-class"><pre class="language-javascript"><code>weex<span class="token punctuation">.</span><span class="token function">requireModule</span><span class="token punctuation">(</span><span class="token string">"event"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">showParams</span><span class="token punctuation">(</span><span class="token string">"hello Weex"</span><span class="token punctuation">)</span> |
| </code></pre></div><h4 id="module-进阶"><a href="#module-进阶" class="header-anchor">#</a> Module 进阶</h4><p>关于 Module 和 Module 方法的执行特性（同步、异步；执行线程），需要了解：</p><ol><li><code>weexInstance</code><br> |
| 在一个 Weex 页面中，默认 WXSDKInstance 的实例持有多个 module 的实例, 而 Module 的实例是是没有对 WXSDKInstance 做持有的，在自定义的 module 中添加 <code>@synthesize weexInstance</code>，module 实例可以对持有它本身的 WXSDKInstance 实例做一个弱引用，通过 weexInstance 可以拿到调用该 module 的页面的一些信息。</li><li><code>targetExecuteThread</code><br> |
| Module 方法默认会在 UI 线程（iOS 主线程）中被调用，建议不要在这做太多耗时的任务。如果你的任务不需要在 UI 线程执行或需要在特定线程执行，需要实现 <code>WXModuleProtocol</code> 中的 <code>- (NSThread *)</code> 的方法，并返回你希望方法执行所在的线程。</li><li><code>WXModuleKeepAliveCallback</code><br> |
| Module 支持返回值给 JavaScript 中的回调，回调的类型是 <code>WXModuleKeepAliveCallback</code>。回调的参数可以是 <code>String</code> 或者 <code>Map</code>。该 block 第一个参数为回调给 JavaScript 的数据，第二参数是一个 BOOL 值，表示该回调执行完成之后是否要被清除。JavaScript 每次调用都会产生一个回调，但是对于单独一次调用，是否要在完成该调用之后清除掉回调函数 id 就由这个选项控制，如非特殊场景，建议传 NO。</li><li><code>WX_EXPORT_METHOD_SYNC</code><br> |
| 使用 <code>WX_EXPORT_METHOD</code> 暴露到前端的方法都是异步方法(获得结果需要通过回调函数获得)。如果期望获得同步调用结果，可以使用 <code>WX_EXPORT_METHOD_SYNC</code> 声明同步的 Module 方法。</li></ol><h2 id="扩展组件"><a href="#扩展组件" class="header-anchor">#</a> 扩展组件</h2><ol><li>新建一个基类为 <code>WXComponent</code> 的类。如果这个类里什么代码也不写，它和默认的的 <code>div</code> 组件能力是一致的。</li><li>覆盖 <code>WXComponent</code> 中的生命周期方法</li></ol><ul><li><code>loadView</code><br> |
| 一个组件默认对应于一个 view，如果未覆盖 <code>loadView</code> 提供自定义 view，会让 <code>WXComponent</code> 基类创建 <code>WXView</code>。<code>WXView</code> 继承自 <code>UIView</code>。比如我们要实现一个组件支持地图功能，我们可以返回系统的 <code>MKMapView</code>。</li></ul><div class="language-Objective-C extra-class"><pre class="language-text"><code>- (UIView *)loadView { |
| return [MKMapView new]; |
| } |
| </code></pre></div><ul><li><code>viewDidLoad</code> |
| 对组件 view 需要做一些配置，比如设置 delegate，可以在 <code>viewDidLoad</code> 生命周期做。如果当前 view 没有添加 subview 的话，不要设置 view 的 frame，WeexSDK 会根据 style 进行排版后设置。</li></ul><div class="language-Objective-C extra-class"><pre class="language-text"><code>- (void)viewDidLoad { |
| ((MKMapView*)self.view).delegate = self; |
| } |
| </code></pre></div><ol start="3"><li>注册组件</li></ol><div class="language-Objective-C extra-class"><pre class="language-text"><code>[WXSDKEngine registerComponent:@"map" withClass:[WXMapComponent class]]; |
| </code></pre></div><ol start="4"><li>在前端代码中使用新组件</li></ol><div class="language-Html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>template</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>div</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>map</span><span class="token style-attr language-css"><span class="token attr-name"> <span class="token attr-name">style</span></span><span class="token punctuation">="</span><span class="token attr-value"><span class="token property">width</span><span class="token punctuation">:</span>200px<span class="token punctuation">;</span><span class="token property">height</span><span class="token punctuation">:</span>200px</span><span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>map</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>div</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>template</span><span class="token punctuation">></span></span> |
| </code></pre></div><h4 id="自定义事件"><a href="#自定义事件" class="header-anchor">#</a> 自定义事件</h4><ol><li>对于每个组件，WeexSDK 默认提供了一些事件能力，如点击等。假如想给我们的地图组件提供 <code>mapLoaded</code> 事件。</li></ol><div class="language-Html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>template</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>div</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>map</span><span class="token style-attr language-css"><span class="token attr-name"> <span class="token attr-name">style</span></span><span class="token punctuation">="</span><span class="token attr-value"><span class="token property">width</span><span class="token punctuation">:</span>200px<span class="token punctuation">;</span><span class="token property">height</span><span class="token punctuation">:</span>200px</span><span class="token punctuation">"</span></span> <span class="token attr-name">@mapLoaded</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>onMapLoaded<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>map</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>div</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>template</span><span class="token punctuation">></span></span> |
| |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>script</span><span class="token punctuation">></span></span><span class="token script"><span class="token language-javascript"> |
| <span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token punctuation">{</span> |
| methods<span class="token punctuation">:</span> <span class="token punctuation">{</span> |
| <span class="token function-variable function">onMapLoaded</span><span class="token punctuation">:</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">e</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">"map loaded"</span><span class="token operator">+</span><span class="token constant">JSON</span><span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span><span class="token punctuation">)</span> |
| <span class="token punctuation">}</span> |
| <span class="token punctuation">}</span> |
| <span class="token punctuation">}</span> |
| </span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>script</span><span class="token punctuation">></span></span> |
| </code></pre></div><ol start="2"><li>覆盖组件生命周期方法，记录事件是否需要处理</li></ol><p>我们需要额外添加一个 <code>BOOL</code> 成员 <code>mapLoaded</code> 用来记录该事件是否生效。</p><div class="language-Objective-C extra-class"><pre class="language-text"><code>- (void)addEvent:(NSString *)eventName { |
| if ([eventName isEqualToString:@"mapLoaded"]) { |
| _mapLoaded = YES; |
| } |
| } |
| |
| - (void)removeEvent:(NSString *)eventName { |
| if ([eventName isEqualToString:@"mapLoaded"]) { |
| _mapLoaded = NO; |
| } |
| } |
| </code></pre></div><ol start="3"><li>给前端发送事件</li></ol><div class="language-Objective-C extra-class"><pre class="language-text"><code>- (void)mapViewDidFinishLoadingMap:(MKMapView *)mapView { |
| if (_mapLoaded) { |
| [self fireEvent:@"mapLoaded" params:@{@"customKey":@"customValue"} domChanges:nil]; |
| } |
| } |
| </code></pre></div><h4 id="自定义属性"><a href="#自定义属性" class="header-anchor">#</a> 自定义属性</h4><p>给我们的地图组件添加一个新的属性 <code>showTraffic</code>。在前端代码里可以控制组件是否显示车流情况。</p><div class="language-Html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>template</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>div</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>map</span><span class="token style-attr language-css"><span class="token attr-name"> <span class="token attr-name">style</span></span><span class="token punctuation">="</span><span class="token attr-value"><span class="token property">width</span><span class="token punctuation">:</span>200px<span class="token punctuation">;</span><span class="token property">height</span><span class="token punctuation">:</span>200px</span><span class="token punctuation">"</span></span> <span class="token attr-name">showTraffic</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>true<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>map</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>div</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>template</span><span class="token punctuation">></span></span> |
| </code></pre></div><ol><li>覆盖组件初始化方法 <code>initWithRef...</code> |
| 给组件添加一个成员变量记录 <code>showTraffic</code> 属性的值，并在 init 方法中初始化。</li></ol><div class="language-Objective-C extra-class"><pre class="language-text"><code>- (instancetype)initWithRef:(NSString *)ref type:(NSString *)type styles:(NSDictionary *)styles attributes:(NSDictionary *)attributes events:(NSArray *)events weexInstance:(WXSDKInstance *)weexInstance { |
| if(self = [super initWithRef:ref type:type styles:styles attributes:attributes events:events weexInstance:weexInstance]) { |
| if (attributes[@"showsTraffic"]) { |
| _showsTraffic = [WXConvert BOOL: attributes[@"showsTraffic"]]; |
| } |
| } |
| return self; |
| } |
| </code></pre></div><ol start="2"><li>在生命期事件中记得将属性值同步给地图控件</li></ol><div class="language-Objective-C extra-class"><pre class="language-text"><code>- (void)viewDidLoad { |
| ((MKMapView*)self.view).showsTraffic = _showsTraffic; |
| } |
| </code></pre></div><ol start="3"><li>当属性更新时，同步给地图控件</li></ol><div class="language-Objective-C extra-class"><pre class="language-text"><code>- (void)updateAttributes:(NSDictionary *)attributes { |
| if (attributes[@"showsTraffic"]) { |
| _showsTraffic = [WXConvert BOOL: attributes[@"showsTraffic"]]; |
| ((MKMapView*)self.view).showsTraffic = _showsTraffic; |
| } |
| } |
| </code></pre></div><h4 id="更多的组件生命期方法"><a href="#更多的组件生命期方法" class="header-anchor">#</a> 更多的组件生命期方法</h4><p>组件是由 Weex 管理的，比如创建、布局、渲染、销毁。Weex 组件的生命周期方法都是可以重写的，你可以在这些生命周期中去做自己的事情。</p><table><thead><tr><th>方法</th><th>描述</th></tr></thead><tbody><tr><td>initWithRef:type:…</td><td>用给定的属性初始化一个component.</td></tr><tr><td>layoutDidFinish</td><td>在component完成布局时候会调用.</td></tr><tr><td>loadView</td><td>创建component管理的view.</td></tr><tr><td>viewWillLoad</td><td>在component的view加载之前会调用.</td></tr><tr><td>viewDidLoad</td><td>在component的view加载完之后调用.</td></tr><tr><td>viewWillUnload</td><td>在component的view被释放之前调用.</td></tr><tr><td>viewDidUnload</td><td>在component的view被释放之后调用.</td></tr><tr><td>updateStyles:</td><td>在component的style更新时候调用.</td></tr><tr><td>updateAttributes:</td><td>在component的attribute更新时候调用.</td></tr><tr><td>addEvent:</td><td>给component添加event的时候调用.</td></tr><tr><td>removeEvent:</td><td>在event移除的时候调用.</td></tr></tbody></table><h4 id="给组件添加方法"><a href="#给组件添加方法" class="header-anchor">#</a> 给组件添加方法</h4><p>在组件代码中使用宏 <code>WX_EXPORT_METHOD</code> 声明组件方法供前端调用。</p><div class="language-Objective-C extra-class"><pre class="language-text"><code>@implementation WXMyComponent |
| |
| WX_EXPORT_METHOD(@selector(focus)) |
| |
| - (instancetype)initWithRef:(NSString *)ref type:(NSString *)type styles:(NSDictionary *)styles attributes:(NSDictionary *)attributes events:(NSArray *)events weexInstance:(WXSDKInstance *)weexInstance { |
| if (self = [super initWithRef:ref type:type styles:styles attributes:attributes events:events weexInstance:weexInstance]) { |
| // handle your attributes |
| // handle your styles |
| } |
| |
| return self; |
| } |
| |
| - (void)focus { |
| NSLog(@"you got it"); |
| } |
| @end |
| </code></pre></div><p>在 JS 中调用 <code>focus</code> 方法。</p><div class="language-Html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>template</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>mycomponent</span> <span class="token attr-name">ref</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">'</span>mycomponent<span class="token punctuation">'</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>mycomponent</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>template</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>script</span><span class="token punctuation">></span></span><span class="token script"><span class="token language-javascript"> |
| module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span> |
| <span class="token function-variable function">created</span><span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| <span class="token keyword">this</span><span class="token punctuation">.</span>$refs<span class="token punctuation">.</span>mycomponent<span class="token punctuation">.</span><span class="token function">focus</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| <span class="token punctuation">}</span> |
| </span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>script</span><span class="token punctuation">></span></span> |
| </code></pre></div><h2 id="获取组件的-css-样式"><a href="#获取组件的-css-样式" class="header-anchor">#</a> 获取组件的 CSS 样式</h2><ol><li>在 0.19 版本之前，Weex 使用 Yoga 排版引擎，可以通过访问 WXComponent 的 cssNode 属性获取。例如：</li></ol><div class="language-Objective-C extra-class"><pre class="language-text"><code>self.cssNode->style.flex = 1.0; |
| float height = self.cssNode->style.dimensions[CSS_HEIGHT]; |
| </code></pre></div><ol start="2"><li><p>从 0.19 版本开始，Weex 使用自已的排版引擎，是 C++ 代码。获取 CSS 属性可以从 WXComponent 的 styles 字典（NSDictionary）里获取，也可以访问 WXComponent 的 flexCssNode 属性，其类型为 C++ 类 WeexCore::WXCoreLayoutNode。注意，需要源文件为 .mm 类型。</p></li><li><p>从 0.20 版本开始，iOS 接入 WeexCore，排版引擎也沉入 WeexCore层，并且 CSS 相关属性不再上传给 WXComponent 对象，WXComponent 对象的 styles 字典里只有非 CSS 样式。我们的目的是上层 UI 组件只需要关心排版引擎生成的最终坐标即可，不需要关心前端标记的 CSS 属性。如果仍然需要获取 CSS 样式，可以在 .mm 文件中直接访问 flexCssNode，或通过 WXComponent+Layout.h 文件中提供的扩展方法。</p></li></ol><div class="language-Objective-C extra-class"><pre class="language-text"><code>/** |
| * @abstract Get css style value for key. The key should be of CSS standard form. |
| * This method is for convenience use in C/ObjC environment. And if you want to |
| * retrieve all style values or in C++, you could use flexCssNode directly. |
| * |
| * Thread usage: |
| * This method should be invoked in component thread by WXPerformBlockOnComponentThread. |
| * Note that all initWithRef methods of WXComponent and its subclasses are performed in |
| * component thread by default. Therefore you can call this method directly in initWithRef. |
| * |
| * Supported keys: |
| * width, height, min-width, min-height, max-width, max-height, |
| * margin-(left/right/top/bottom) |
| * padding-(left/right/top/bottom) |
| * border-(left/right/top/bottom)-width |
| * left, right, top, bottom |
| * flex-grow |
| */ |
| - (float)getCssStyleValueForKey:(NSString *)key; |
| |
| // Other methods which should also be used in component thread. |
| - (WXCoreFlexDirection)getCssStyleFlexDirection; |
| - (WXCoreFlexWrap)getCssStyleFlexWrap; |
| - (WXCoreJustifyContent)getCssStyleJustifyContent; |
| - (WXCoreAlignItems)getCssStyleAlignItems; |
| - (WXCoreAlignSelf)getCssStyleAlignSelf; |
| - (WXCorePositionType)getCssStylePositionType; |
| - (WXCoreDirection)getCssDirection; |
| </code></pre></div><h2 id="自定义-handler"><a href="#自定义-handler" class="header-anchor">#</a> 自定义 handler</h2><p>Handler 的作用是什么？比如 WeexSDK 目前没有提供图片下载的能力，而是在 <code>WXImgLoaderProtocol</code> 定义了一些获取图片的接口。Image 组件正是通过 <code>WXImgLoaderProtocol</code> 获得并展示图片，开发者可以实现该 protocol 中的接口方法，这样 <code>image</code> 标签才能正常展示图片。</p><p>开发者也可以定义自己的 <code>protocol</code> 和对应的实现来使用 <code>handler</code> 机制。常见的一个场景就是在每个 App 中需要特定的 Handler 来实现一些公共的能力。</p><ol><li>新建基类为 NSObject 的类，并实现 <code>WXImgLoaderProtocol</code> 协议，实现 <code>WXImgLoaderProtocol</code> 的方法。 |
| 下面加载图片的逻辑需要依赖 SDWebImage，你也可以不依赖 SDWebimage 使用自己的方式加载对应 URL 图片。</li></ol><div class="language-Objective-C extra-class"><pre class="language-text"><code>@implementation WXImgLoaderDefaultImpl |
| - (id<WXImageOperationProtocol>)downloadImageWithURL:(NSString *)url imageFrame:(CGRect)imageFrame userInfo:(NSDictionary *)userInfo completed:(void(^)(UIImage *image, NSError *error, BOOL finished))completedBlock { |
| if ([url hasPrefix:@"//"]) { |
| url = [@"http:" stringByAppendingString:url]; |
| } |
| return (id<WXImageOperationProtocol>)[[SDWebImageManager sharedManager] downloadImageWithURL:[NSURL URLWithString:url] options:0 progress:^(NSInteger receivedSize, NSInteger expectedSize) { |
| } completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) { |
| if (completedBlock) { |
| completedBlock(image, error, finished); |
| } |
| }]; |
| } |
| @end |
| </code></pre></div><ol start="2"><li>注册</li></ol><div class="language-Objective-C extra-class"><pre class="language-text"><code>[WXSDKEngine registerHandler:[WXImgLoaderDefaultImpl new] withProtocol:@protocol(WXImgLoaderProtocol)]; |
| </code></pre></div><ol start="3"><li>使用</li></ol><div class="language-Objective-C extra-class"><pre class="language-text"><code>id<WXImgLoaderProtocol> imageLoader = [WXSDKEngine handlerForProtocol:@protocol(WXImgLoaderProtocol)]; |
| [iamgeLoader downloadImageWithURL:imageURl imageFrame:frame userInfo:customParam completed:^(UIImage *image, NSError *error, BOOL finished) { |
| }]; |
| </code></pre></div></div><div class="page-nav"><p class="inner"><span class="prev"> |
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