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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">指南</a></div><div class="nav-item"><a href="/zh/docs/" class="nav-link router-link-active">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="/docs/api/ios-apis.html" class="nav-link">English</a></li><li class="dropdown-item"><!----><a href="/zh/docs/api/ios-apis.html" class="nav-link router-link-exact-active 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class="dropdown-item"><!----><a href="/docs/api/ios-apis.html" class="nav-link">English</a></li><li class="dropdown-item"><!----><a href="/zh/docs/api/ios-apis.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 open"><span>API</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/docs/api/weex-variable.html" class="sidebar-link">Weex 环境变量</a></li><li><a href="/zh/docs/api/android-apis.html" class="sidebar-link">Android 接口</a></li><li><a href="/zh/docs/api/ios-apis.html" class="active sidebar-link">iOS 接口</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/zh/docs/api/ios-apis.html#native-对外接口" class="sidebar-link">Native 对外接口</a></li><li class="sidebar-sub-header"><a href="/zh/docs/api/ios-apis.html#handler-对应于-android-的-adapter-介绍" class="sidebar-link">Handler (对应于 Android 的 Adapter) 介绍</a></li><li class="sidebar-sub-header"><a href="/zh/docs/api/ios-apis.html#native-和-js-通信" class="sidebar-link">Native 和 JS 通信</a></li><li class="sidebar-sub-header"><a href="/zh/docs/api/ios-apis.html#动态适配容器" class="sidebar-link">动态适配容器</a></li><li class="sidebar-sub-header"><a href="/zh/docs/api/ios-apis.html#降级使用" class="sidebar-link">降级使用</a></li></ul></li><li><a href="/zh/docs/api/js-service.html" class="sidebar-link">JS 服务</a></li><li><a href="/zh/docs/api/broadcast-channel.html" class="sidebar-link">跨页面通信</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>内置组件</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/docs/components/a.html" class="sidebar-link">&lt;a&gt;</a></li><li><a href="/zh/docs/components/div.html" class="sidebar-link">&lt;div&gt;</a></li><li><a href="/zh/docs/components/text.html" class="sidebar-link">&lt;text&gt;</a></li><li><a href="/zh/docs/components/image.html" class="sidebar-link">&lt;image&gt;</a></li><li><a href="/zh/docs/components/list.html" class="sidebar-link">&lt;list&gt;</a></li><li><a href="/zh/docs/components/cell.html" class="sidebar-link">&lt;cell&gt;</a></li><li><a href="/zh/docs/components/loading.html" class="sidebar-link">&lt;loading&gt;</a></li><li><a href="/zh/docs/components/refresh.html" class="sidebar-link">&lt;refresh&gt;</a></li><li><a href="/zh/docs/components/recycle-list.html" class="sidebar-link">&lt;recycle-list&gt;</a></li><li><a href="/zh/docs/components/scroller.html" class="sidebar-link">&lt;scroller&gt;</a></li><li><a href="/zh/docs/components/slider.html" class="sidebar-link">&lt;slider&gt;</a></li><li><a href="/zh/docs/components/indicator.html" class="sidebar-link">&lt;indicator&gt;</a></li><li><a href="/zh/docs/components/textarea.html" class="sidebar-link">&lt;textarea&gt;</a></li><li><a href="/zh/docs/components/input.html" class="sidebar-link">&lt;input&gt;</a></li><li><a href="/zh/docs/components/waterfall.html" class="sidebar-link">&lt;waterfall&gt;</a></li><li><a href="/zh/docs/components/video.html" class="sidebar-link">&lt;video&gt;</a></li><li><a href="/zh/docs/components/web.html" class="sidebar-link">&lt;web&gt;</a></li><li><a href="/zh/docs/components/richtext.html" class="sidebar-link">&lt;richtext&gt;</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>内置模块</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/docs/modules/animation.html" class="sidebar-link">animation</a></li><li><a href="/zh/docs/modules/clipboard.html" class="sidebar-link">clipboard</a></li><li><a href="/zh/docs/modules/dom.html" class="sidebar-link">dom</a></li><li><a href="/zh/docs/modules/globalEvent.html" class="sidebar-link">globalEvent</a></li><li><a href="/zh/docs/modules/meta.html" class="sidebar-link">meta</a></li><li><a href="/zh/docs/modules/modal.html" class="sidebar-link">modal</a></li><li><a href="/zh/docs/modules/navigator.html" class="sidebar-link">navigator</a></li><li><a href="/zh/docs/modules/picker.html" class="sidebar-link">picker</a></li><li><a href="/zh/docs/modules/storage.html" class="sidebar-link">storage</a></li><li><a href="/zh/docs/modules/stream.html" class="sidebar-link">stream</a></li><li><a href="/zh/docs/modules/webview.html" class="sidebar-link">webview</a></li><li><a href="/zh/docs/modules/websockets.html" class="sidebar-link">webSockets</a></li><li><a href="/zh/docs/modules/deviceInfo.html" class="sidebar-link">deviceInfo</a></li><li><a href="/zh/docs/modules/console-log.html" class="sidebar-link">console-log</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>样式</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/docs/styles/common-styles.html" class="sidebar-link">通用样式</a></li><li><a href="/zh/docs/styles/text-styles.html" class="sidebar-link">文本样式</a></li><li><a href="/zh/docs/styles/css-units.html" class="sidebar-link">CSS 单位</a></li><li><a href="/zh/docs/styles/color-name.html" class="sidebar-link">颜色值</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>事件</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/docs/events/common-events.html" class="sidebar-link">通用事件</a></li><li><a href="/zh/docs/events/event-bubbling.html" class="sidebar-link">事件冒泡</a></li><li><a href="/zh/docs/events/gesture.html" class="sidebar-link">手势</a></li></ul></div></li></ul></div><div class="page"><div class="content"><h1 id="ios-apis"><a href="#ios-apis" class="header-anchor">#</a> iOS APIs</h1><h2 id="native-对外接口"><a href="#native-对外接口" class="header-anchor">#</a> Native 对外接口</h2><ul><li>注册 SDK 默认的 Module、Handler 和 Component</li><li>注册自定义 module、Handler 和 Component</li><li>重置 JSFramework</li></ul><h2 id="handler-对应于-android-的-adapter-介绍"><a href="#handler-对应于-android-的-adapter-介绍" class="header-anchor">#</a> Handler (对应于 Android 的 Adapter) 介绍</h2><ul><li><p><code>WXImgLoaderDefaultImpl</code> 图片下载 handler。Weex 会把需要设置图片的 View 和 URL 透露出来，Native 端需要实现这个接口进行图片下载。WeexSDK kernel 本身没有提供图片下载的默认实现。</p><p>接口定义如下：</p><div class="language-object-c extra-class"><pre class="language-text"><code>  @protocol WXImgLoaderProtocol &lt;WXModuleProtocol&gt;
/**
  * @abstract Creates a image download handler with a given URL
  *
  * @param imageUrl The URL of the image to download
  *
  * @param imageFrame  The frame of the image you want to set
  *
  * @param options : The options to be used for this download
  *
  * @param completedBlock : A block called once the download is completed.
  *                 image : the image which has been download to local.
  *                 error : the error which has happened in download.
  *              finished : a Boolean value indicating whether download action has finished.
  */
- (id&lt;WXImageOperationProtocol&gt;)downloadImageWithURL:(NSString *)url imageFrame:(CGRect)imageFrame userInfo:(NSDictionary *)options completed:(void(^)(UIImage *image,  NSError *error, BOOL finished))completedBlock;
@end
</code></pre></div></li></ul><h2 id="native-和-js-通信"><a href="#native-和-js-通信" class="header-anchor">#</a> Native 和 JS 通信</h2><ul><li><p>自定义通知事件</p><p>用于 native 自定义部分和 js 进行实践通知，比如传递下拉事件到 js，这个是在 component 基类的方法，可以直接使用</p><div class="language- extra-class"><pre class="language-text"><code>/**
  * @abstract Fire an event to the component and tell Javascript which value has been changed.
  * @param eventName 事件名称，可以在weex文件某个标签组件监听，命名规范为 onXXX
  * @param params 数据
  * @param domChanges 发生改变的数据
  **/
- (void)fireEvent:(NSString *)eventName params:(NSDictionary *)params domChanges:(NSDictionary *)domChanges
</code></pre></div></li><li><p>事件回调</p><p>多用于 Module 回调结果给 js，回调类型分为下面两种：</p><ol><li><p><code>WXModuleCallback</code> 为了性能考虑，该回调只能回调通知js一次，之后会被释放，多用于一次结果</p></li><li><p><code>WXModuleKeepAliveCallback</code> 该回调可以设置是否为多次回调类型，多次回调的场景如持续监听位置的变化，并返回给 js。</p></li></ol><div class="language- extra-class"><pre class="language-text"><code>@implementation WXEchoModule
@synthesize weexInstance; // 让该module 获得当前instance
WX_EXPORT_METHOD(@selector(echo:))
- (void)echo:(NSString *)param callback:(WXModuleKeepAliveCallback)callback
{
  callback(param,ture);// 此处设置true，该回调function 可以多次回调执行，可以写循环测试.
}
</code></pre></div></li></ul><h2 id="动态适配容器"><a href="#动态适配容器" class="header-anchor">#</a> 动态适配容器</h2><p>WeexSDK 在 <code>WXSDKInstance</code> 类中提供了方法 <code>setFrame(CGRect)</code> 来改变容器的大小。</p><p>如：在导航栏从有到无过程，需要 weexView 的变化， 可以在此时 native 调用该方法设置</p><h2 id="降级使用"><a href="#降级使用" class="header-anchor">#</a> 降级使用</h2><p>Weex 处于发展阶段会增加一些新的特性和功能，但是这些新的特性和功能都必须升级 SDK 才能实现，对于没有升级的应用应该怎么处理呢？可以使用降级功能。</p><p>所谓降级功能就是 Weex 无法运行的版本或者手机，可以用 Weex h5 来代替。</p><p>Native 端可以通过接口 WXSDKInstance 中的 onFailed 回调进行处理，如果是主动降级则返回的错误 domain 为 <code>TemplateErrorType</code>，Native 端可以跳转到对应的 H5 页面，或者用其他的方式提示用户当前环境不支持 Weex。</p></div><div class="page-nav"><p class="inner"><span class="prev">
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      </span></p></div><div class="page-edit"><div class="last-updated"><span class="prefix">上次更新: </span><span class="time">2020/12/10</span></div><div class="edit-link"><a href="https://github.com/apache/incubator-weex-site/edit/master/docs/zh/docs/api/ios-apis.md" target="_blank" rel="noopener noreferrer">编辑此页</a><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><a href="https://github.com/apache/incubator-weex-site/issues/new?body=https%3A%2F%2Fweex.io%2F" target="_blank" rel="noopener noreferrer" class="issueText">提交建议</a><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></div><div class="score"><span class="choice"><img src="https://img.alicdn.com/tfs/TB1h7TSqpYqK1RjSZLeXXbXppXa-20-18.svg" class="score-icon">文档写得很棒</span><span class="choice"><img src="https://img.alicdn.com/tfs/TB1h7TSqpYqK1RjSZLeXXbXppXa-20-18.svg" class="score-icon bad">文档写得很差</span></div></div><div class="license-wrap" style="display:none;"><footer class="footer-container" data-v-0ad13d84><div class="footer-body" data-v-0ad13d84><img src="/logo@2x.svg" class="logo" data-v-0ad13d84><img src="//img.alicdn.com/tfs/TB11BRiIW6qK1RjSZFmXXX0PFXa-365-365.png" class="apache" data-v-0ad13d84><div class="cols-container" data-v-0ad13d84><div class="col col-12" data-v-0ad13d84><h3 data-v-0ad13d84>Disclaimer</h3><p data-v-0ad13d84>Apache Weex is an effort undergoing incubation at The Apache Software Foundation (ASF), sponsored by the
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