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<h1 id="ios-开源库源码分析之webviewjavascriptbridge">iOS 开源库源码分析之WebViewJavascriptBridge</h1>
<h3 id="webviewjavascriptbridgejs">WebViewJavascriptBridge_JS</h3>
<p>WebViewJavascriptBridge_JS是需要注入JS的JS代码部分，主要是一个JS的WebViewJavascriptBridge对象，里面有registerHandler和callHandler方法。</p>
<p>这个代码会在JS载入的时候通过setupWebViewJavascriptBridge调用</p>
<h3 id="webviewjavascriptbridge">WebViewJavascriptBridge</h3>
<h4 id="objective-c调用js的方法">Objective-C调用JS的方法</h4>
<p>可以查看Base提供的</p>
<pre><code>_evaluateJavascript
</code></pre><p>在UIWebView的实现是通过stringByEvaluatingJavaScriptFromString方法来实现，在WKWebView中是调用evaluateJavaScript: completionHandler:。</p>
<p>这个方法在WebViewJavascriptBridge 和 WKWebViewJavascriptBridge 则通过callHandler方法来包装。</p>
<p>不过需要注意的是，在调用之前你要保证这个方法是有的，所以需要JS端先调用WebViewJavascriptBridge_JS的registerHandler来把方法和方法名作为keyvalue放入WebViewJavascriptBridge_JS的messageHandlers里面</p>
<h4 id="js调用objective-c">JS调用Objective-C</h4>
<p>JavaScript 能直接调用 native 方法吗？不可以。</p>
<p>首先JS端调用WebViewJavascriptBridge_JS的callHandler，这里会把方法键值对加入sendMessageQueue队列，并且赋值iframe的src</p>
<pre><code>https://__wvjb_queue_message__/
</code></pre><p>以便ObjC识别自定义的消息.</p>
<p>但是可以间接的通过一些方法来实现。可以利用 UIWebView 的delegate方法 webView: shouldStartLoadWithRequest: navigationType: 来做。 WKWebView 中可以通过的delegate 方法 webView: decidePolicyForNavigationAction: decisionHandler: 来做.</p>
<p>webView 发起的网络请求都会走上面的代理方法，那么就可以在代理里拦截，如果返回的是我们自己定义的 URL ，就不再加载网页，而是来处理一些我们想让它做的事情，从而实现 native 和 JavaScript 的交互。</p>
<p>在代理方法里面会通过webViewJavascriptFetchQueyCommand拉取消息队列,然后序列化消息后拿到对应的消息去调用messageHandlers里面对应的handler.</p>
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