WKWebView 里 JS 和 native 通信的例子

native 端

  1. 初始化 wkwebview，设置 message handler

    webView = WKWebView.init()
let usecc = self.webView.configuration.userContentController
usecc.add(self, name: "testecho")

  2. 实现 WKScriptMessageHandler协议

    extension ViewController: WKScriptMessageHandler {
    func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
        mylog("\(self.sendCount) call native , message is \(message.name),")
    }
}

  3. 执行JS 代码 

    //jsStr = "echo(\"wordword\")"
self.webView.evaluateJavaScript(jsStr) { (result, err) in
    self.mylog("\(self.sendCount) \(jsStr.count) bytes callback, result: \(result), err: \(err)")
}

    前端

    <!DOCTYPE html>
<html>
<script type="text/javascript">
    function echo(str) {
        console.log(str);
        window.webkit.messageHandlers.testecho.postMessage(str);
}
</script>
<body>
<input type="button" onClick="echo('toast clicked')" value="toast">
<input type="button" onClick="echo('alert clicked')" value="Alert">
</body>

</html>

分析

native 端注册了 testecho 的messageHandler，所以 JS 可以通过 window.webkit.messageHandlers.testecho.postMessage 来回调客户端，和文档中说的一样。

Adding a script message handler with name name causes the JavaScript function window.webkit.messageHandlers.name.postMessage(messageBody) to be defined in all frames in all web views that use the user content controller.

参考

posted on 2018-11-10 08:43  花老🐯  阅读(331)  评论(0)  编辑  收藏  举报

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