native 端
初始化 wkwebview，设置 message handler
webView = WKWebView.init()let usecc = self.webView.configuration.userContentControllerusecc.add(self, name: "testecho")实现
WKScriptMessageHandler协议extension ViewController: WKScriptMessageHandler { ???func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) { ???????mylog("\(self.sendCount) call native , message is \(message.name),") ???}}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
- demo
WKWebView 里 JS 和 native 通信的例子
原文地址：https://www.cnblogs.com/huahuahu/p/WKWebView-li-JS-he-native-tong-xin-de-li-zi.html