h5向iOS传值（JSCore）

h5：

参考juejin.cn/post/691674…

Swift：

1.继承WKScriptMessageHandler 实现 func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {} 方法，获取信息为message.body

2.启用js，添加ScriptMessageHandler

override func viewWillAppear(_ animated: Bool) {

        super.viewWillAppear(animated)

        //接收h5信息，scan为h5的方法名,页面消失时须移除！！不然会循环引用

        webView.configuration.preferences.javaScriptEnabled = **true**

        webView.configuration.userContentController.add(**self**, name: "scan")

    }

3.页面消失时移除ScriptMessageHandler

override func viewWillDisappear(_ animated: Bool) {

        super.viewWillDisappear(animated)

        webView.configuration.userContentController.removeScriptMessageHandler(forName: "scan")

    }