首先，设置html字符串：

var playerURL = """"
    https://w.soundcloud.com/player/?url=https%3A//api.soundcloud.com/tracks/\(trackId)%3Fsecret_token%3D\(secretToken)&auto_play=false&hide_related=true&show_comments=false&show_user=false&show_reposts=false&show_teaser=false&visual=false
"""

其次，创建WKWebView并对其进行配置

private var webView: WKWebView?

override func awakeFromNib() {
    super.awakeFromNib()

    ...(1)...

    self.webView?.navigationDelegate = self
    self.webView?.isUserInteractionEnabled = true
    self.webView?.scrollView.isScrollEnabled = false
    self.webView?.allowsLinkPreview  = false
    self.webView?.contentMode = .scaleAspectFit
    self.webView?.loadHTMLString(self.playerUrl, baseURL: nil)

    DispatchQueue.main.async {
        self.webView = WKWebView(frame: self.viewSoundclound.bounds, configuration: config)
        guard let webView = self.webView else { return }
        self.viewSoundclound.addSubview(webView)
    }
}

第三，设置要添加到WKWebView的JavasScript脚本的配置

override func awakeFromNib() {
    super.awakeFromNib()
    let config = WKWebViewConfiguration()
    let script = WKUserScript(source: self.eventListenerScript, injectionTime: .atDocumentEnd, forMainFrameOnly: false)
    config.userContentController.addUserScript(script)
    config.userContentController.add(self, name: "soundCloundEvents")

    ...(2)...
}

之后，创建您的脚本。重要：“messageHandler.（name）.postMessage”中名称必须等于此行中的名称：

'config.userContentController.add(self, name: "soundCloundEvents")'

private var eventListenerScript = """
    var iframe = document.querySelector('iframe');
    widget = SC.Widget(iframe);
    widget.bind(SC.Widget.Events.PLAY, function() {
        window.webkit.messageHandlers.soundCloundEvents.postMessage('PLAY');
    });
    widget.bind(SC.Widget.Events.FINISH, function() {
        window.webkit.messageHandlers.soundCloundEvents.postMessage('FINISH');
    });
"""

最后，扩展Controller或Cell（本例）以侦听脚本

extension PodcastsListTableViewCell: WKScriptMessageHandler {
func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
    print(message)
   }
}

根据@亚历克斯·佩尔蒂埃的回答，这对我很有帮助，下面是我的问题的解决方案。
在我的“loadView（）”函数中，我有以下内容：

let contentController = WKUserContentController();
contentController.addScriptMessageHandler(
    self,
    name: "callbackHandler"
)

let config = WKWebViewConfiguration()
config.userContentController = contentController

webView = WKWebView(frame: CGRectZero, configuration: config)
webView.navigationDelegate = self
view = webView

我的函数处理发送到Swift的Javascript事件：

func userContentController(userContentController: WKUserContentController, didReceiveScriptMessage message: WKScriptMessage)
    {
        if(message.name == "callbackHandler") {
            print("Launch my Native Camera")
        }
    }

......最后，我的Javascript（jQuery）代码，当点击我的相机按钮时（HTML格式）：

$(document).ready(function() {

    function callNativeApp () {
        try {
            webkit.messageHandlers.callbackHandler.postMessage("camera");
        } catch(err) {
            console.log('The native context does not exist yet');
        }
    }

    $(".menu-camera-icon").click(function() {
        callNativeApp();
    });
});

我希望它能帮助其他人：-）！

首先我们创建一个js文件。在js中，当你点击一个元素时，你可以发送一条消息，如下所示：

varmessageToPost = {'ButtonId':'clickMeButton'};
window.webkit.messageHandlers.buttonClicked.postMessage(messageToPost);

创建js文件和wkwebview之后，需要注入脚本：

// Setup WKUserContentController instance for injecting user script
  var userController:WKUserContentController= WKUserContentController()

  // Get script that's to be injected into the document
  let js:String= GetScriptFromResources()

  // Specify when and where and what user script needs to be injected into the web document
  var userScript:WKUserScript =  WKUserScript(source: js,
                                         injectionTime: WKUserScriptInjectionTime.AtDocumentEnd
                                         forMainFrameOnly: false)

  // Add the user script to the WKUserContentController instance
  userController.addUserScript(userScript)

  // Configure the WKWebViewConfiguration instance with the WKUserContentController
  webCfg.userContentController= userController;

  //set the message handler
  userController.addScriptMessageHandler(self, name: "buttonClicked")

最后你必须添加监听器函数：

func userContentController(userContentController: WKUserContentController,
                           didReceiveScriptMessage message: WKScriptMessage) {

        if let messageBody:NSDictionary= message.body as? NSDictionary{
            // Do stuff with messageBody
        }

    }

Source Code