userContentController 从未从 JS 注入中回调

Question

我已经把 WBWebview 运行变成了 NSPopover.
我遵循了 this 指南，以便能够将数据从 JS 发送回我的 Swift 应用程序。不幸的是，userContentController 从未在 Swift 应用程序中被调用。这是我的 Swift 应用视图控制器代码：

class GSViewController: NSViewController, WKScriptMessageHandler, WKNavigationDelegate {

    var webView: WKWebView?

    var webConfig:WKWebViewConfiguration {
        get {

            // Create WKWebViewConfiguration instance
            let webCfg:WKWebViewConfiguration = WKWebViewConfiguration()

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

            // Add a script message handler for receiving  "buttonClicked" event notifications posted from the JS document using window.webkit.messageHandlers.buttonClicked.postMessage script message
            userController.addScriptMessageHandler(self, name: "buttonClicked")

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

            // Specify when and where and what user script needs to be injected into the web document
            let 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;

            return webCfg;
        }
    }

    override func loadView() {
        super.loadView()
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        self.webView = WKWebView(frame: self.view.frame, configuration: webConfig)
        self.webView!.navigationDelegate = self
        self.view = webView!

        let username = NSUserName()
        let url = NSURL(string:"someUrl")
        let req = NSURLRequest(URL:url!)
        self.webView!.loadRequest(req)
        self.view.frame = CGRectMake(0, 0, 440, 600)
     }

    func buttonClickEventTriggeredScriptToAddToDocument() ->String{
        let script:String = "webkit.messageHandlers.callbackHandler.postMessage('Does it works?');"
        return script;

    }

    // WKNavigationDelegate
    func webView(webView: WKWebView, didFinishNavigation navigation: WKNavigation!) {
        NSLog("%s", #function)
    }

    func webView(webView: WKWebView, didFailNavigation navigation: WKNavigation!, withError error: NSError) {
        NSLog("%s. With Error %@", #function, error)
        showAlertWithMessage("Failed to load file with error \(error.localizedDescription)!")
    }

    func userContentController(userContentController: WKUserContentController, didReceiveScriptMessage message: WKScriptMessage) {
        print("called")
        if(message.name == "callbackHandler") {
            print("It does ! \(message.body)")
        }
    }

    // Helper
    func showAlertWithMessage(message:String) {
        let myPopup:NSAlert = NSAlert()
        myPopup.messageText = message
        myPopup.alertStyle = NSAlertStyle.WarningAlertStyle
        myPopup.addButtonWithTitle("OK")
        myPopup.runModal()
    }

}

我正在尝试直接注入对 Swift 回调 webkit.messageHandlers.callbackHandler.postMessage('Does it works?'); 的调用，但它似乎不起作用。

通过不同的测试，我发现注入实际上以 Swift -> JS 方式工作（我已经能够修改可见 HTML 元素的 CSS通过注入 JQuery 代码），但是 JS -> Swift 桥似乎没有成功。有人知道为什么吗？

我在 OSX 10.11.6，运行 XCode 7.3.6.

总体而言，我对 Swift 和 OSX 编程是个新手，所以请毫不犹豫地指出我遗漏的任何元素。我自愿省略我的页面使用的 JS，因为我没有在示例中使用任何它。

谢谢。

Answer 1

找到了，完全是我的错。我在将脚本添加到 webview 配置时忘记重命名消息处理程序。

userController.addScriptMessageHandler(self, name: "callbackHandler") // was originally "ButtonClicked"

userContentController 从未从 JS 注入中回调

userContentController never called back from JS injection

javascript

macos

webkit

code-injection

swift