WKWebView不显示提示框(Swift)

使用WKWebView的时候会出现明明本身作的一些页面有提示框, 为何使用别人的页面提示框老是不显示, 其实很大部分缘由是由于该提示框是经过JS调用的, 须要实现WKUIDelegate来进行监听

// MARK: - WKUIDelegate
    
    // 监听经过JS调用警告框
    func webView(_ webView: WKWebView, runJavaScriptAlertPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping () -> Void) {
        let alert = UIAlertController(title: nil, message: message, preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action) in
            completionHandler()
        }))
        self.present(alert, animated: true, completion: nil)
    }
    
    // 监听经过JS调用提示框
    func webView(_ webView: WKWebView, runJavaScriptConfirmPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping (Bool) -> Void) {
        let alert = UIAlertController(title: nil, message: message, preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action) in
            completionHandler(true)
        }))
        alert.addAction(UIAlertAction(title: "Cancel", style: .default, handler: { (action) in
            completionHandler(false)
        }))
        self.present(alert, animated: true, completion: nil)
    }
    
    // 监听JS调用输入框
    func webView(_ webView: WKWebView, runJavaScriptTextInputPanelWithPrompt prompt: String, defaultText: String?, initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping (String?) -> Void) {
        // 相似上面两个方法
    }

　　这里须要注意, completionHandler必定要调用, 不然会出错!