iOS WKWebView没有显示javascript alert()对话框

Question

我在iOS 8中获取WKWebView以显示从Javascript调用的警报对话框时遇到一些麻烦.在创建标准WKWebView并加载HTML文件后,我在页面上有一个按钮,用于创建带有一些文本的简单警报.这适用于UIWebView和Google Chrome/Safari,但似乎无法在WKWebView中使用.任何帮助表示赞赏.

我的设置如下:

WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
config.allowsInlineMediaPlayback = YES;
config.mediaPlaybackRequiresUserAction = false;
_wkViewWeb = [[WKWebView alloc] initWithFrame:_viewWeb.frame config];
_wkViewWeb.scrollView.scrollEnabled = NO;
NSString *fullURL = @"file://.../TestSlide.html";
NSURL *url = [NSURL URLWithString:fullURL];
NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:10];

[_wkViewWeb loadRequest:request];

html具有以下功能:

<SCRIPT Language="JavaScript">
function alertTest() {
    alert("Testing Alerts");
}
</SCRIPT>

还有一个按钮:

<b>Test Alerts: <input type="button" value="Alert Popup" onclick="alertTest()"><br></b> <br>

此设置适用于UIWebView和常规浏览器,但在WKWebView中不起作用.我在配置中遗漏了什么吗？我是否应该使用其中一个WK代表来控制警报/确认对话框行为？谢谢.

Answer 1

要解决此问题,您需要一个WKUIDelegate用于您的Web视图.代表有责任决定是否应该以何种方式显示警报.您需要实现此警报,确认和文本输入(提示).

以下是未对页面网址或安全功能进行任何验证的示例代码:

- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler
{
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:message
                                                                             message:nil
                                                                      preferredStyle:UIAlertControllerStyleAlert];
    [alertController addAction:[UIAlertAction actionWithTitle:@"OK"
                                                        style:UIAlertActionStyleCancel
                                                      handler:^(UIAlertAction *action) {
                                                          completionHandler();
                                                      }]];
    [self presentViewController:alertController animated:YES completion:^{}];
}

更多在官方文档中

Answer 2

Swift 3实现了所有3个可选功能:

func webView(_ webView: WKWebView, runJavaScriptAlertPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo,
             completionHandler: @escaping () -> Void) {

    let alertController = UIAlertController(title: nil, message: message, preferredStyle: .actionSheet)
    alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action) in
        completionHandler()
    }))

    present(alertController, animated: true, completion: nil)
}


func webView(_ webView: WKWebView, runJavaScriptConfirmPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo,
             completionHandler: @escaping (Bool) -> Void) {

    let alertController = UIAlertController(title: nil, message: message, preferredStyle: .actionSheet)

    alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action) in
        completionHandler(true)
    }))

    alertController.addAction(UIAlertAction(title: "Cancel", style: .default, handler: { (action) in
        completionHandler(false)
    }))

    present(alertController, animated: true, completion: nil)
}


func webView(_ webView: WKWebView, runJavaScriptTextInputPanelWithPrompt prompt: String, defaultText: String?, initiatedByFrame frame: WKFrameInfo,
             completionHandler: @escaping (String?) -> Void) {

    let alertController = UIAlertController(title: nil, message: prompt, preferredStyle: .actionSheet)

    alertController.addTextField { (textField) in
        textField.text = defaultText
    }

    alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action) in
        if let text = alertController.textFields?.first?.text {
            completionHandler(text)
        } else {
            completionHandler(defaultText)
        }
    }))

    alertController.addAction(UIAlertAction(title: "Cancel", style: .default, handler: { (action) in
        completionHandler(nil)
    }))

    present(alertController, animated: true, completion: nil)
}

Answer 3

只是扩展一下,WKWebView需要您自己显示警报,提示和确认.这样做成为WKUIDelegate:

#import <WebKit/WebKit.h>
@interface MyController : UIViewController<WKUIDelegate>

然后分配代表:

web.UIDelegate = self;

然后,您需要实际实现警报,提示和确认.我创建WKWebViewPanelManager.h/m作为一个简单的实现,所以这就是我的工作:

- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler {
    [WKWebViewPanelManager presentAlertOnController:self.view.window.rootViewController title:@"Alert" message:message handler:completionHandler];
}

- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler {
    [WKWebViewPanelManager presentConfirmOnController:self.view.window.rootViewController title:@"Confirm" message:message handler:completionHandler];
}

- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * __nullable result))completionHandler {
    [WKWebViewPanelManager presentPromptOnController:self.view.window.rootViewController title:@"Prompt" message:prompt defaultText:defaultText handler:completionHandler];
}

当然,由您来筛选出错误的警报/确认/提示请求.

Answer 4

这是快速的

func webView(webView: WKWebView, runJavaScriptAlertPanelWithMessage message: String,
             initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping () -> Void) {

    let alertController = UIAlertController(title: message,
                                            message: nil,
                                            preferredStyle: .alert)

    alertController.addAction(UIAlertAction(title: "OK", style: .cancel) {
        _ in completionHandler()}
    )

    self.present(alertController, animated: true, completion: nil)
}

Answer 5

1. 将协议实现到您的 WKWebview 容器控制器。WKUID代表

2. 向WKWebview添加首选项以在viewDidLoad() 中启用 javascript 。

   // enable JS
   webView.configuration.preferences.javaScriptEnabled = true
   

3. 在viewDidLoad() 中注册WKWebview UI 委托为

   self.webView.uiDelegate = self
   

4. 在您的班级中实现以下委托。

   func webView(_ webView: WKWebView, runJavaScriptAlertPanelWithMessage message: 
   String, initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping () -> 
   Void) {
   let alertController = UIAlertController(title: message,message: nil,preferredStyle: 
   .alert)
   
   alertController.addAction(UIAlertAction(title: "OK", style: .cancel) {_ in 
   completionHandler()})
   
   self.present(alertController, animated: true, completion: nil)
   }
   

Answer 6

这是Swift 4.2 中的代码

func webView(_ webView: WKWebView, runJavaScriptAlertPanelWithMessage message: String,
             initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping () -> Void) {

    let alertController = UIAlertController(title: message, message: nil,
                                            preferredStyle: UIAlertController.Style.alert);

    alertController.addAction(UIAlertAction(title: "OK", style: UIAlertAction.Style.cancel) {
        _ in completionHandler()}
    );

    self.present(alertController, animated: true, completion: {});
}