Question

我在iOS 8中使用WKWebView显示从Javascript调用的警告对话框时遇到了一些麻烦。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）。

以下是未经页面网址或安全功能验证的示例代码：

- (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:^{}];
}

Official Documentation

中的更多内容

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

只需展开一点，WKWebView要求您自己显示提醒，提示和确认。通过成为WKUIDelegate：

来做到这一点

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

然后分配代表：

web.UIDelegate = self;

然后你需要实际实现警报，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，您可以过滤掉不良警报/确认/提示请求。

Answer 4

这就是swift

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

    let alertController = UIAlertController(title: message, message: nil,
        preferredStyle: UIAlertControllerStyle.Alert);

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

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

Answer 5

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: {});
}

Answer 6

将协议实施到WKWebview容器控制器。 WKUIDelegate
向 WKWebview 添加首选项，以在 viewDidLoad（）中启用javascript。
```
// enable JS
webView.configuration.preferences.javaScriptEnabled = true
```
在 viewDidLoad（）中将 WKWebview 用户界面代理注册为
```
self.webView.uiDelegate = self
```

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)
}

iOS WKWebView没有显示javascript alert（）对话框

6 个答案: