iOS WKWebView没有显示javascript alert（）对话框 [英] iOS WKWebView not showing javascript alert() dialog

问题描述

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。

I am having some trouble getting a WKWebView in iOS 8 to display an alert dialog that is called from Javascript. After creating a standard WKWebView and loading an HTML file, I have a button on the page that creates a simple alert with some text. This works in UIWebView and in Google Chrome/Safari, but does not appear to be working in WKWebView. Any help is appreciated.

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：

The html has the following function:

<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？我应该使用其中一个WK代表来控制警报/确认对话框的行为吗？谢谢。

This setup works in UIWebView and in regular browsers, but does not work in WKWebView. Am I missing something in the configuration? Should I be using one of the WK delegates to control the alert/confirm dialog behavior? Thank you.

推荐答案

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）。

To solve this you need a WKUIDelegate for your web view. It is the duty of the delegate to decide if an alert should be displayed, and in what way. You need to implement this for alert, confirm and text input (prompt).

以下是没有验证页面网址或安全功能的示例代码：

Here is sample code without any validation of the page url or security features:

- (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:^{}];
}

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