5

I am using WKUIDelegate this function to handle javascript alert

-(void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler
{

    UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Test Alert", nil)
                                                     message:message
                                                    delegate:self
                                           cancelButtonTitle:nil
                                           otherButtonTitles:@"OK", nil] autorelease];

    [alert show];
    completionHandler();
}

According to Apple documentation we should call compeletionHandler() of an alert after OK button is pressed on alert as mentioned here

How to call completionHandler() after press OK button is pressed? If I don't call completionHandler() expection is thrown

**[WKWebViewController webView:runJavaScriptAlertPanelWithMessage:initiatedByFrame:
    completionHandler:]:
***** Terminating app due to uncaught exception 'NSInternalInconsistencyException',
   reason: 'Completion handler passed to -[WKWebViewController
   webView:runJavaScriptAlertPanelWithMessage:
   initiatedByFrame:completionHandler:] was not called'****

UPDATE:

The solution mentioned below by Stefan is working fine with JS Alert but not with JS Confirm. Following is the code I get same exception even if the completionHandler() is called in ok and cancel button.

-(void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL))completionHandler
{
    MKCLOG_DEBUG(@"%@", frame.request.URL);
    UIAlertController* alert = [UIAlertController alertControllerWithTitle:
                                NSLocalizedString(@"Test", nil) message: message
                                                            preferredStyle: UIAlertControllerStyleAlert];

    UIAlertAction *cancelAction = [UIAlertAction
                                   actionWithTitle:NSLocalizedString(@"Cancel", @"")
                                   style:UIAlertActionStyleCancel
                                   handler:^(UIAlertAction *action)
                                   {
                                       MKCLOG_DEBUG(@"Cancel action");
                                       completionHandler(NO);
                                   }];

    UIAlertAction *okAction = [UIAlertAction
                               actionWithTitle:NSLocalizedString(@"OK", @"OK action")
                               style:UIAlertActionStyleDefault
                               handler:^(UIAlertAction *action)
                               {
                                   MKCLOG_DEBUG(@"OK action");
                                   completionHandler(YES);
                               }];

    [alert addAction:cancelAction];
    [alert addAction:okAction];
}
4

1 回答 1

8

现在设置代码的方式，显示UIAlertView并立即运行completionHandler(). 两者同时发生。

你应该做的是这样的：

UIAlertController* alert = [UIAlertController alertControllerWithTitle:
    NSLocalizedString(@"Test Alert", nil) message: message
        preferredStyle: UIAlertControllerStyleAlert];
UIAlertAction* defaultAction = [UIAlertAction actionWithTitle: @"OK"
    style:UIAlertActionStyleDefault handler:^(UIAlertAction * action) {
      completionHandler();
}]; 
[alert addAction:defaultAction];
[self presentViewController:alert animated:YES completion:nil];

这将显示警报并completionHandler在用户关闭它时调用。

请注意，我使用的是UIAlertController，它仅适用于 iOS 8 及更高版本，但这应该没问题，因为您依赖于WKWebView.

于 2015-10-02T01:23:11.543 回答