Hello, I have an 'NSInternalInconsistencyException': 'Completion handler
passed to -[ViewController
webView:runJavaScriptAlertPanelWithMessage:initiatedByFrame:completionHandler:]
was not called'
JavaScript sends message to wkwebkit, and imediatelly after runs
alert('test') (from same jscript function)
The message sent to webkit will trigger some UI to come up from 3rd party
pod (via presentViewController), and the return, and alert will get fired
from script.
The alert is NOT visible now (because the UI from pod came up), But now
when I dismiss the ui, the app trhows exception above.
What dismisses the alert (or why does alert's completion routine is not
called if it wasn't dismissed with button)?
Script part:
<script ...>
window.webkit.messageHandlers.external.postMessage({some json data} );
alert('test');
</script>
cocoa in webkit to receive messages:
- (void)userContentController:(WKUserContentController
*)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {
//...
AppDelegate *app = (AppDelegate *)[[UIApplication sharedApplication]
delegate];
[app someDelegateMethod];
//...
}
// now in app delegate:
- (void) someDelegateMethod {
//...
UIViewController *uiView = [[... //this returned from a 3rd party cocoa pod)
[[self topViewController] presentViewController:uiView animated:YES
completion:nil];
//...
}
// wk alert message
- (void)webView:(WKWebView *)webView
runJavaScriptAlertPanelWithMessage:(NSString *)message
initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void
(^)(void))completionHandler {
UIAlertController *alertController = [UIAlertController
alertControllerWithTitle:webView.URL.host message:message
preferredStyle:UIAlertControllerStyleAlert];
[alertController addAction:[UIAlertAction
actionWithTitle:NSLocalizedString(@"Close", "Close (panel/dialog/alert)")
style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {
completionHandler();
}]];
[self presentViewController:alertController animated:YES
completion:nil];
}
// utils, for getting topViewController
- (UIViewController*)topViewController {
return [self topViewControllerWithRootViewController:[UIApplication
sharedApplication].keyWindow.rootViewController];
}
-
(UIViewController*)topViewControllerWithRootViewController:(UIViewController*)rootViewController
{
if ([rootViewController isKindOfClass:[UITabBarController class]]) {
UITabBarController* tabBarController =
(UITabBarController*)rootViewController;
return [self
topViewControllerWithRootViewController:tabBarController.selectedViewController];
} else if ([rootViewController isKindOfClass:[UINavigationController
class]]) {
UINavigationController* navigationController =
(UINavigationController*)rootViewController;
return [self
topViewControllerWithRootViewController:navigationController.visibleViewController];
} else if (rootViewController.presentedViewController) {
UIViewController* presentedViewController =
rootViewController.presentedViewController;
return [self
topViewControllerWithRootViewController:presentedViewController];
} else {
return rootViewController;
}
}
Thank you
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