UIAlertController automatically dismisses in iOS 10 - objective-c

Question

I have a UIAlertController in my AppDelegate and present it with my rootViewController when I receive a notification. But when the alert view pops up, it quickly dismisses itself instead of waiting for a tap event on the "Ok" button... Here's my code in AppDelegate.m. Any idea? Thanks!
- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification {
[self showNotification:"Success message here"];
}
- (void)showNotification:(NSString *)text {
UIAlertController* avc = [UIAlertController alertControllerWithTitle:#"Success" message:text
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *ok = [UIAlertAction actionWithTitle:#"Ok" style:UIAlertActionStyleCancel handler:nil];
[avc addAction:ok];
[self.window.rootViewController presentViewController:avc animated:true completion:nil];
}
EDIT: I have another view controller; call it X. X's viewDidLoad function has a timer counting down before X dismisses itself and presents another view controller. I noticed an interesting timing issue here: when the notification comes slowly enough so that the UIAlertController appears after X's timer is up and another view controller has been presented, the alertController doesn't dismiss itself. If the opposite happens - the notification comes quickly enough making the UIAlertController appears before X dismisses itself, then the whole AlertController will be flushed when the timer is up (which makes sense, I guess...). How can I prevent this from happening?

Answer 1

You can use perform selector method, like this:
- (void)showNotification:(NSString *)text {
UIAlertController* avc = [UIAlertController alertControllerWithTitle:#"Success" message:text
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *ok = [UIAlertAction actionWithTitle:#"Ok" style:UIAlertActionStyleCancel handler:nil];
[avc addAction:ok];
[self performSelector:#selector(dissmissAlert:) withObject:avc afterDelay:3.0];
[self.window.rootViewController presentViewController:avc animated:true completion:nil];
}
-(void)dissmissAlert:(UIAlertController *) alert{
[alert dismissViewControllerAnimated:true completion:nil];
}