I'm using the following code to schedule a UILocalNotification in my app. The problem is that the notification animates twice.
UILocalNotification *localNotification = [UILocalNotification new];
localNotification.alertBody = @"Test message";
localNotification.fireDate = [NSDate dateWithTimeIntervalSinceNow:3];
[[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
That code is executed in a button action. Then I send the app to the background and wait for the notification to be fired.
What happens is that I only have one notification but the animation (slide down animation) is executed twice.
First I was starting to think that it was an iOS bug, but then I created a very simple project with only the code that fires the notification and the problem did not happen.
When the app enters this state the problem occurs always. If I restart the device then everything starts working as expected. I did not manage to find the pattern that puts the app in this state.
This only happens on iOS 9 devices.
I had the same exact problem a while ago and it was caused by multiple calls to registerUserNotificationSettings when initialising the notifications (in this case, in didFinishLaunchingWithOptions).