Dismissing UIAlertViews when entering background state

Question

Apple recommends dismissing any UIAlertViews/UIActionSheets when entering background state in iOS 4. This is to avoid any confusion on the user's part when he relaunches the application later. I wonder how I could elegantly dismiss all UIAlertViews at once, without retaining a reference to it everytime I set one up...

Any idea ?

Answer 1

My call would be to add a category to UIAlertview adding the following function :

- (void) hide {
  [self dismissWithClickedButtonIndex:0 animated:YES];
}

And to suscribe to UIApplicationWillResignActiveNotification :

[[NSNotificationCenter defaultCenter] addObserver:alertView selector:@selector(hide) name:@"UIApplicationWillResignActiveNotification" object:nil];