With iPad with iOS6, we have this bug where a modal view controller will expand to full screen, even if it is told to be using "form sheet" presentation style. But, this happens only if there are two modals, a parent one and its child.

So this is how the first modal is created and presented:

UINavigationController *navigationController = [[[UINavigationController alloc] initWithRootViewController:controller] autorelease];
navigationController.modalPresentationStyle = UIModalPresentationFormSheet;
[parentController presentModalViewController:navigationController animated:YES];
// parentController is my application's root controller

This is how the child modal is created and presented:

UINavigationController *navigationController = [[[UINavigationController alloc] initWithRootViewController:controller] autorelease];
navigationController.modalPresentationStyle = UIModalPresentationFormSheet;
[parentController presentModalViewController:navigationController animated:YES];
// parentController is the navigationController from above

So when rotating from landscape to portrait, the parent modal will expand to full screen and remain that way even if we rotate back to landscape.

When we have the parent modal all by itself (no child modal), then it works as expected, which is that it remains in form sheet style.

Note that this happens on iOS6 only (device and simulator) and doesn't happen on iOS 5 (simulator and reported to work by testers).

So far, I have tried the following without success:

  • setting wantsFullScreenLayout to NO
  • forcing wantsFullScreenLayout to always return NO by overriding it
  • Making certain my controllers inside the navigation controller also specify UIModalPresentationFormSheet
  • implementing preferredInterfaceOrientationForPresentation
    ios ipad rotation modal-dialog
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