Question

I’m currently displaying a UIViewController like this:

[[self navigationController] presentModalViewController:modalViewController animated:YES]; 

and hiding it like this:

[self.navigationController dismissModalViewControllerAnimated:YES]; 

The animation is ‘slide up from the bottom’… then slide back down. How can I change the animation style? Can I made it fade in/out?

Cheers!

Answer 1

Marcus Zarra posted a great solution to this on the SDK mailing list:

UIViewController *controller = [[[MyViewController alloc] init] autorelease]; UIViewAnimationTransition trans = UIViewAnimationTransitionCurlUp; [UIView beginAnimations: nil context: nil]; [UIView setAnimationTransition: trans forView: [self window] cache: YES]; [navController presentModalViewController: controller animated: NO]; [UIView commitAnimations]; 

There are transitions for flipping and page-curling. If you are set on fading, can try adjusting your new view’s alpha:

UIViewController *controller = [[[MyViewController alloc] init] autorelease]; controller.view.alpha = 0.0; [navController presentModalViewController: controller animated: NO]; [UIView beginAnimations: nil context: nil]; controller.view.alpha = 1.0; [UIView commitAnimations]; 

However, what you probably want is a crossfade, or at least a fade-over. When the UINavigationController switches to a new view, it removes the old one. For this effect, you’re probably better off just adding a new view to your existing UIViewController and fading its alpha in over time.

Note: If you are not in your app delegate [self window] will not work. Use self.view.window , thanks to user412500’s post for pointing this out.