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!
For iPhone 3.0+, a basic crossfade is easiest to do like this:
modalViewController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[[self navigationController] presentModalViewController:modalViewController
animated:YES];
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.
To update for alpha fading in iOS 4:
modalController.view.alpha = 0.0;
[self.view.window.rootViewController presentModalViewController:modalController animated:NO];
[UIView animateWithDuration:0.5
animations:^{modalController.view.alpha = 1.0;}];
It should be [self.view.window]
in order for the code to work
(at least that's the way that it is in ios 3.2)
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