Custom Animation for Pushing a UIViewController

I want to show a custom animation when pushing a view controller: I would like to achieve something like an "expand" animation, that means the new view expands from a given rectangle, lets say [100,100 220,380] during the animation to full screen.

Any suggestions where to start, respectively any documents, tutorials, links? :)

Alright. I could make the expand animation with the following code:

if ([coming.view superview] == nil)   
    [self.view addSubview:coming.view];
    coming.view.frame = CGRectMake(160,160,0,0);
    [UIView beginAnimations:@"frame" context:nil];
    [UIView setAnimationDuration:4];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    [coming viewWillAppear:YES];
    [going viewWillAppear:YES];
    coming.view.frame = CGRectMake(0, 0, 320, 480);
    [going viewDidDisappear:YES];
    [coming viewDidAppear:YES];
    [UIView commitAnimations];

My View is properly displayed, but unfortunately the navigation bar is not updated. Is there a way to do that manually?

In the sample code, a function is called all 0.03 seconds that updates the transformation of the view. Unfortunately, when pushing a UIViewController, I am not able to resize the frame of the view ... am I ?

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@zoul: That worked great! I just changed "self" to "self.navigationController" and "self.view" to "self.navigationController.view" Don't know if that was necessary, but it worked. And @crafterm, as for popping back, just make your own leftBarButtonItem by adding this code in viewDidLoad or ViewWillAppear:

//add your own left bar button
UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStylePlain target:self action:@selector(backButtonTapped)];
self.navigationItem.leftBarButtonItem = backButton;
[backButton release];

Then I just tweaked the push function and made this popWithTransition function that I called in my -backButtonTapped method.

- (void) popWithTransition: (UIViewAnimationTransition) transition
{
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:.75];
    [UIView setAnimationBeginsFromCurrentState:YES];        
    [UIView setAnimationTransition:transition forView:self.navigationController.view cache:YES];
    [UIView commitAnimations];
[self.navigationController popViewControllerAnimated:NO];
}

Note that the popViewController call got shifted down to the end, after the animation. Don't know if that's kosher, but again, it worked.

answered 2010-08-11T23:23:29.020

Custom Animation for Pushing a UIViewController

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