Animating UIView problem (matching the expanding animation to the shrinking animation)

Question

Hi,

I'm trying to animate a UIView so that it can grow larger when tapping a button and shrinks down to its original size by tapping the button again.

I do this by adjusting frame to its new size and origin and running the code below.

[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1.5];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
self.theView.frame = frame;
[UIView commitAnimations];

When animating to a bigger size the animation is how it should be. But when animating to its original size (smaller) the view is re-sized instantly and then animated to its designated location.

What I need is that the resizing to the smaller frame is animated as well.

I've tried adjusting the autoresizingMask as well, but that didn't change anything.

Hope someone can help.

thanks.

Answer 1

Try this

[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1.5];
[UIView setAnimationRepeatAutoreverses:YES];
self.theView.frame = frame;
[UIView commitAnimations];

In response to comment;

If you want to control animation reverse, have a flag like BOOL isbig and set it in app launch to NO, then toggle it in every button tap, then check it if it is YES or NO, and according to the result call a method. If NO, call your code, if not call the code again but this time set the frame to the original size.

[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1.5];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
self.theView.frame = originalFrame;
[UIView commitAnimations];

Answer 2

I could solve the problem by suggestion found in other thread, it has its own limitations though. I have posted the code in the same thread where the solution was suggested:

http://stackoverflow.com/questions/818207/uiview-scaling-during-animation/3202828#3202828

Answer 3

Michiel, Raj,

I made a youtube tutorial showing how to make views expand and shrink like in the facebook iPhone app.

Hope it can be of some help: How to make expanding/shrinking views on iPhone SDK

Adam