Question

So there seems to be an issue with animating size transformations for UIButtons. Specifically, if you have a button of type UIButtonTypeCustom, any frame size transformations happen instantly. Movement and other animations happen as normal.

Does anyone have a good fix for this? I m guessing that it s because the custom buttons contain images, and something is going wrong when UIView calculates its transformations.

This guy seems to have found the same problem, but no workaround.

Here s an example. The image origin will move smoothly from 0.0,0.0 to 100.0,100.0 over two seconds, but the size instantly jumps to 200x200.

UIButton *tButton = [UIButton buttonWithType:UIButtonTypeCustom];
[tButton setBackgroundImage:tImage forState:UIControlStateNormal];
tButton.frame = CGRectMake(0.0, 0.0, 10.0, 10.0);

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:2.0];

tButton.frame = CGRectMake(100.0, 100.0, 200.0, 200.0);

[UIView commitAnimations];

Answer 1

Credit goes to davbryn for this answer but instead of redefining the frame you use:

button.transform = CGAffineTransformMakeScale(1.5,1.5);

Its not as easy as just using a new frame so you will have to play around with the it but it should get you pointed in the right direction.

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