UIView动画行为不正常

Question

I have a UIButton (size 100,100) with text and a colored background. When the button is pressed, I want the text to disappear immediately and the button to change size, animated, to 1000,1000. Here is the code I'm using:

    [myButton setTitleColor:[UIColor colorWithRed:195/255.0f green:255/255.0f blue:180/255.0f alpha:0.0f] forState:UIControlStateNormal];

    [UIView animateWithDuration:2.0f
                          delay:1.0f
                        options:UIViewAnimationCurveEaseInOut
                     animations:^{

                     [myButton setBounds:CGRectMake(0, 0, 1000, 1000)];

                     }
                    completion:^(BOOL finished){
                     SetupView * sv = [[SetupView alloc] initWithNibName:nil bundle:nil];
                     //[self presentViewController:sv animated:NO completion:nil];

                 }
 ];

Now, if I take out setTitleColor , the button expands just fine, but the text is still there (obviously). However, keeping setTitleColor in makes the button size 0,0 and then animates to 100,100. This also happens when I replace setTitleColor with setTitle:@"" . I've also tried changing the text or color in the animation with the same result.

I feel like it's something obvious I've missed, but I can't seem to see it.

edit: If I don't run the animation and just do setTitleColor or setTitle:@"" by themselves, the text disappears as expected and the button stays the same size.

Answer 1

If you want to preserve the way you used UIKit to style your button, just modify the layer in the animation block, not the view.

 button.layer.transform = CATransform3DMakeScale(10,10,1)

Maybe it is even sufficient to use the view's transform property.

button.transform = CGAffineTransformMakeScale(10,10)

NB 10 is just an arbitrary large value.