Question

I’d like to do two animations, one after the other:

[UIView beginAnimations:@"growImage" context:nil];
[UIView setAnimationDuration:0.2f];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
[UIView setAnimationDelegate:self];
image6.transform = CGAffineTransformMakeScale(0.9, 0.9);
[UIView commitAnimations];

[UIView beginAnimations:@"shrinkImage" context:nil];
[UIView setAnimationDuration:0.5f];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
[UIView setAnimationDelegate:self];
image6.transform = CGAffineTransformMakeScale(0.1, 0.1);
[UIView commitAnimations];

I know that I can do the second animation in

- (void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {

or by setting a

[UIView setAnimationDidStopSelector:@selector(shrinkImage)];

But is there a way that I can pass in the value (in this case a UIIMageView named image6) so that the second animation occurs on the same object as the first one?

THANKS!

Answer 1

If you want to use the selector-based approach, the selector that you specify in the setAnimationDidStopSelector gets passed a context parameter that you specify in your beginAnimations:context: call.

So, if you change your beginAnimations call to:

[UIView beginAnimations:@"growImage" context:image6];

then image6 will get passed as the context parameter to your selector.

An easier way would be to use blocks to accomplish the same thing:

[UIView animateWithDuration:0.2 animations:^() {
    image6.transform = CGAffineTransformMakeScale(0.9, 0.9);
}
completion:^(BOOL finished) {
    [UIView animateWithDuration:0.2 animations:^() {
        image6.transform = CGAffineTransformMakeScale(0.1, 0.1);
    }];
}];