Question

I am trying to perform multiple UIView animations one after the other. However, I’ve heard that it’s bad practice to perform multiple UIView animations one after the other, and that I should instead use Core Animation. I tried this code:

//First Animation
[UIView beginAnimations:@"animation1" context:nil];
[UIView setAnimationDuration:2];
nwView.backgroundColor = [UIColor redColor];
nwView.frame = CGRectMake(CGRectGetMidX(screenSize),
                          CGRectGetMinY(screenSize),
                          width, 
                          height);
nwView.transform = CGAffineTransformMakeRotation(45.0f);
[UIView commitAnimations];

//Second Animation
[UIView beginAnimations:@"second animation" context:nil];
[UIView setAnimationDuration:2];

nwView.transform = CGAffineTransformMakeScale(0.5, 0.33);
nwView.backgroundColor = [UIColor purpleColor];

[UIView commitAnimations];

But it only does the second animation. I know this question is similar to UIView two animations coexisting, but it has a slightly different context.

Answer 1

I don’t think there is anything wrong with doing 2 animations in a row using UIView blocks. Just make sure you start your second animation in the completino block of the first animation.

Without blocks (your example) it is not working as you will have to set a delegate to the animation or set a selector for setAnimationDidStopSelector. There you should start the second animation.

But again, nothing wrong in doing animations with blocks (it is the preferred way).