Setting alpha to 0 to remove animation? -objective c

Question

I'm developing an iOS application and I have a simple question.

If you start an animation for an image (like rotating it) for an unlimited time, and then after a few seconds set the alpha to zero to hide it [[self image]setAlpha:0];. Is the animation still working in the background or not? Do you always have to set [layer removeAllAnimations];? I'm asking this because I don't wan't to slow down the cpu.

Thanks!

Answer 1

You really want to use removeAllAnimations, not just setting the alpha to zero. If you use a timer or display link to monitor the presentationLayer (which indicates the current properties of the view) of the animated object, you'll see that the animation is still in progress, even if the alpha is zero.