Restoring animation where it left off when app resumes from background

Question

I have an endlessly looping CABasicAnimation of a repeating image tile in my view:

a = [CABasicAnimation animationWithKeyPath:@\"position\"];
a         


        

Answer 1

It's surprising to see that this isn't more straightforward. I created a category, based on cclogg's approach, that should make this a one-liner.

CALayer+MBAnimationPersistence

Simply invoke MB_setCurrentAnimationsPersistent on your layer after setting up the desired animations.

[movingView.layer MB_setCurrentAnimationsPersistent];

Or specify the animations that should be persisted explicitly.

movingView.layer.MB_persistentAnimationKeys = @[@"position"];