How to reuse an CABasicAnimation when not removed after completion?

Question

Lots of people are talking about keeping an CABasicAnimation object around after it has been used.

So by setting

removedOnCompletion = NO

the animation object keeps attached to the layer when the animation is complete. How would I re-launch this animation again without creating a new CABasicAnimation?

What's the point of keeping this object around? The only benefit I know is that we can set removedOnCompletion = NO and set kCAFillModeForwards so that Core Animation does not revert the visual representation back to the model values in the CALayer.

But how to re-use the animation, like everyone is talking about?

Answer 1

Try this:

1. Add the animation with a key using [layer addAnimation:myAnimation forKey:@"myKey"]

2. To get a reference to it later, call [layer animationForKey:@"myKey"]

3. Read this note from Apple which explains how to pause and resume (restart) animations.