When exactly do implicit animations take place in iOS?

Question

Everyone and every book claims that there are implicit animations happening in CALayer. However, every time I wanted to verify that so far, I end up with a hard-snap to the

Answer 1

You could also set the layer's delegate to your own object and handle -actionForLayer:forKey:. Seems as if you get implicit animation even if the delegate doesn't implement -actionForLayer:forKey:.