How to remove a layer when its animation completes?

Question

I am making an iOS App. I have several CALayer objects that eventually will be deleted by a (shrinking) animation. When the animatio

Answer 1

One alternativ solution is to add a layer pointer to the animation object's dictionary, as follows

// in some define section
#define kAnimationRemoveLayer @"animationRemoveLayer"

then, in the animationDidStop,

- (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag{
    CALayer *lay = [theAnimation valueForKey:kAnimationRemoveLayer];
    if(lay){
        [lay removeAllAnimations];
        [lay removeFromSuperlayer];
    }
}

and, finally, in the animation setup,

CALAyer * lay = ... ;
BOOL    shouldRemove = .... ; 
CABasicAnimation* anim = [CABasicAnimation animationWithKeyPath:@"position"];
anim.delegate = self;
if (shouldRemove)
    [anim setValue:lay forKey:kAnimationRemoveLayer];