CALayer Animation Vertical Bounce

gistfile1.m

CABasicAnimation *bounceAnimation = [CABasicAnimation animationWithKeyPath:@"position.y"];
        bounceAnimation.duration = .75;
        bounceAnimation.speed = 1.25;
        bounceAnimation.fromValue = [NSNumber numberWithInt:0];
        bounceAnimation.toValue = [NSNumber numberWithInt:-15];
        bounceAnimation.repeatCount = INT_MAX;
        bounceAnimation.autoreverses = YES;
        bounceAnimation.fillMode = kCAFillModeForwards;
        bounceAnimation.removedOnCompletion = NO;
        bounceAnimation.additive = YES;
        
        [annotationView.layer addAnimation:bounceAnimation
                                   forKey:@"bounceAnimation