Subclassing CAKeyframeAnimation

[screwtape]

Hi All,

I'm looking at subclassing CAKeyframeAnimation in order to sync an animation with the associated sound effects. I can't see any methods in the documentation which do anything but I presume that the CALayer must call some methods in the CAAnimation to do the work, but it doesn't seem to be documented.

Anyone any ideas how to do this?

Screwtape.

[prisoner24601]

Originally Posted by screwtape

Hi All,

I'm looking at subclassing CAKeyframeAnimation in order to sync an animation with the associated sound effects. I can't see any methods in the documentation which do anything but I presume that the CALayer must call some methods in the CAAnimation to do the work, but it doesn't seem to be documented.

Anyone any ideas how to do this?

Screwtape.

If you just need to sync an animation with the associated sound effects you don't need to subclass.

You can just use

- (void)animationDidStart:(CAAnimation *)anim;

from the CAAnimation Class

here is the sample from one of my view controllers

- (void)startAnimation{
	
    NSArray*     prisonImages2 = [[NSArray alloc] initWithObjects:
                                 (id)[Utils loadImage:@"ZAM_01.png"].CGImage,
                                 (id)[Utils loadImage:@"ZAM_02.png"].CGImage,
                                 (id)[Utils loadImage:@"ZAM_03.png"].CGImage,
                                 (id)[Utils loadImage:@"ZAM_04.png"].CGImage,       
                                 nil];
    
	CAKeyframeAnimation *animation = [CAKeyframeAnimation animation];
	animation. values = prisonImages2;
        [prisonImages2 release];
	animation. duration = 2;
	animation. autoreverses = NO;
	animation.delegate = self;
	animation.calculationMode = kCAAnimationDiscrete;
        [prisonImageView.layer addAnimation: animation forKey: @"contents" ] ;
      
	
}

- (void)animationDidStart:(CAAnimation *)anim{
   //play your sound, it will start when the animation begins its active duration
}