CALayer/CAAnimation doesn't animate

Subject: CALayer/CAAnimation doesn't animate
From: Joachim <email@hidden>
Date: Mon, 14 Jan 2008 23:37:10 +0100
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I have spent hours on this - I now throw in the towel...

I have a view that will contain several layers I want to animate. There are no subviews in my view, and I'd like to keep it that way.

I have made this simple example to illustrate the problem. It's a method of the view that is supposed to add a layer and animate it:

- (void)animateNewLayer
{
    // Create layer
    CALayer *layer = [CALayer layer];

    // Configure layer
    layer.frame = CGRectMake (0, 0, 24, 24);
    layer.contents = myCGImageRef; // Created earlier in this method
    CGImageRelease (myCGImageRef);

    // Add the layer to our view's root layer
    self.wantsLayer = YES;
    [self.layer addSublayer:layer];

// Create animation CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"frameOrigin"];

// Configure animation anim.fromValue = [NSValue valueWithPoint:NSMakePoint (0, 0)]; anim.toValue = [NSValue valueWithPoint:NSMakePoint (100, 100)]; anim.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; anim.duration = 2.0; anim.delegate = self;

    // Add animation to layer; also triggers the animation
    [layer addAnimation:anim forKey:@"frameOrigin"];
}

There are several problems with this code:

1) When the code runs, the layer appears containing the loaded image at (0, 0) as expected, but it doesn't move 2) If I change the keyPath to either @"opacity" or @"borderWidth", the layer does animate, but as soon as it's done animating, the layer goes back to its original appearance, and the animation doesn't take the 2 secs to complete - only a fraction 3) The delegate method, animationDidStart:, is only called in (2), not in (1), and animationDidStop: is never called in any of the scenarios

I'm totally stuck in this. Any help is hugely appreciated. I think I'm doing what's suggested in the examples in Core Animation Programming Guide, but obviously not.

Am I handling the layer hierarchy correctly? For example, can I use the view's backing layer as the root of the layer hierarchy?

Thaks in advance,
Joachim
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Re: CALayer/CAAnimation doesn't animate
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