CABasicAnimation not having any effect

Question

I'm having a very simple issue, and I'm pulling out my hair over it. I'm trying to animate the moving of an NSButton. Now, I am aware of the almost overly simple:

[[button animator] setFrame:newCGRect];

However, I'd like to increase the time it takes for the button to travel. So, I looked into the slightly more complex CABasicAnimation. I think I'm doing everything correctly, but the NSButton isn't moving at all.

CGPoint center = CGPointMake(10, 20);

CALayer *layer = button.layer;

layer.position = CGPointMake(button.frame.size.width / 2, button.frame.size.height / 2);

CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"position"];
animation.fromValue = [layer valueForKey:@"position"];
[animation setToValue:[NSValue valueWithPoint:center]];
[animation setFillMode:kCAFillModeForwards];
[animation setRemovedOnCompletion:NO];
[animation setDuration:3.0];

[layer addAnimation:animation forKey:@"position"];

Here, button is the NSButton. I'm setting the position of layer to the center of the button, because I think that "position" has to refer to the center. Then, all I'm doing is moving (supposedly) the button to center, in an animation that is 3 seconds long. I add the animation to the layer, and then, nothing happens.

Now, does anybody know what I'm doing wrong? Or, on a side note, is there anyway to use the animator property and set the length of the animation?

Answer 1

Wrap the implicit animation in a transaction to adjust the animation.

[CATransaction begin];
[CATransaction setAnimationDuration:3];
[[button animator] setFrame:newframe];
[CATransaction commit];