iOS CABasicAnimation issues

[99miles]

I have a UIImageView that I'm trying to animate, but the animation puts it in the wrong location.

As a test I got the frame of the image:

CGRect frame = bucketView.characterImageView.frame;
frame.origin.y = 27;

then tried setting the frame to 27 in both of the following ways:

bucketView.characterImageView.frame = frame;
[bucketView.characterImageView layer].frame = frame;

In each case the UIImageView is set exactly where I's expect it.

However, when I try to animate it, is uses a different location (above where it should be), even though I'm still using a y value of 27

CABasicAnimation *positionAnimation;
positionAnimation				= [CABasicAnimation animationWithKeyPath:@"position.y"];
positionAnimation.fromValue		= [NSNumber numberWithFloat:27.0f];
positionAnimation.toValue		= [NSNumber numberWithFloat:27.0f];
positionAnimation.duration		= 1;
	
anim				= [CAAnimationGroup animation];
anim.animations		= [NSArray arrayWithObjects: positionAnimation, nil];
anim.duration		= 1;

[[bucketView.characterImageView layer] addAnimation:anim forKey:@"position.y"];

I have to same to and from values in that animation simply as a test.

Any ideas why it's placing the image in the wrong location?

Thanks!

 

[99miles]

Aw, crappers. I realized in the animation position.y is not the same as the y of the frame. It's relative to the anchor point, which the docs say is (0,0) by default, but it's actually the centerpoint.

Getting closer.