Re: Confusing CALayer Transform/Frame/Bounds Behavior
Re: Confusing CALayer Transform/Frame/Bounds Behavior
- Subject: Re: Confusing CALayer Transform/Frame/Bounds Behavior
- From: David Duncan <email@hidden>
- Date: Tue, 24 Jan 2012 17:52:39 -0800
On Jan 24, 2012, at 4:23 PM, Seth Willits wrote:
> Can anyone explain what's going on?
The frame is an entirely synthesized property, based on the bounds, position, anchorPoint and transform of a given layer. When you set the latter parameters, the frame updates automatically but when you set the frame Core Animation has to derive the new bounds & position values by applying the anchorPoint and inverse transform. Thus when you set the frame of a layer while it is under a transform, the inverse transform is first applied to get a new size, then that size updates the bounds size.
Moral of the story is that when a layer is transformed (or may be) you should only manipulate its position and bounds. Stay far far away from the frame property, as its just a bag of hurt.
--
David Duncan
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