On Nov 9, 2012, at 11:54 AM, cocoa-dev-requ...@lists.apple.com wrote:

> Date: Fri, 09 Nov 2012 14:53:57 -0500
> From: "Eric E. Dolecki" <edole...@gmail.com>

> //This is resetting the rotation to 0 - a visible jump

Think of animation as a kind of movie projected on a screen in front of your 
actual static drawing. When the animation stops, the movie screen is ripped 
away, revealing your actual drawing underneath. It is up to you to make your 
drawing look like the last frame of the movie - otherwise, you'll see a jump 
back to the initial position, where your real drawing has been sitting all that 
time.

http://www.apeth.com/iOSBook/ch17.html

m.
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