On Thu, Feb 9, 2012 at 11:09 AM, Fritz Anderson <[email protected]> wrote:
> * Create a duplicate CAShapeLayer (maskL) with [[CAShapeLayer alloc] 
> initWithLayer: shapeL].
>        - Adjust the fill color to blackColor, because masking goes by alpha.

The CALayer documentation makes it quite clear that you should never,
ever do this:

"Note: Invoking this method in any other situation will produce
undefined behavior. Do not use this method to initialize a new layer
with an existing layer’s content."

https://developer.apple.com/library/ios/#documentation/GraphicsImaging/Reference/CALayer_class/Introduction/Introduction.html

--Kyle Sluder

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