Hi guys,
I need to animate the frame of a CALayer instance; during the animation I 
should also update/redraw the content of the layer based upon the new size 
(frame by frame) of it.

I've tried to watch and use -displayLayer:inContext: of CALayer (it's a 
delegate property) but It does not work: both with frame (it's a derived 
property of bounds/location/anchorPoint) and bounds animation I can't receive 
this message (it should be called by CALayer's internal drawInContext: method) 
during the animation process.

Using needsDisplayOnBoundsChange I can get it called at the end of the 
animation, but nothing with bounds.
It works fine with custom properties (I need to return YES on 
needsDisplayForKey method).

Any idea?
Is possible to force redraw of CALayer contents during bounds/frame animation?
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