Re: CALayer maybe silly question
Re: CALayer maybe silly question
- Subject: Re: CALayer maybe silly question
- From: David Duncan <email@hidden>
- Date: Mon, 25 Jan 2010 12:39:10 -0800
On Jan 25, 2010, at 12:02 PM, vincent habchi wrote:
> the silly question is this: is it possible to redraw a CALayer in background?
>
> More specifically, I've written a delegate method drawLayer:inContext: that creates a thread that does the drawing then returns.
If you want to draw to a layer on a separate thread, you need to run the runloop on that thread, as Core Animation is pretty highly dependent on the run loop operating. If you call -setNeedsDisplay on a thread where you never run the runloop, then it is likely that the layer's -display method will not be called until the thread terminates, which is likely your issue.
--
David Duncan
Apple DTS Animation and Printing
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