I am a little bit confused by Scott's statement that "if you use layers-hosting views, then you should not rely on view drawing at all ... conversely, if you use layer-backed views then you should not directly access the views." I may just misunderstand what Scott means, but I have used layer-backed views with great success. In a typical scenario, I implement a custom NSView subclass just like I would before Core Animation Layers. To animate the view's drawing, I use a timer to trigger calls to -setNeedsDisplay: and implement -drawRect: to draw whatever stage of the animation is appropriate based on the current time. I have not had any problems when my ordinary custom views become layer backed... I don't think... And I get transparency and layering over opengl content for "free" with layer-backed views. I used to do similar things before Core Animation too. Apple provided an "overlay view" sample that did the same things. _______________________________________________
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