Re: Drawing in CALayers
Re: Drawing in CALayers
- Subject: Re: Drawing in CALayers
- From: Erik Buck <email@hidden>
- Date: Tue, 17 Jun 2008 13:50:20 -0700 (PDT)
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.
_______________________________________________
Cocoa-dev mailing list (email@hidden)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden