Re: How do I get CATransition to actually work?
Re: How do I get CATransition to actually work?
- Subject: Re: How do I get CATransition to actually work?
- From: Scott Anguish <email@hidden>
- Date: Sat, 27 Oct 2007 19:51:01 -0400
On Oct 27, 2007, at 3:26 PM, Nick Zitzmann wrote:
On Oct 27, 2007, at 12:56 PM, Scott Anguish wrote:
You shouldn't set the before and after images. the inputImage and
inputTargetImage and the outputImage all are set up automatically
for you by Core Animation.
How is it supposed to do that when it does not know the state of the
view? Before I can do the transition, I need to get an
NSBitmapImageRep of the view _before_ its state is changed, and then
get a second image after changing the state of the view. This is in
a view that does its own drawing independently of CoreAnimation.
It's like plugging two images into a transition in the CoreImage Fun
House app.
Ah, you're using it independent of CA.. I believe that this may be the
issue. Transitions are supported for certain types of view actions
(added/removed) but I don't believe you can do it with content like
this. I'm checking though.
If you're in a straight CA environment the layer it can provide the
state before and after by imaging it with the new value you've set the
property to, and the original rendering.. and then animation between
them taking the outputImage each time to display. I'm guessing if you
provide this that the animation mechanism will override the values you
set.
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