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Missing Core Animation Callbacks or Observing or whatever
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Missing Core Animation Callbacks or Observing or whatever


  • Subject: Missing Core Animation Callbacks or Observing or whatever
  • From: Manfred Schwind <email@hidden>
  • Date: Wed, 27 Feb 2008 18:16:25 +0100

Core Animation is great. But I am missing something: I want to get called if something specific happens at the presentation layer. I want to get "informed" about the state of the animation.

An example:
When "flipping" a layer by rotating around the y axis, I want to know when the layer passes the 90 degrees angle.


One idea is to set up a timer exactly half the duration of the flipping animation and I'm done. It's a little "hacky" because of the different timer that may not exacly in sync with the animation timing, but let's say this is not so important for now. Problem here: depending on the timing function this might not work. It works with Linear and EaseInEaseOut, but not with EaseIn or EaseOut etc. (unless I do exactly know what functions are used for EaseIn or EaseOut.) But even if I know the time - what if the layer was already at some partially flipped state because another animation was still running and therefore the rotation just gets "re-targeted"? So I can not really tell at which time the layer passed the 90 degrees without having very specific knowledge about animating times, retargeting behaviour etc. ...

Another idea was to split the animation into two separate animations. One rotates from current to 90 degrees and the other from 90 to 180 degrees. But here I have the same problem with re-tageting. It looks very ugly if "current" is not 0 degrees.

Then I had the idea to "observe" the rotation value via KVO somehow - but this also makes no sense of course, because I am at model layer. As far as I know I can not get hands on the presentation layer (I only get a copy of it at any time).

Is there any way to do something like that? Kind of observing animated value changes (observing values at presentation layer)?

Regards,
Mani
--
http://www.mani.de
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