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Re: Core Animation - Animation Sequence
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Re: Core Animation - Animation Sequence


  • Subject: Re: Core Animation - Animation Sequence
  • From: Rodolfo Niborski <email@hidden>
  • Date: Tue, 1 Jun 2010 14:01:13 +0200

Hello,

Neither I did figure out how to use David's code. I thought that overriding the implicit animation implies the use of layer actions. I can't see how
> [layer addAnimation:rotation forKey:@"transform"];
can change the implicit animation.
Besides, most of my attempts resulted in a EXC_BAD_ACCESS crash, and the rest were not successful.

David, could you please be so kind and make your point a little more explicit ?
Thank you again !

@tino : when I set removedOnCompletion to NO for the first animation, the unwanted effect disappears, but the second animation gets occulted.

Rodolfo Niborski
http://itunes.com/apps/yiddishforkids1-alefbeys

Le 1 juin 2010 à 08:51, Tino Rachui a écrit :

> David, Rodolfo,
>
> I'm interested in this too so please excuse me for interfering. What is the root cause for Rodolfo's problem? He doesn't seem to set 'removedOnCompletion' to 'NO' (default is 'YES' according to docu) so I'm wondering if this could cause the unwanted effect (by the way I cannot see the bad effect when I try the example in the simulator though).
> David I'm sure I miss the point but how does your proposed solution solve the problem? I'd really like to better understand.
>
> Thanks,
> Tino
>
> P.S. David, are you using 'kCAValueFundtionRotateZ' intentionally or is this a typo, same for CATransform3DMakeRotation(...)?
>
>
> 2010/5/31 David Duncan <email@hidden>
> On May 31, 2010, at 2:24 PM, Rodolfo Niborski wrote:
>
> > My problem is that at the end of the first animation, the "Hello" message shows up in its initial position for a fraction of a second.
> > I've tried to set the fillMode of the first animation to kCAFillModeForwards with no effect.
>
> What you want to do instead is set the transform of the layer rather than trying to modify the animation to stick around. The code would be something like this:
>
> CABasicAnimation *rotation = [CABasicAnimation animationWithKeyPath:@"transform"];
> rotation.valueFunction = [CAValueFunction functionWithName: kCAValueFunctionRotateZ];
> // setup the rest of the animation as you did previously
> layer.transform = CATransform3DMakeRotation(M_PI, 0, 0, 1);
> [layer addAnimation:rotation forKey:@"transform"];
>
> What this does is it creates a basic animation that does the rotation, and then overrides the implicit animation that is created when you assign the transform to the layer. In this example I use the CAValueFunction rather than the extended keypath as this is more efficient and much more predictable, but doing so requires 10.6.
> --
> David Duncan
> Apple DTS Animation and Printing
>
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> --
> -Tino

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