Re: Synching Animations Across CALayers
Re: Synching Animations Across CALayers
- Subject: Re: Synching Animations Across CALayers
- From: "E. Wing" <email@hidden>
- Date: Fri, 23 May 2008 16:17:49 -0700
On 5/23/08, Dmitri Goutnik <email@hidden> wrote:
>
> On May 23, 2008, at 11:18 AM, Bridger Maxwell wrote:
>
>> Perhaps there is a way to see how far along the
>> animation is for a given layer, and be able to make another layer
>> synch to
>> the same time. Surely this has to be possible.
>>
>
> Haven't tried this myself but it should be possible to get currently
> displayed animation values using CALayer presentationLayer property.
>
> -Dmitri
>
The presentationLayer is a pretty good idea and definitely worth
trying. I do wonder about imperfect timing issues though. As I
understand it, Core Animation operates on its own thread so there
might be a slight skew between the time you query the value and the
time it takes to dispatch a new animation. I would be curious to know
the results of actually trying this.
If this doesn't work out, depending on your application, maybe another
thing to try is pre-creating all the pulsing layers at the same time
within a CATransaction block, but keep them hidden until you need
them. Then as you need them swap a non-pulsing layer for a pulsing
one. Not sure of the exact details as I haven't tried this.
-Eric
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