Re: Pausing an animation
Re: Pausing an animation
- Subject: Re: Pausing an animation
- From: David Duncan via Cocoa-dev <email@hidden>
- Date: Tue, 17 Sep 2019 13:35:24 -0700
> On Sep 17, 2019, at 1:19 PM, Gabriel Zachmann via Cocoa-dev
> <email@hidden> wrote:
>
> I have a layer with two animations.
>
> I would like to pause this animation occasionally .
> To do so, I set layer.speed = 0.0;
>
> In the past, this has worked (with slightly different animations).
> However, in this case, the layer seems to just disappear.
> (the layer occupies the whole screen, and when I set speed-0, the screen is
> black)
>
> Does anyone have an idea what might be the reason why it doesn't work?
> Are there properties that do not work with speed = 0?
Setting just the speed will often return you to the “beginning of time” for
your CAMediaTiming compliant object (CALayer and CAAnimation the most common
compliant objects).
<localTime> = (<parentTime> - beginTime) * speed + timeOffset
So if you want to pause a layer, you also need to set the timeOffset to a value
that matches the current value of <localTime>
QA1673 has a proper implementation for doing this
<https://developer.apple.com/library/archive/qa/qa1673/_index.html
<https://developer.apple.com/library/archive/qa/qa1673/_index.html>>
>
> Thanks a lot in advance.
> Gabriel.
>
>
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