完成后未删除时如何重用CABasicAnimation？

问题描述

很多人都在谈论使用CABasicAnimation对象之后。

Lots of people are talking about keeping an CABasicAnimation object around after it has been used.

因此，通过设置

动画完成后，动画对象将保持附着在图层上。我该如何在不创建新的CABasicAnimation的情况下再次重新启动该动画？

the animation object keeps attached to the layer when the animation is complete. How would I re-launch this animation again without creating a new CABasicAnimation?

保持该对象的意义何在？我知道的唯一好处是，我们可以将removeOnCompletion = NO设置为kCAFillModeForwards，以便Core Animation不会将视觉表示恢复为CALayer中的模型值。

What's the point of keeping this object around? The only benefit I know is that we can set removedOnCompletion = NO and set kCAFillModeForwards so that Core Animation does not revert the visual representation back to the model values in the CALayer.

但是如何像每个人都在谈论的那样重新使用动画？

But how to re-use the animation, like everyone is talking about?

推荐答案

尝试一下：

1. 使用

要在以后获得对它的引用，请调用

To get a reference to it later, call [layer animationForKey:@"myKey"]

阅读解释了如何暂停和恢复（重新启动）动画。

Read this note from Apple which explains how to pause and resume (restart) animations.

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