您的问题是动画停止， ，但是滤波器仍然保持最小的模糊。

Your problem is that the animation stops and is automatically removed, but the filter lingers with the tiniest of blur applied.

您想要做的是在动画完成时删除模糊过滤器。您需要向 CABasicAnimation 实例添加一个委托，并实现 - [id animationDidStop：finished：] 方法。

What you want to do is to remove the blur filter when the animation completes. You need to add a delegate to the CABasicAnimation instance and implement the -[id<CAAnimationDelegate> animationDidStop:finished:] method.

如果你让 self 这种情况应该是相当简单，添加这一行之前添加动画到您的图层：

If you let self be the delegate in this case it should be fairly simple, add this line before adding the animation to your layer:

blurAnimation.delegate = self;

回调也很简单：

- (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag {
    [[self layer] setFilters:nil];
}