如何判断uiview是否在动画的中间？ [英] how to tell if uiview is in middle of animation?

问题描述

有什么方法来判断uiview是否在动画的中间？当我在打开视图对象时，它正在移动我get（通知有一个animations变量）：

 搜索栏应该结束编辑：< UISearchBar：0x2e6240; frame =（0 0; 320 88）; text =''; autoresize = W + BM; animations = {position =< CABasicAnimation：0x6a69c40> ;; bounds =< CABasicAnimation：0x6a6d4d0> ;; }; layer =< CALayer：0x2e6e00>>当动画停止并打印uiview（animations变量现在消失）时，
  

 搜索栏应该结束编辑：< UISearchBar：0x2e6240; frame =（0 0; 320 88）; text =''; autoresize = W + BM; layer =< CALayer：0x2e6e00>> UIView有一个图层（）;   http://developer.apple.com/library/ios/#documentation/GraphicsImaging/Reference/CALayer_class/Introduction/Introduction.html\"> Google Analytics（分析））。您可以发送 animationKeys 到它，它将给你一个键的数组，标识附加到图层的动画。我想如果有任何条目，动画正在运行。如果您想进一步了解，请查看 CAMediaTiming协议。它对当前动画做了一些更多的信息。
 
Is there any way to tell if a uiview is in the middle of an animation?  When I print out the view object while it is moving i get(notice there is an "animations" variable):
search bar should end editing: <UISearchBar: 0x2e6240; frame = (0 0; 320 88); text = ''; autoresize = W+BM; animations = { position=<CABasicAnimation: 0x6a69c40>; bounds=<CABasicAnimation: 0x6a6d4d0>; }; layer = <CALayer: 0x2e6e00>>
when the animation has stopped and i print the uiview("animations" variable now gone):
search bar should end editing: <UISearchBar: 0x2e6240; frame = (0 0; 320 88); text = ''; autoresize = W+BM; layer = <CALayer: 0x2e6e00>>

解决方案
A UIView has a layer (CALayer). You can send animationKeys to it which will give you an array of keys which identify the animations attached to the layer. I suppose that if there are any entries, the animation(s) are running. If you want to dig even deeper have a look at the CAMediaTiming protocol which CALayer adopts. It does some more information on the current animation.

                        
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