CATransform3D 始终成为最顶层视图
我正在使用 CATransform3D 转换一个 UIView 的图层。问题是我无法在其上方显示其他控件（不是此转换视图的子视图）。
例如，此代码：
[UIView flipTransitionFromView:self.standardImageView
toView:self.flippedImageView
duration:1.0f
completion:NULL];
[self.view insertSubview:flippedCloseButton aboveSubview:flippedImageView];
不起作用 - FlippedCloseButton 始终位于 FlippedImageView 后面。
flipTransitionFromView 是一种仅进行上述 3d 变换的方法。
任何如何解决它的想法都将受到高度赞赏！
编辑：
我自己通过修改视图层的 zPosition 解决了这个问题：
self.flippedCloseButton.layer.zPosition = self.flippedImageView.layer.zPosition + 1;
但是这是正确的方法吗？
安德鲁斯
I'am transforming one UIView's layer by using CATransform3D. The problem is that I can't display other controls (which are not subviews of this transformed view) above it.
For example this code:
[UIView flipTransitionFromView:self.standardImageView
toView:self.flippedImageView
duration:1.0f
completion:NULL];
[self.view insertSubview:flippedCloseButton aboveSubview:flippedImageView];
does not work - the flippedCloseButton is always behind the flippedImageView.
flipTransitionFromView is a method which merely makes the said 3d transformation.
Any ideas how to solve it are highly appreciated!
EDIT:
I kinda solved it myself by modifying the view layers' zPosition:
self.flippedCloseButton.layer.zPosition = self.flippedImageView.layer.zPosition + 1;
But is it the correct way to do this?
Andrius
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评论（1）
我遇到了类似的问题，但更改 zPosition 并没有解决它。 zPosition 用于为图层提供视角（以便当 z 较大时它看起来更小），但我认为并不意味着原谅可见性序列。
我不完全理解发生了什么，但是当多个子层出现在同一“层级别”时，“什么是可见的”问题没有明确定义。我什至让图层的一部分可见，而另一部分则不可见。
在我的例子中，我通过将必须位于超级层顶部的元素解决了这个问题。这确保了它们始终可见。
在图层和动画方面，我绝不是专业人士，但在自我教育的过程中，我制作了一个应用程序（PerspectiveTest），它解释了图层参数和透视如何协同工作的一些基础知识。可能有一些帮助：
http://itunes.apple.com/nl/app/perspectivetest/id481006743 ?mt=8
问候，
沃佩
I had a similar problem, but changing the zPosition did not solve it. The zPosition is used when giving a perspective to the layer (so that it looks smaller when z is larger), but not meant forgiving a visibility sequence I believe.
I do not fully understand what is happening, but when several sublayers are present at the same "Layer level", the question "what is visible" is not well- defined. I even had that part of a layer was visible and the other part was not.
I solved this in my case by putting the elements that have to be on top in the super layer. That ensures they are alway visible.
I am by no means a pro when it comes to Layers and animation, but in the course of educating myself, I made an App (PerspectiveTest) that explains some basics of how layer parameters and perspective work together. Might be of some help:
http://itunes.apple.com/nl/app/perspectivetest/id481006743?mt=8
Regards,
Voppe