如何将UIView的一部分显示在UIView的视图层次结构的后面并朝前
[英]How to display part of a UIView at the back of a view hierarchy in a UIView towards the front
问题描述
I have a UIImageView on my storyboard that displays an image that takes up the entire screen with aspect fill. 
我的情节UIImageView板上有一个UIImageView ，它显示一个图像，该图像占据了整个屏幕的宽高比。 Then on top of that I have a large UIView that is centered on screen called middleView. 然后最重要的是，我有一个大的UIView ，它位于屏幕中间，称为MiddleView。 I am wondering how I can add custom UIViews on screen that will display the back UIImageView , but will only display the portion that they cover. 我想知道如何在屏幕上添加自定义UIViews ，以显示背面的UIImageView ，但仅显示它们覆盖的部分。 The effect I am wanting is for the custom UIViews to make it look like the large centered UIView middleView has holes in it. 我想要的效果是自定义UIViews ，使它看起来像大集中UIView middleView有孔。 Also I need for the front custom UIViews to be transformable so that the image inside them is always what is on the back imageView at their current position. 另外，我还需要前端自定义UIView是可变形的，以便它们内部的图像始终是背面imageView上当前位置的图像。
Final note: The image for the back UIImageView will always be the same so I don't necessarily need it to know what the back UIImageView is. 最后要注意：背面UIImageView的图像将始终相同，因此我不一定需要知道背面UIImageView是什么。 The imageView will always be initialized with the same UIImage, start at the origin, and fill the screen with an aspect fill. imageView将始终使用相同的UIImage进行初始化，从原点开始，并用宽高比填充屏幕。
1 个解决方案
解决方案1
0 已采纳 2014-05-20 03:21:10
The effect I am wanting is for the custom UIViews to make it look like the large centered UIView middleView has holes in it
It would be a lot simpler, surely, if the UIView middleView really did have holes in it. 如果UIView middleView确实确实有孔，那肯定会简单得多。 This is easily achieved with a layer mask. 这可以通过层掩膜轻松实现。
For example, this image of Venus has two square holes in it, revealing an angry-looking dude from a Stack Overflow ad behind it: 例如，这张金星图像上有两个方孔，从背后的Stack Overflow广告中露出了一个愤怒的家伙：
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