iOS控制子视图的UIView alpha行为 [英] iOS controlling UIView alpha behaviour for subviews

问题描述

在我的示例中，我有3个视图：一个包含两个白色视图的红色视图。我将红色容器视图的alpha更改为0.3并且发生这种情况（查看图像，当前结果）。

In my example, I have 3 views: one red view containing two white views. I change the red container view's alpha to 0.3 and this happens (look at the image, the current result).

通过看到这一点，我只能假设（告诉我，如果我错了）设置视图的alpha也将设置其所有子视图的alpha。我的问题是：有没有办法简单地告诉红色视图作为一个整体，以便设置其alpha会给出看起来像想要的结果（在图像中）？

By seeing this, I can only assume (tell me if I'm wrong) that setting a view's alpha will also set all of its subviews' alphas. My question is : is there a way to simply tell the red view to act as a whole so that setting its alpha would give something that looks like the wanted result (in the image)?

这是没有任何alpha的情况：

This is what it looks like without any alpha :

推荐答案

查看Info.plist可能的UIKit密钥，特别是 UIViewGroupOpacity 。

Check out the possible UIKit keys for Info.plist, specifically UIViewGroupOpacity.

UIViewGroupOpacity （布尔值 - iOS）指定Core Animation是否为
子图层继承其超级图层的不透明度。

UIViewGroupOpacity (Boolean - iOS) specifies whether Core Animation sublayers inherit the opacity of their superlayer.

Info.plist UIKit Keys

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