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:一个红色视图包含两个白色视图.我将红色容器视图的 alpha 更改为 0.3，这发生了(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).
看到这一点，我只能假设(如果我错了请告诉我)设置视图的 alpha 也会设置其所有子视图的 alpha.我的问题是:有没有一种方法可以简单地告诉红色视图作为一个整体运行，以便设置它的 alpha 会给出看起来像想要的结果(在图像中)的东西?
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 的样子:
This is what it looks like without any alpha :
推荐答案
查看 Info.plist 可能的 UIKit 键，特别是 UIViewGroupOpacity.
Check out the possible UIKit keys for Info.plist, specifically UIViewGroupOpacity.
UIViewGroupOpacity (Boolean - iOS) 指定是否核心动画子层继承其上层的不透明度.
UIViewGroupOpacity (Boolean - iOS) specifies whether Core Animation sublayers inherit the opacity of their superlayer.
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