单视图heirachy中的UIView组不透明度 [英] UIView group opacity in single view heirachy

问题描述

我正在编写一个UI库，我希望能够拥有UIViews的alpha，就像设置了UIViewGroupOpacity info.plist一样。请参阅以下链接：

I am writing a UI library in which i would like to be able to have the alpha of the UIViews as if the UIViewGroupOpacity info.plist ket was set. See following links:

使UIView和子视图半透明为一层，而不是单独的

iOS控制子视图的UIView alpha行为

但是，就像我一样写一个lib，我不希望项目必须设置这个全局密钥，并影响主项目的行为。

But, as I am writing a lib, I dont want the projects to have to set this global key, and effect the behaviour of the main project.

还有其他方法可以实现吗？我不想遍历所有子视图并设置每个子视图的alpha，因为包含我的lib的项目可能启用了此键...

Is there any other way of achieving this? I dont want to cycle through all the subviews and set alpha of each subview, as the project that includes my lib might have this key enabled...

推荐答案

是的，您可以设置 shouldRasterize 。

Yes there is, you can set shouldRasterize of the view's layer.

containerView.layer.shouldRasterize = YES;
// Not setting rasterizationScale, will cause blurry images on retina displays:
containerView.layer.rasterizationScale = [[UIScreen mainScreen] scale];

这与 UIViewGroupOpacity 具有相同的效果但仅适用于 containerView 及其子视图。

This will have the same effect as UIViewGroupOpacity but only for containerView and it's subviews.

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