UIView group opacity in single view heirachy

Question

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:

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Answer 1

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];

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

Answer 2

For iOS 7.0 and later:

Since iOS 7.0, this can be controlled for each CALayer individually through the allowsGroupOpacity property. By setting it to YES, you get the same behavior as if UIViewGroupOpacity was set, but just for that particular layer.