Performance scrolling and retina resolution images in CALayer

Question

I have a UIView that is placed as a subview in a UIScrollView. I have several child views made up of images, text, and buttons in the UIView. In order to get decent scrollin

Answer 1

I had a similar problem-- a rotated UIView with several UIImageView subviews. When I set the rasterizationScale = 2.0, the images became crisper, but this caused serration to reemerge. To fix this, I created a containerView that held the UIView and UIIMageViews (which were previously subviews of the UIView) and applied rasterizationScale = 1.0 to the UIView and rasterizationScale = 2.0 to the UIImageViews. Now everything looks quite nice.

Answer 2

@Jamie Hamick's answer in Swift 5:

myView.layer.rasterizationScale = UIScreen.main.scale

Answer 3

Seems I needed to set rasterizationScale to the proper value for the device as follows.

myView.layer.rasterizationScale = [[UIScreen mainScreen] scale];