iPad 3 shouldRasterize = YES makes UILabel text cut off

Question

I have a problem when setting shouldRasterize to YES on layer. On iPad3, the label.text has the text cut off from the bottom for about 1/5 of the size. Anyone know what's the problem is?.

    cellview.layer.cornerRadius = 12.0;
    cellview.layer.borderColor = [UIColor blackColor].CGColor;
    cellview.layer.borderWidth = 1.0;
    cellview.layer.frame = rect;
    cellview.layer.shouldRasterize =YES;
    cellview.layer.masksToBounds = YES;

On iPad 2, it works fine.

Answer 1

Set the rasterization's scale, because of iPad3's retina display:

[cellview.layer setRasterizationScale:[[UIScreen mainScreen] scale]];

Answer 2

Swift version:

cellview.layer.rasterizationScale = UIScreen.main.scale