Round Top Corners of a UIButton in Swift

Question

I know I can round all four corners using:

 myBtn.layer.cornerRadius = 8
 myBtn.layer.masksToBounds = true

Since I only want to round two,

Answer 1

iOS 11 has made it really easy to round corners. The code below rounds the top left and bottom right corners.

myView.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMaxYCorner]