How to make sub view to be round corner as super view in iOS?

Question

I have set a view (light gray) to be round corner using:

layer.masksToBounds = false
layer.cornerRadius = 10

It works fine. But when a sub view (dark gray) was added, that subview is not round as its super view. How to make sub view to be round corner as super view?

Answer 1

在添加子视图时，请将masksToBounds设置为true ，

subView.masksToBounds = true

Answer 2

Try to add the cornerRadius to subview as well.

subview.layer.masksToBounds = false
subview.layer.cornerRadius = 10

Update

By using UIBezierPath we can add roundness to any corner we want.

subview.roundCorners([.topLeft, .topRight, .bottomRight], radius: 6)

Extension

extension UIView {
    func roundCorners(_ corners: UIRectCorner, radius: CGFloat) {
        let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
        let mask = CAShapeLayer()
        mask.path = path.cgPath
        self.layer.mask = mask
    }
}