Rounded Corner View

// define

extension UIView {

    func roundCorners(corners:UIRectCorner, radius: CGFloat) {

        DispatchQueue.main.async {

            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

        }

    }

}

// using

bubbleView.roundCorners(corners: [.topLeft, .bottomRight, .topRight], radius: 21)




https://www.appcoda.com/bezier-paths-introduction/