iOS 10+ Corner radius

iOSCornerRadius.swift

import UIKit

extension UIRectCorner {
    func asCornerMask() -> CACornerMask {
        var corners: CACornerMask = []
        if self.contains(.bottomRight) {
            corners.insert(.layerMaxXMaxYCorner)
        }
        if self.contains(.topRight) {
            corners.insert(.layerMaxXMinYCorner)
        }
        if self.contains(.bottomLeft) {
            corners.insert(.layerMinXMaxYCorner)
        }
        if self.contains(.topLeft) {
            corners.insert(.layerMinXMinYCorner)
        }
        return corners
    }
}

extension UIView {
    func rounded(_ corners: UIRectCorner, radius: CGFloat) {
        if #available(iOS 11.0, *) {
            layer.cornerRadius = radius
            layer.maskedCorners = corners.asCornerMask()
        } else {
            guard !corners.contains(.allCorners) else {
                layer.cornerRadius = radius
                return
            }
            layer.cornerRadius = 0
            let mask = CAShapeLayer()
            mask.frame = self.bounds
            mask.path = UIBezierPath(
                roundedRect: self.bounds,
                byRoundingCorners:
                corners, cornerRadii: CGSize(width: radius, height: radius)
                ).cgPath
            self.layer.mask = mask
        }
    }
}