Round cornered view with border

RoundCornerViewWithBorder.swift

import UIKit

extension UIView {
    func configureBorder(_ roundCorners:UIRectCorner, cornerRadius: CGFloat, borderColor: UIColor, borderWidth: CGFloat) {
        let path = UIBezierPath(roundedRect: bounds,
                                byRoundingCorners: roundCorners,
                                cornerRadii: CGSize(width: cornerRadius, height: cornerRadius))
        let mask = CAShapeLayer()
        mask.path = path.cgPath
        mask.borderColor = UIColor.white.cgColor
        layer.mask = mask
        
        let border = CAShapeLayer()
        border.path = path.cgPath
        border.lineWidth = borderWidth
        border.strokeColor = borderColor.cgColor
        border.fillColor = UIColor.clear.cgColor
        layer.addSublayer(border)
        
        clipsToBounds = true
    }
}

let view = UIView(frame: CGRect(x: 0, y: 0, width: 300, height: 300))
view.backgroundColor = UIColor.red
view.configureBorder([.bottomLeft, .bottomRight], cornerRadius: 30, borderColor: .green, borderWidth: 4)