round corner

@IBDesignable
class RoundedView: UIView {
   @IBInspectable
   var topCornersRounded: Bool = false {
       didSet {
           if self.topCornersRounded {
               layer.maskedCorners = [.layerMaxXMinYCorner, .layerMinXMinYCorner]
           }
       }
   }
   @IBInspectable
   var bottomCornersRounded: Bool = false {
       didSet {
           if self.bottomCornersRounded {
               layer.maskedCorners = [.layerMaxXMaxYCorner, .layerMinXMaxYCorner]
           }
       }
   }
   @IBInspectable
   var allCornerRounded: Bool = false {
       didSet {
           if self.allCornerRounded {
               layer.maskedCorners = [.layerMaxXMaxYCorner, .layerMinXMaxYCorner, .layerMaxXMinYCorner, .layerMinXMinYCorner]
           }
       }
   }
   @IBInspectable
   var cornerRad: CGFloat = 0 {
       didSet {
           layer.cornerRadius = cornerRad
       }
   }
   override init(frame: CGRect) {
       super.init(frame: frame)
   }
   required init?(coder aDecoder: NSCoder) {
       super.init(coder: aDecoder)
       clipsToBounds = true
       topCornersRounded = false
       bottomCornersRounded = false
       allCornerRounded = false
   }
   private var theShadowLayer: CAShapeLayer?
}