orignal

@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?
}
/*
private var shadowLayer: CAShapeLayer!
private var cornerRadius: CGFloat = 25.0
private var fillColor: UIColor = .blue // the color applied to the shadowLayer, rather than the view's backgroundColor
override func layoutSubviews() {
super.layoutSubviews()
if shadowLayer == nil {
shadowLayer = CAShapeLayer()
shadowLayer.path = UIBezierPath(roundedRect: bounds, cornerRadius: cornerRadius).cgPath
shadowLayer.fillColor = fillColor.cgColor
shadowLayer.shadowColor = UIColor.black.cgColor
shadowLayer.shadowPath = shadowLayer.path
shadowLayer.shadowOffset = CGSize(width: 0.0, height: 1.0)
shadowLayer.shadowOpacity = 0.2
shadowLayer.shadowRadius = 3
layer.insertSublayer(shadowLayer, at: 0)
}
}
view rawAddShadowAndRoundedCorners.swift hosted with :heart: by GitHub
*/