how to set cornerRadius for only bottom-left,bottom-right and top-left corner textview?

Question

How to set corner radius only only bottom-left,bottom-right and top-left corner textview?

let rectShape = CAShapeLayer()
    rectShape.backgroundColor = UICo         


        

Answer 1

Swift 4+

func roundCorners(with CACornerMask: CACornerMask, radius: CGFloat) {
          self.layer.cornerRadius = radius
          self.layer.maskedCorners = [CACornerMask]
    }

Top right

roundCorners(with: [.layerMinXMinYCorner], radius: 20)

Top left

roundCorners(with: [.layerMaxXMinYCorner], radius: 20)

Bottom right

roundCorners(with: [.layerMinXMaxYCorner], radius: 20)

Bottom left

roundCorners(with: [.layerMaxXMaxYCorner], radius: 20)

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OR

Multiple corners at the same time

    func roundedCorners(corners : UIRectCorner, radius : CGFloat) {
        let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
        let mask = CAShapeLayer()
        mask.path = path.cgPath
        layer.mask = mask
    }

How to use

roundedCorners(corners: [.topLeft, .topRight], radius: 20)