swift - 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 = UIColor.redColor().CGColor
    rectShape.bounds = messages.frame
    rectShape.position = messages.center
    rectShape.path = UIBezierPath(roundedRect: messages.bounds, byRoundingCorners: .BottomLeft | .TopRight, cornerRadii: CGSize(width: 20, height: 20)).CGPath

    messages.layer.addSublayer(rectShape)

this code create two rect. I dont know why.

Answer 1

(swift 4/iOS 11) Just simply say for bottom:

yourView.clipsToBounds = true 
yourView.layer.cornerRadius = 10
yourView.layer.maskedCorners = [.layerMaxXMaxYCorner, .layerMinXMaxYCorner]

for Up:

yourView.clipsToBounds = true 
yourView.layer.cornerRadius = 10
yourView.layer.maskedCorners = [.layerMaxXMinYCorner, .layerMinXMinYCorner]

in your case:

yourView.layer.maskedCorners = [.layerMaxXMaxYCorner, .layerMinXMaxYCorner, .layerMinXMinYCorner]

Hope this help :)