How To Set Rounded Corner on View in Swift 4?

This tutorial to set corner radius on view, Round Left , Round Right , Round Top , and Round Bottom.

Create the extension on view.

extension UIView{
    func roundedTopLeft(){
        let maskPath1 = UIBezierPath(roundedRect: bounds,
                                     byRoundingCorners: [.topLeft],
                                     cornerRadii: CGSize(width: 15, height: 15))
        let maskLayer1 = CAShapeLayer()
        maskLayer1.frame = bounds
        maskLayer1.path = maskPath1.cgPath
        layer.mask = maskLayer1
    }

    func roundedTopRight(){
        let maskPath1 = UIBezierPath(roundedRect: bounds,
                                     byRoundingCorners: [.topRight],
                                     cornerRadii: CGSize(width: 15, height: 15))
        let maskLayer1 = CAShapeLayer()
        maskLayer1.frame = bounds
        maskLayer1.path = maskPath1.cgPath
        layer.mask = maskLayer1
    }
    func roundedBottomLeft(){
        let maskPath1 = UIBezierPath(roundedRect: bounds,
                                     byRoundingCorners: [.bottomLeft],
                                     cornerRadii: CGSize(width: 15, height: 15))
        let maskLayer1 = CAShapeLayer()
        maskLayer1.frame = bounds
        maskLayer1.path = maskPath1.cgPath
        layer.mask = maskLayer1
    }
    func roundedBottomRight(){
        let maskPath1 = UIBezierPath(roundedRect: bounds,
                                     byRoundingCorners: [.bottomRight],
                                     cornerRadii: CGSize(width: 15, height: 15))
        let maskLayer1 = CAShapeLayer()
        maskLayer1.frame = bounds
        maskLayer1.path = maskPath1.cgPath
        layer.mask = maskLayer1
    }
    func roundedBottom(){
        let maskPath1 = UIBezierPath(roundedRect: bounds,
                                     byRoundingCorners: [.bottomRight , .bottomLeft],
                                     cornerRadii: CGSize(width: 15, height: 15))
        let maskLayer1 = CAShapeLayer()
        maskLayer1.frame = bounds
        maskLayer1.path = maskPath1.cgPath
        layer.mask = maskLayer1
    }
    func roundedTop(){
        let maskPath1 = UIBezierPath(roundedRect: bounds,
                                     byRoundingCorners: [.topRight , .topLeft],
                                     cornerRadii: CGSize(width: 15, height: 15))
        let maskLayer1 = CAShapeLayer()
        maskLayer1.frame = bounds
        maskLayer1.path = maskPath1.cgPath
        layer.mask = maskLayer1
    }
    func roundedLeft(){
        let maskPath1 = UIBezierPath(roundedRect: bounds,
                                     byRoundingCorners: [.topLeft , .bottomLeft],
                                     cornerRadii: CGSize(width: 15, height: 15))
        let maskLayer1 = CAShapeLayer()
        maskLayer1.frame = bounds
        maskLayer1.path = maskPath1.cgPath
        layer.mask = maskLayer1
    }
    func roundedRight(){
        let maskPath1 = UIBezierPath(roundedRect: bounds,
                                     byRoundingCorners: [.topRight , .bottomRight],
                                     cornerRadii: CGSize(width: 15, height: 15))
        let maskLayer1 = CAShapeLayer()
        maskLayer1.frame = bounds
        maskLayer1.path = maskPath1.cgPath
        layer.mask = maskLayer1
    }
    func roundedAllCorner(){
        let maskPath1 = UIBezierPath(roundedRect: bounds,
                                     byRoundingCorners: [.topRight , .bottomRight , .topLeft , .bottomLeft],
                                     cornerRadii: CGSize(width: 15, height: 15))
        let maskLayer1 = CAShapeLayer()
        maskLayer1.frame = bounds
        maskLayer1.path = maskPath1.cgPath
        layer.mask = maskLayer1
    }
}

bottomRounded on UIView.

override func viewDidLoad() {

    let topRight = UIView(frame: CGRect(x: 120, y: 200, width: 120, height: 120))

     // Change here the function to set corner radius.
     topRight.roundedBottom()
     topRight.backgroundColor = .red
     self.view.center = topRight.center
     self.view.addSubview(topRight)
     super.viewDidLoad()
  }

topRound Corner on View.

override func viewDidLoad() {
    let topRight = UIView(frame: CGRect(x: 120, y: 200, width: 120, height: 120))
    topRight.roundedTop()
    topRight.backgroundColor = .red
    self.view.center = topRight.center
    self.view.addSubview(topRight)
    super.viewDidLoad()
}

leftRound Corner on View:

override func viewDidLoad() {
      let topRight = UIView(frame: CGRect(x: 120, y: 200, width: 120, height: 120))
      topRight.roundedLeft()
      topRight.backgroundColor = .red
      self.view.center = topRight.center
      self.view.addSubview(topRight)
      super.viewDidLoad()
  }

RightRound Corner on View :

override func viewDidLoad() {
    let topRight = UIView(frame: CGRect(x: 120, y: 200, width: 120, height: 120))
    topRight.roundedRight()
    topRight.backgroundColor = .red
    self.view.center = topRight.center
    self.view.addSubview(topRight)
    super.viewDidLoad()
}

topRight Corner on View :

override func viewDidLoad() {
    let topRight = UIView(frame: CGRect(x: 120, y: 200, width: 120, height: 120))
    topRight.roundedTopRight()
    topRight.backgroundColor = .red
    self.view.center = topRight.center
    self.view.addSubview(topRight)
    super.viewDidLoad()
}

topLeft Corner on View :

override func viewDidLoad() {
    let topRight = UIView(frame: CGRect(x: 120, y: 200, width: 120, height: 120))
    topRight.roundedTopLeft()
    topRight.backgroundColor = .red
    self.view.center = topRight.center
    self.view.addSubview(topRight)
    super.viewDidLoad()
}

bottomLeft Corner on View :

override func viewDidLoad() {
    let topRight = UIView(frame: CGRect(x: 120, y: 200, width: 120, height: 120))
    topRight.roundedBottomLeft()
    topRight.backgroundColor = .red
    self.view.center = topRight.center
    self.view.addSubview(topRight)
    super.viewDidLoad()
}

bottomRight Corner on View :

override func viewDidLoad() {
    let topRight = UIView(frame: CGRect(x: 120, y: 200, width: 120, height: 120))
    topRight.roundedBottomRight()
    topRight.backgroundColor = .red
    self.view.center = topRight.center
    self.view.addSubview(topRight)
    super.viewDidLoad()
}

Corner on View :

override func viewDidLoad() {
    let topRight = UIView(frame: CGRect(x: 120, y: 200, width: 120, height: 120))
    topRight.roundedAllCorner()
    topRight.backgroundColor = .red
    self.view.center = topRight.center
    self.view.addSubview(topRight)
    super.viewDidLoad()
}

Thanks.