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

extension UIView {

func roundCorners(_ corners: CACornerMask, radius: CGFloat) {
    if #available(iOS 11, *) {
        self.layer.cornerRadius = radius
        self.layer.maskedCorners = corners
    } else {
        var cornerMask = UIRectCorner()
        if(corners.contains(.layerMinXMinYCorner)){
            cornerMask.insert(.topLeft)
        }
        if(corners.contains(.layerMaxXMinYCorner)){
            cornerMask.insert(.topRight)
        }
        if(corners.contains(.layerMinXMaxYCorner)){
            cornerMask.insert(.bottomLeft)
        }
        if(corners.contains(.layerMaxXMaxYCorner)){
            cornerMask.insert(.bottomRight)
        }
        let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: cornerMask, cornerRadii: CGSize(width: radius, height: radius))
        let mask = CAShapeLayer()
        mask.path = path.cgPath
        self.layer.mask = mask
    }
}

}

Answer 2

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)

---

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)

Answer 3

1. Add RoundedCornerView.swift file to your project
2. Add an UIView to your ViewController
3. Change Custom Class in Identity Inspector to RoundedCornerView
4. Go to Attribute Inspector pick Corner Radius (CGFloat) and On the corners you want rounded.

RoundedCornerView.swift

import UIKit

@IBDesignable
class RoundedCornerView: UIView {

    var cornerRadiusValue : CGFloat = 0
    var corners : UIRectCorner = []

    @IBInspectable public var cornerRadius : CGFloat {
        get {
            return cornerRadiusValue
        }
        set {
            cornerRadiusValue = newValue
        }
    }

    @IBInspectable public var topLeft : Bool {
        get {
            return corners.contains(.topLeft)
        }
        set {
            setCorner(newValue: newValue, for: .topLeft)
        }
    }

    @IBInspectable public var topRight : Bool {
        get {
            return corners.contains(.topRight)
        }
        set {
            setCorner(newValue: newValue, for: .topRight)
        }
    }

    @IBInspectable public var bottomLeft : Bool {
        get {
            return corners.contains(.bottomLeft)
        }
        set {
            setCorner(newValue: newValue, for: .bottomLeft)
        }
    }

    @IBInspectable public var bottomRight : Bool {
        get {
            return corners.contains(.bottomRight)
        }
        set {
            setCorner(newValue: newValue, for: .bottomRight)
        }
    }

    func setCorner(newValue: Bool, for corner: UIRectCorner) {
        if newValue {
            addRectCorner(corner: corner)
        } else {
            removeRectCorner(corner: corner)
        }
    }

    func addRectCorner(corner: UIRectCorner) {
        corners.insert(corner)
        updateCorners()
    }

    func removeRectCorner(corner: UIRectCorner) {
        if corners.contains(corner) {
            corners.remove(corner)
            updateCorners()
        }
    }

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

}

github link : RoundedCornerView

Answer 4

You just need to mask the layer as shown below:

For Swift 3:

let rectShape = CAShapeLayer()
rectShape.bounds = self.myView.frame
rectShape.position = self.myView.center
rectShape.path = UIBezierPath(roundedRect: self.myView.bounds, byRoundingCorners: [.bottomLeft , .bottomRight , .topLeft], cornerRadii: CGSize(width: 20, height: 20)).cgPath

self.myView.layer.backgroundColor = UIColor.green.cgColor
//Here I'm masking the textView's layer with rectShape layer
self.myView.layer.mask = rectShape

Lower Version:

let rectShape = CAShapeLayer()
rectShape.bounds = self.myView.frame
rectShape.position = self.myView.center
rectShape.path = UIBezierPath(roundedRect: self.myView.bounds, byRoundingCorners: .BottomLeft | .BottomRight | .TopLeft, cornerRadii: CGSize(width: 20, height: 20)).CGPath

self.myView.layer.backgroundColor = UIColor.greenColor().CGColor
//Here I'm masking the textView's layer with rectShape layer
self.myView.layer.mask = rectShape

Answer 5

Swift 3

extension UIView {
    func roundCorners(_ 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
    self.layer.mask = mask
  }
}

Use like this

YourView.roundCorners([.topLeft, .bottomLeft], radius: 10)

Answer 6

Swift 4

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()
}

Output :

extension on UIView Swift 4 : Reference Link