Round Top Corners of a Uibutton in Swift

Round Top Corners of a UIButton in Swift

Adding Extension of UIButton:

extension UIButton{
    func roundedButton(){
        let maskPath1 = UIBezierPath(roundedRect: bounds,
            byRoundingCorners: [.topLeft , .topRight],
            cornerRadii: CGSize(width: 8, height: 8))
        let maskLayer1 = CAShapeLayer()
        maskLayer1.frame = bounds
        maskLayer1.path = maskPath1.cgPath
        layer.mask = maskLayer1
    }
}

Calling in viewDidAppear/viewDidLayoutSubviews:

btnCorner.roundedButton()

Button Corner OutPut:

Round Top Corners of a UIView in Swift

Solved this with the help of @Paolo and below is the working code.

Swift 3.2

extension UIView {

    func roundCorners(corners:UIRectCorner, radius: CGFloat) {

        DispatchQueue.main.async {
            let path = UIBezierPath(roundedRect: self.bounds,
                                    byRoundingCorners: corners,
                                    cornerRadii: CGSize(width: radius, height: radius))
            let maskLayer = CAShapeLayer()
            maskLayer.frame = self.bounds
            maskLayer.path = path.cgPath
            self.layer.mask = maskLayer
        }
    }
}

for calling this function use below line and mention which corners you want to round

self.myView.roundCorners(corners: [.topLeft, .topRight, .bottomLeft, .bottomRight], radius: 8.0)

How to set cornerRadius for only top-left and top-right corner of a UIView?

Pay attention to the fact that if you have layout constraints attached to it, you must refresh this as follows in your UIView subclass:

override func layoutSubviews() {
    super.layoutSubviews()
    roundCorners(corners: [.topLeft, .topRight], radius: 3.0)
}

If you don't do that it won't show up.

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And to round corners, use the extension:

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

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Additional view controller case: Whether you can't or wouldn't want to subclass a view, you can still round a view. Do it from its view controller by overriding the viewWillLayoutSubviews() function, as follows:

class MyVC: UIViewController {
    /// The view to round the top-left and top-right hand corners
    let theView: UIView = {
        let v = UIView(frame: CGRect(x: 10, y: 10, width: 200, height: 200))
        v.backgroundColor = .red
        return v
    }()
    
    override func loadView() {
        super.loadView()
        view.addSubview(theView)
    }
    
    override func viewWillLayoutSubviews() {
        super.viewWillLayoutSubviews()

        // Call the roundCorners() func right there.
        theView.roundCorners(corners: [.topLeft, .topRight], radius: 30)
    }
}

Editing UIButton to have rounded corners on one side

try this:

extension UIView {
    func roundCorners(_ corners: UIRectCorner, radius: CGFloat, borderColor: UIColor?, borderWidth: CGFloat?) {
        let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))

        let mask = CAShapeLayer()
        mask.frame = self.bounds
        mask.path = path.cgPath
        self.layer.mask = mask

        if borderWidth != nil {
            addBorder(mask, borderWidth: borderWidth!, borderColor: borderColor!)
        }
    }

    private func addBorder(_ mask: CAShapeLayer, borderWidth: CGFloat, borderColor: UIColor) {
        let borderLayer = CAShapeLayer()
        borderLayer.path = mask.path
        borderLayer.fillColor = UIColor.clear.cgColor
        borderLayer.strokeColor = borderColor.cgColor
        borderLayer.lineWidth = borderWidth
        borderLayer.frame = bounds
        layer.addSublayer(borderLayer)
    }
}

usage:

someView.roundCorners([.topLeft, .topRight], radius: 3, borderColor: nil, borderWidth: nil) //top corners with radius 3 without border
someView.roundCorners(.allCorners, radius: 2, borderColor: UIColor.red, borderWidth: 1) //all corners with red border

you can apply this to any UI element, that inherits UIView (for example UIButton)

Round top corners of UIImageView like a UIButton

Use this value:

imageView([.TopLeft, .TopRight], radius: 20)

Round left border of a UIButton

Solved it! It was because my button.layer.borderWidth = 3 was drawing a really thick rectangle, so I couldn't see the border drawn by roundBtnCorners

I deleted the line below:

button.layer.borderWidth = 3

Result:

How to round the corners of a button

I tried the following solution with the UITextArea and I expect this will work with UIButton as well.

First of all import this in your .m file -

#import 

and then in your loadView method add following lines

    yourButton.layer.cornerRadius = 10; // this value vary as per your desire
    yourButton.clipsToBounds = YES;

How can I make a button have a rounded border in Swift?

Use button.layer.cornerRadius, button.layer.borderColor and button.layer.borderWidth.
Note that borderColor requires a CGColor, so you could say (Swift 3/4):

button.backgroundColor = .clear
button.layer.cornerRadius = 5
button.layer.borderWidth = 1
button.layer.borderColor = UIColor.black.cgColor

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