Round Top Corners of a Uiview 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)
    }
}

How to round top two corners of UIView and add shadow above?

SWIFT 5: iOS 11 introduced maskedCorners which results in smoother and better quality results. You can still use the UIRectCorner in the function call and have it translated to CACornerMask:

extension UIView {

    func roundCorners(_ corners: UIRectCorner, radius: CGFloat) {
        if #available(iOS 11.0, *) {
            clipsToBounds = true
            layer.cornerRadius = radius
            layer.maskedCorners = CACornerMask(rawValue: corners.rawValue)
        } else {
            let path = UIBezierPath(
                roundedRect: bounds, 
                byRoundingCorners: corners, 
                cornerRadii: CGSize(width: radius, height: radius)
            )
            let mask = CAShapeLayer()
            mask.path = path.cgPath
            layer.mask = mask
        }
    }

    func addShadow(shadowColor: CGColor = UIColor.label.cgColor,
                   shadowOffset: CGSize = CGSize(width: 1.0, height: 2.0),
                   shadowOpacity: Float = 0.4,
                   shadowRadius: CGFloat = 3.0) {
        self.layer.shadowColor = shadowColor
        self.layer.shadowOffset = shadowOffset
        self.layer.shadowOpacity = shadowOpacity
        self.layer.shadowRadius = shadowRadius
        self.layer.masksToBounds = false
    }
}

These functions need to be applied in layoutSubviews() of your superview.

override func layoutSubviews() {
     roundCorners([.topLeft, .topRight], radius: 15)
     addShadow(shadowColor: UIColor.text1.cgColor, shadowOffset: CGSize(width: 0, height: -3), shadowOpacity: 0.2, shadowRadius: 5)
}

Round top corners of a UIView and add border

The mask layer doesn't get drawn, just used to compute the mask. Try:

-(void)roundCorners:(UIRectCorner)corners radius:(CGFloat)radius
{
    CGRect bounds = self.bounds;
    UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:bounds
                                                   byRoundingCorners:corners
                                                         cornerRadii:CGSizeMake(radius, radius)];

    CAShapeLayer *maskLayer = [CAShapeLayer layer];
    maskLayer.frame = bounds;
    maskLayer.path = maskPath.CGPath;

    self.layer.mask = maskLayer;

    CAShapeLayer*   frameLayer = [CAShapeLayer layer];
    frameLayer.frame = bounds;
    frameLayer.path = maskPath.CGPath;
    frameLayer.strokeColor = [UIColor redColor].CGColor;
    frameLayer.fillColor = nil;

    [self.layer addSublayer:frameLayer];
}

-(void)roundTopCornersRadius:(CGFloat)radius
{
    [self roundCorners:(UIRectCornerTopLeft|UIRectCornerTopRight) radius:radius];
}

-(void)roundBottomCornersRadius:(CGFloat)radius
{
    [self roundCorners:(UIRectCornerBottomLeft|UIRectCornerBottomRight) radius:radius];
}

The frame you're currently seeing drawn is the UITextField's normal frame, so set the frame style to none. You'll also have to adjust the insets to make up for the fact that with the frame style set to none there's normally no inset.

How can you make a UIView with rounded top corners and square bottom corners

I read this post a while ago:

Just two rounded corners?

and also this follow-up post:

Round two corners in UIView

I think these should answer your question.

Giving UIView rounded corners

Try this

#import <QuartzCore/QuartzCore.h> // not necessary for 10 years now  :)

...

view.layer.cornerRadius = 5;
view.layer.masksToBounds = true;

Note: If you are trying to apply rounded corners to a UIViewController's view, it should not be applied in the view controller's constructor, but rather in -viewDidLoad, after view is actually instantiated.

How to add corner radius for UIView

You shouldn't use a mask for this, you can simply use the layer.maskedCorners property.

layer.cornerRadius = r
layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]

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