Rounded Corners only on Top of a UIView

Just tried with Swift 3.0 , Xcode 8.0:

REMEMBER to set your button in viewDidLayoutSubviews() or layoutSubViews as @rob described here .

And when you wanna change your button background, you just need to call:

yourButton.backgroundColor = UIColor.someColour

Source:

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()

    yourButton.layer.masksToBounds = true
    yourButton.roundCorners(corners: [.topLeft,.topRight], radius: 5)
}

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

• Here is the result:

Default state:

Seleted state:

Hope this help!!

You can do this by setting a mask on your view's layer:

CAShapeLayer * maskLayer = [CAShapeLayer layer];
maskLayer.path = [UIBezierPath bezierPathWithRoundedRect: self.bounds byRoundingCorners: UIRectCornerTopLeft | UIRectCornerTopRight cornerRadii: (CGSize){10.0, 10.}].CGPath;

self.layer.mask = maskLayer;

IMPORTANT: You should do this in your view's layoutSubviews() method, so the view has already been resized from the storyboard

---

In Swift <= 1.2

let maskLayer = CAShapeLayer()
maskLayer.path = UIBezierPath(roundedRect: bounds, byRoundingCorners: .TopLeft | .TopRight, cornerRadii: CGSize(width: 10.0, height: 10.0)).CGPath

layer.mask = maskLayer

---

Swift 2.x

let maskLayer = CAShapeLayer()
maskLayer.path = UIBezierPath(roundedRect: bounds, byRoundingCorners: UIRectCorner.TopLeft.union(.TopRight), cornerRadii: CGSizeMake(10, 10)).CGPath
layer.mask = maskLayer

---

Swift 3.x

let maskLayer = CAShapeLayer()
maskLayer.path = UIBezierPath(roundedRect: view.bounds, byRoundingCorners: [.topLeft, .topRight], cornerRadii: CGSize(width: 10, height: 10)).cgPath
layer.mask = maskLayer