Rounded Corners only on Top of a UIView

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)).CGPathlayer.mask = maskLayer

Swift 2.x

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

Swift 3.x

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

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!!

Modern & Easy solution

iOS 11+

Now we have the maskedCorners property on the view's layer & it makes life much easier.

Just set your desired corner radius and specify which corners should be masked. The best part is that this plays well with borders - the layer border will follow the edge of the layer whether it's rounded or not! Try the following code in a playground (remember to open the live view by pressing command+option+return so you can see what it looks like)

import UIKitimport PlaygroundSupportlet wrapperView = UIView(frame: CGRect(x: 0, y: 0, width: 400, height: 160))wrapperView.backgroundColor = .lightGraylet roundedCornerView = UIView(frame: CGRect(x: 50, y: 50, width: 300, height: 60))roundedCornerView.backgroundColor = .whitewrapperView.addSubview(roundedCornerView)roundedCornerView.layer.cornerRadius = 10roundedCornerView.layer.borderColor = UIColor.red.cgColorroundedCornerView.layer.borderWidth = 1// this is the key part - try out different corner combinations to achieve what you needroundedCornerView.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]PlaygroundPage.current.liveView = wrapperView

Here's what it looks like: