Round Top Corners of a UIButton in Swift

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Swift 4: For latest iOS 11 onwards

override func viewDidLoad() {
    super.viewDidLoad()

    if #available(iOS 11.0, *) {
        self.viewToRound.clipsToBounds = true
        viewToRound.layer.cornerRadius = 20
        viewToRound.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]
    } else {
        // Fallback on earlier versions
    }
}

Earlier iOS (10,9 etc) Versions (works for iOS 11 too)

override func viewDidLayoutSubviews() {
    self.viewToRound.clipsToBounds = true
    let path = UIBezierPath(roundedRect: viewToRound.bounds,
                            byRoundingCorners: [.topRight, .topLeft],
                            cornerRadii: CGSize(width: 20, height: 20))

    let maskLayer = CAShapeLayer()

    maskLayer.path = path.cgPath
    viewToRound.layer.mask = maskLayer
}

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