UIViewを丸型に切り取る

切り取る

class ViewController: UIViewController {

    @IBOutlet weak var baseView: UIView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // 切り取りたい CGRectを指定
        let rect = CGRect(x: 120, y: 10, width: 100, height: 100)
        baseView.cutOutCircle(rect: rect)
    }
}

extension UIView {
    public final func cutOutCircle(rect: CGRect) {
        let maskLayer = CAShapeLayer()
        maskLayer.frame = self.bounds
        let path = UIBezierPath(rect: self.bounds)
        path.append(UIBezierPath(ovalIn: rect))
        maskLayer.fillRule = .evenOdd
        maskLayer.path = path.cgPath
        self.layer.mask = maskLayer
    }
}

結果