class GradientView: UIView {

    private let colors: [CGColor]
    private let gradientLayer = CAGradientLayer()

    init(colors: [UIColor]) {
        self.colors = colors.map { $0.cgColor }
        super.init(frame: .zero)
        setupView()
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    private func setupView() {
        backgroundColor = UIColor.clear
    }

    override func draw(_ rect: CGRect) {
        gradientLayer.frame = rect
        gradientLayer.cornerRadius = rect.size.height / 2.0
        gradientLayer.colors = colors
        layer.addSublayer(gradientLayer)
    }
}