GradientView.swift

class GradientView: UIView {
    var gradientLayer: CAGradientLayer!

    override init(frame: CGRect) {
        super.init(frame: frame)
        commonInit()
    }

    required init?(coder: NSCoder) {
        super.init(coder: coder)
        commonInit()
    }

    private func commonInit() {
        gradientLayer = CAGradientLayer()
        gradientLayer.frame = bounds
        gradientLayer.colors = [UIColor(red:0.29, green:0.23, blue:0.54, alpha:1.0).cgColor, UIColor(red:0.50, green:0.35, blue:0.74, alpha:1.0).cgColor, UIColor(red:0.64, green:0.63, blue:0.66, alpha:1.0).cgColor]
        gradientLayer.colors = [UIColor.red.cgColor, UIColor.yellow.cgColor]
        gradientLayer.startPoint = CGPoint(x: 0.0, y: 0.5)
        gradientLayer.endPoint = CGPoint(x: 1.2, y: 1.0)
        layer.insertSublayer(gradientLayer, at: 0)
    }

    override func layoutSubviews() {
        super.layoutSubviews()
        gradientLayer.frame = bounds
    }
}