Swift ----- 渐变颜色

    let view = UIView(frame: .init(x: 10, y: 100, width: 200, height: 100))
    self.view.addSubview(view)
    
    
    let gradientLayer = CAGradientLayer()
    gradientLayer.frame = view.frame
    gradientLayer.colors = [UIColor.red.cgColor,UIColor.yellow.cgColor]
    gradientLayer.locations = [0.1,0.4]
    gradientLayer.startPoint = CGPoint(x: 0, y: 0)
    gradientLayer.endPoint = CGPoint(x: 1, y: 1)
    view.layer.addSublayer(gradientLayer)