swift 渐变背景

Posted 2021-05-19

func backgroundGradientMode() {
        let gradientLayer = CAGradientLayer.init()
        gradientLayer.frame = backgroundGradient.bounds
        gradientLayer.colors = [
            UIColor.init(red: 0, green: 0, blue: 0, alpha: 0).cgColor,
            UIColor.init(red: 0, green: 0, blue: 0, alpha: 0.2).cgColor,
            UIColor.init(red: 0, green: 0, blue: 0, alpha: 0.3).cgColor,
            UIColor.init(red: 0, green: 0, blue: 0, alpha: 0.5).cgColor,
            UIColor.init(red: 0, green: 0, blue: 0, alpha: 1).cgColor
        ]
        gradientLayer.startPoint = CGPoint(x: 0, y: 0)
        gradientLayer.endPoint = CGPoint(x: 0, y: 1)
        backgroundGradient.layer.mask = gradientLayer;
    }