将渐变应用于按钮不会迅速反映答案

【问题标题】：Applying Gradient to button doesn't reflect in swift将渐变应用于按钮不会迅速反映
【发布时间】：2019-07-30 10:38:10
【问题描述】：

我写了以下代码，不知道我做错了什么按钮没有反映渐变

我也尝试在 awakefromNib 下调用我的函数

class ButtonGradient: UIButton {

    var color1 = #colorLiteral(red: 0.3411764801, green: 0.6235294342, blue: 0.1686274558, alpha: 1)
    var color2 = #colorLiteral(red: 0.521568656, green: 0.1098039225, blue: 0.05098039284, alpha: 1)

    var gradient = CAGradientLayer()

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

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        applyGradient()

    }


    func applyGradient() {

        gradient.frame = self.bounds
        gradient.colors = [color1,color2]
        gradient.startPoint = CGPoint.zero
        gradient.endPoint = CGPoint.init(x: 0.0, y: 0.5)
        gradient.locations = [0,1]
        self.layer.addSublayer(gradient)


    }
}

我想将渐变垂直应用到我的按钮。

【问题讨论】：

标签： ios swift xcode uibutton

【解决方案1】：

很简单，给你

    @IBDesignable class GradientButton: UIButton {

    @IBInspectable var topColor: UIColor = .white
    @IBInspectable var bottomColor: UIColor = .black

    override class var layerClass: AnyClass {
        return CAGradientLayer.self
    }

    override func layoutSubviews() {
        (layer as? CAGradientLayer)?.colors = [topColor.cgColor, bottomColor.cgColor]
    }

}

只需将类从 UIButton 更改为 GradientButton

【讨论】：

我在自定义类 func applyGradient(colors : [Any]) { gradient.frame = self.bounds gradient.colors = colors gradient.startPoint = CGPoint.zero gradient.endPoint = CGPoint. init(x: 0.0, y: 0.9) gradient.locations = [0,1] self.layer.addSublayer(gradient) self.layer.cornerRadius = self.frame.height / 2 self.clipsToBounds = true }