ios - UIButton Gradient View 上未显示标题

Question

我的 UIButton 附加了一个渐变类，渐变显示效果很好。但是，没有显示 UIButton 的标题或文本。似乎渐变覆盖了文本。这是我的代码：

@IBDesignable
class GradientView: UIButton {

    @IBInspectable var topColor: UIColor = #colorLiteral(red: 1, green: 0.0318463631, blue: 0, alpha: 1) {
        didSet {
            self.setNeedsLayout()
        }
    }

    @IBInspectable var bottomColor: UIColor = #colorLiteral(red: 1, green: 0.4265971184, blue: 0, alpha: 1) {
        didSet {
            self.setNeedsLayout()
        }
    }

    override func layoutSubviews() {
        let gradientLayer = CAGradientLayer()
        gradientLayer.colors = [topColor.cgColor, bottomColor.cgColor]
        gradientLayer.startPoint = CGPoint(x: 0, y: 0.5)
        gradientLayer.endPoint = CGPoint(x: 1, y: 0.5)
        gradientLayer.frame = self.bounds
        gradientLayer.cornerRadius = layer.cornerRadius
        self.layer.insertSublayer(gradientLayer, at: 0)
    }
            //Rounded Button Functions
    @IBInspectable var cornerRadius : CGFloat = 3.0 {
        didSet {
            self.layer.cornerRadius = cornerRadius
        }
    }

    override func awakeFromNib() {
        self.setupView()
    }

    override func prepareForInterfaceBuilder() {
        super.prepareForInterfaceBuilder()
        self.setupView()
    }


    func setupView() {
        self.layer.cornerRadius = cornerRadius
    }

    @IBInspectable var border : CGFloat = 1.0 {
        didSet {
            self.layer.borderWidth = border
        }
    }

    @IBInspectable var borderColor: UIColor? {
        get {
            return UIColor(cgColor: layer.borderColor!)
        }
        set {
            layer.borderColor = newValue?.cgColor
        }
    }
}

我不知道问题是什么。我将此代码用于另一个项目，它显示得很好。谢谢

标签： iosswift

Answer 1

你忘记打电话super.layoutSubviews()了layoutSubviews()。

override func layoutSubviews() {
    super.layoutSubviews()
    // your code
}