ios - 标题未显示在 UIButton 渐变 View 上

Question

我有一个渐变类附加到我的 UIButton 并且渐变显示正常。但是，UIButton 的标题或文本未显示。渐变似乎覆盖了文本。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
        }
    }
}

不知道是什么问题。我将此代码用于另一个项目并且显示良好。谢谢

Answer 1

您忘记在 layoutSubviews() 中调用 super.layoutSubviews()。

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