swift - 为什么 UIViews 背景颜色没有更新？

Question

Switch 语句有效，但不会重置 View 背景颜色等。

我有一个 UIImage (图标)和一个 UIButton 嵌入在 UIView (自定义类型 DropShadowCircleView )如下图所示。

点击步行按钮时，var navigationOption 将设置为 步行 或 驾驶 以及 setupNavigationSelectionView() > 已执行。

问题是:开关的“步行”情况下工作正常，但“驾驶”情况下不会重置 UIView 和图标颜色恢复到原来的设置，例如；背景颜色等...有什么想法吗？

func setupNavigationSelectionView(){

        switch navigationOption {

        case "walking":
            walkingBg.setGradientBackground(colourOne: softGreen, ColourTwo: softBlue)
            walkingBg.layer.cornerRadius = walkingBg.frame.width / 2
            walkingBg.clipsToBounds = true
            walkingIcon.tintColor = #colorLiteral(red: 0, green: 0, blue: 0, alpha: 1)

        case "driving":
            walkingBg.backgroundColor = #colorLiteral(red: 0, green: 0, blue: 0, alpha: 1)
            walkingBg.layer.cornerRadius = walkingBg.frame.width / 2
            walkingBg.clipsToBounds = true
            walkingIcon.tintColor = #colorLiteral(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)

        default:
            break

        }
}

编辑:这是我的DropShadowCircleView类

class DropShadowCircleView: UIView {

    override func awakeFromNib() {

        setupView()
        super.awakeFromNib()

    }

    func setupView(){
        self.layer.shadowOpacity = 0.50
        self.layer.shadowRadius = 20
        self.layer.shadowColor = UIColor.black.cgColor
        self.layer.cornerRadius = self.frame.width / 2


    }

}

编辑:这是我的setGradientBackground函数，它位于UIView

的扩展文件中

func setGradientBackground(colourOne: UIColor, ColourTwo: UIColor) {

        let gradientLayer = CAGradientLayer()
        gradientLayer.frame = bounds
        gradientLayer.colors = [colourOne.cgColor, ColourTwo.cgColor]
        gradientLayer.locations = [0.0, 1.0]
        gradientLayer.startPoint = CGPoint(x: 1.0, y: 1.0)
        gradientLayer.endPoint = CGPoint(x: 0.0, y: 0.0)

        layer.insertSublayer(gradientLayer, at: 0)
    }

Answer 1

重置图标时，您需要删除渐变层。

将此添加到您的扩展 UIView:

func removeGradientBackground() {
    guard
        let idx = layer.sublayers?.index(where: { $0 is CAGradientLayer })
        else { return }

    layer.sublayers?.remove(at: idx)
}

并在重置图标时调用它。