ios - 如何设置渐变颜色以在深色模式下查看 ios？

Question

我想在暗模式下更改渐变颜色。但它没有改变。设置 View 后设置渐变。在明暗模式之间切换时颜色不会改变。

 if let layer = layer as? CAGradientLayer {
        if let startGradientColor = startGradientColor, let endGradientColor = endGradientColor {
            layer.colors = [startGradientColor.cgColor, endGradientColor.cgColor]
        } else {
            layer.colors = gradientColors.map {$0.cgColor}
        }
        layer.startPoint = CGPoint(x: 0, y: 0)  // top
        layer.endPoint = CGPoint(x: 1, y: 1)    // bottom
    }

Answer 1

您需要让您的应用程序对特征集合的更改使用react，如下所示:

extension YourViewController {
    override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
        super.traitCollectionDidChange(previousTraitCollection)

        if #available(iOS 13.0, *) {
            guard traitCollection.hasDifferentColorAppearance(comparedTo: previousTraitCollection) else {
                return
            }

            // redraw your layers here
        }
    }
}