ios - UIView的shadowpath颜色没有改变

Question

我有一个 UIView 并为其设置了一个 shadowPath ，如下所示:

func addShadow() {
    let cornerRadius: CGFloat = self.containerView.frame.height/2
    self.containerView.layer.shadowPath = UIBezierPath(roundedRect: self.containerView.frame, cornerRadius: cornerRadius).cgPath
    self.containerView.layer.shadowRadius = cornerRadius
    self.containerView.layer.shadowOffset = .zero
    self.containerView.layer.shadowOpacity = 0.2
    self.containerView.layer.cornerRadius = cornerRadius
    self.containerView.layer.shadowColor = UIColor(named: "whiteColor")?.cgColor
}

这是白色:

现在我的问题是

When I change the appearance of the phone, the shadowPath's color doesn't change automatically. What should I do to make the color dynamic?

Answer 1

所有图层属性不会自动对颜色变化使用react(由于转换为 CGColor)。

相反，当颜色外观发生变化时，对特征集合更改使用react并重新设置属性:

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

    if #available(iOS 13, *), self.traitCollection.hasDifferentColorAppearance(comparedTo: previousTraitCollection) {
        // re-set your properties here
    }
}