UIView的阴影路径颜色不变 [英] UIView's shadowpath color doesn't change

问题描述

我有一个UIView，并为此设置了shadowPath:

I have a UIView and I set a shadowPath for it like this:

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whiteColor:

现在我的问题是

当我更改手机的外观时，shadowsPath color不会自动更改.我该怎么做才能使颜色动态?

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

推荐答案

所有图层属性都不会自动响应颜色变化(由于转换为CGColor).

All layer properties don't react to color changes automatically (due to the conversion to CGColor).

相反，当颜色外观更改时，对特征集更改做出反应并重新设置属性:

Instead, react to trait collection changes and re-set the properties when the color appearance changes:

override open func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
    if #available(iOS 13, *), self.traitCollection.hasDifferentColorAppearance(comparedTo: previousTraitCollection) {
        // re-set your properties here
    }
}

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