ios - 如果设置角半径则不会应用阴影

Question

我正在尝试向左下角和右下角添加圆角半径，并为其添加阴影。但由于某种原因，如果我添加这些角半径，阴影就会消失。是什么原因造成的？

这就是我所做的:

我有扩展:

extension UIView {
    func roundCorners(_ corners: UIRectCorner, radius: CGFloat) {
        self.layoutIfNeeded()
        let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
        let mask = CAShapeLayer()
        mask.path = path.cgPath
        self.layer.mask = mask
    }
}

应用角点:

myView.roundCorners([.bottomLeft, .bottomRight], 半径: 35)

添加阴影扩展:

func addShadow(offset: CGSize, color: UIColor, radius: CGFloat, opacity: Float) {
    let layer = self.layer
    layer.masksToBounds = false
    layer.shadowOffset = offset
    layer.shadowColor = color.cgColor
    layer.shadowRadius = radius
    layer.shadowOpacity = opacity
    layer.shadowPath = UIBezierPath.init(roundedRect: layer.bounds, cornerRadius: layer.cornerRadius).cgPath

    let backgroundCGColor = self.backgroundColor?.cgColor
    self.backgroundColor = nil
    layer.backgroundColor =  backgroundCGColor
}

并添加阴影:

myView.addShadow(offset: CGSize.init(width: 0.0, height: 10.0) , color: UIColor.blue, radius: 35.0, opacity: 1.0)

为什么添加圆角后阴影消失了？

Answer 1

myView.layer.shadowPath 需要使用 UIBezierPath 进行初始化。只需给它与 myView 相同的框架和边界即可。