ios - 设置圆角半径隐藏 UIView

Question

我创建了这个扩展来快速向任何 UIView 添加圆角:

extension UIView {
    func setCorners(corners: UIRectCorner, radius: CGFloat) {
        print(self.frame) //-> (359.0, 0.0, 306.0, 37.0)
        let maskPath = UIBezierPath(roundedRect: self.frame, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: 0.0))
        let maskLayer = CAShapeLayer()
        maskLayer.path = maskPath.cgPath
        self.layer.mask = maskLayer
        print(self.frame) //-> (359.0, 0.0, 306.0, 37.0)
    }
}

我用来创建 View 和圆角的代码:

let view = UIView(frame: CGRect(origin: CGPoint.zero, size: CGSize(width: 100, height: 40))) //I reposition the view later
view.setCorners(corners: [.bottomLeft, .bottomRight], radius: 8)

当注释掉 setCorners(corners:radius:) 时， View 出现，否则保持隐藏状态。

知道为什么会这样吗？

Answer 1

看来，您需要在 UIBezierPath(roundedRect: self.frame, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: 0.0)) 中使用 self.bounds 而不是 self.frame