ios - iOS 无法设置 UIView 的底部阴影？

Question

我想设置 UIView 的底部阴影。我还设置圆角半径。如果我将 ma​​skToBounds 设置为 true 那么我无法设置UIView请告诉我如何设置UIView的角半径和阴影。

 func addShadwToView(){
    self.viewContainer.layer.masksToBounds = true;
    self.viewContainer.layer.shadowRadius = 15;
    self.viewContainer.layer.shadowOffset = CGSize(width: 0, height: 20)
    self.viewContainer.layer.shadowOpacity = 0.5;
    self.viewContainer.layer.cornerRadius = 5
    self.viewContainer.layer.borderColor = UIColor.lightGray.cgColor
    self.viewContainer.layer.borderWidth = 0.5
  }

Answer 1

如果您同时想要角半径和投影，请不要打开 -masksToBounds，而是设置角半径并使用圆角矩形设置阴影的贝塞尔曲线路径。保持两者的半径相同:尝试一下:

func addShadwToView(){
                    var borderLine = CAShapeLayer()
                    borderLine.path =  UIBezierPath(roundedRect: frame2, byRoundingCorners: [.allCorners], cornerRadii: CGSize(width: 30, height: 0)).cgPath
                    borderLine.shadowColor = UIColor.white.cgColor
                    borderLine.shadowOffset = CGSize(width: 0, height: 1)
                    borderLine.shadowOpacity = 0.3
                    borderLine.shadowRadius = 10

                    self.viewContainer.layer.masksToBounds = true;
                    self.viewContainer.layer.cornerRadius = 5
                    self.viewContainer.layer.borderColor = UIColor.lightGray.cgColor
                    self.viewContainer.layer.borderWidth = 0.5
                    self.viewContainer.layer.addSublayer(borderLine)
                }