 
 public class HUD: UIView {
   let labelFont: CGFloat = 15
+  let backColor: UIColor = #colorLiteral(red: 0, green: 0, blue: 0, alpha: 1)
   
   static let sharedView = HUD()
   

  }
  
  private func buildMiddleView() {
    backView.backgroundColor = UIColor.black
    backView.alpha = 1
    backView.layer.cornerRadius = 15
    
    imageView.removeFromSuperview()

      imageView.layer.cornerRadius = 20
      imageView.layer.masksToBounds = true
      let view = UIView()
      view.backgroundColor = backColor
//      view.alpha = 1
      view.frame = CGRect(x: 2, y: 2, width: 36, height: 36)
      view.layer.cornerRadius = 18
      view.layer.masksToBounds = true
      imageView.addSubview(view)
    }
    /// 移除中心圆
