SVProgressHUD的使用

  开始请求，HUD展示
  SVProgressHUD.show()
 请求成功后，HUD消失
  DispatchQueue.main.async {
                    SVProgressHUD.dismiss()
                }
  成功处理
                        DispatchQueue.main.asyncAfter(deadline: DispatchTime.now()+0.2, execute: {
                            SVProgressHUD.showInfo(withStatus: "取消收藏成功！")
                            SVProgressHUD.dismiss(withDelay: 0.5)
                        })