     }
     
     private func loadClassDetail() {
+        
+        ThemeHUD.showActivityIndicator()
+        
         getLiveClassDetail(classId, failureHandler: { (reason, errorMessage) in
             ThemeHUD.hideActivityIndicator()
             defaultFailureHandler(reason, errorMessage: errorMessage)

            }
        }, completion: { [weak self] (model) in
            ThemeHUD.hideActivityIndicator()
            println("编号：\(model.id) - \(model.isPaid)")
            self?.model = model
        })
    }

        // 验证是否已登陆
        if !MalaUserDefaults.isLogined {
            let loginController = LoginViewController()
            loginController.popAction = { [weak self] in
                self?.loadClassDetail()
            }
            self.present(
                UINavigationController(rootViewController: loginController),
                animated: true,
