     }
     
     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
        })
    }

    // MARK: - Life Cycle
    override func viewDidLoad() {
        super.viewDidLoad()
        
        setupUserInterface()
        loadClassDetail()
