        }
    }
    
    var activityIndicator:UIActivityIndicatorView!
    
    override func viewDidLoad() {
        BBSListProvider.loadClasses()
        super.viewDidLoad()
        self.initHeaderView()
        self.footView.hidden = true
        tableView.tableFooterView = UIView()
        activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: .Gray)
        activityIndicator.center = CGPoint(x: tableView.frame.width/2, y: tableView.frame.height/2)
        self.tableView.addSubview(activityIndicator)
        BBSListProvider.loadTopicData(BBSListProvider.ClassIds[currentSelectPedia], page: currentPage) {