iOS 设置tableview的下拉刷新问题

显示刷新结果的label总是跟着最上方的那个cell动,请问怎么设置才能让这个label固定在navigationitem后面,等label需要时再出来

 - (void)viewDidLoad {
    [super viewDidLoad];
    self.navigationItem.title = @"通知公告";

    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(addAnnouce)];

    self.tableView.showsVerticalScrollIndicator = NO;
    self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
    self.tableView.backgroundColor = [UIColor colorWithRed:240.0 / 255.0 green:240.0 / 255.0 blue:240.0 / 255.0 alpha:1];

    UILabel *tipLabel = [[UILabel alloc] initWithFrame:CGRectMake(0,0, SCREEN_WIDTH, 40)];
    tipLabel.textAlignment = NSTextAlignmentCenter;
    tipLabel.backgroundColor = RGBCOLOR(250.0f, 250.0f, 250.0f);
    tipLabel.textColor = MAINCOLOR;
    tipLabel.font = [UIFont systemFontOfSize:15];

    [self.tableView  addSubview:tipLabel];
    self.tipLabel = tipLabel;

    UIRefreshControl *refreshControl = [[UIRefreshControl alloc] init];
    self.refreshControl = refreshControl;
    [refreshControl addTarget:self action:@selector(reloadData:) forControlEvents:UIControlEventValueChanged];
    refreshControl.tintColor = MAINCOLOR;

    [refreshControl beginRefreshing];
    [self reloadData:refreshControl];

}

代码是tableview视图的viewdidload方法,这个设置刷新的label总是会跟着cell...

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