刷新控件

    //添加下拉刷新
    MJRefreshNormalHeader*freshHeader=[MJRefreshNormalHeader headerWithRefreshingTarget:self refreshingAction:@selector(reloadingDataWhenPullToFollow)];
    freshHeader.lastUpdatedTimeLabel.hidden=YES;
    _myTableView.mj_header=freshHeader;
    
    
    
    // 添加上拉刷新

    _myTableView.mj_footer = [MJRefreshAutoNormalFooter footerWithRefreshingTarget:self refreshingAction:@selector(reloadingDataWhenpullToTop)];