MJRefresh上拉刷新下拉加载

1.创建

//下拉刷新
    _headerView = [MJRefreshHeaderView header];
    _headerView.scrollView = _tbView;
    _headerView.delegate = self;
    
    //上拉加载更多
    _footerView = [MJRefreshFooterView footer];
    _footerView.scrollView = _tbView;
    _footerView.delegate = self;
    
    [_headerView beginRefreshing];

2.下载成功后停止下载

//修改下载状态
        _isLoading = NO;
        [_headerView endRefreshing];
        [_footerView endRefreshing];

3.释放

-(void)dealloc
{
    _headerView.scrollView = nil;
    _footerView.scrollView = nil;
}