UIRefreshControlを追加した

//設置

_refreshControl = [[UIRefreshControl alloc] init];
    
[_refreshControl addTarget:self action:@selector(refresh) forControlEvents:UIControlEventValueChanged];

//tableviewに追加
[self.tableView addSubview:_refreshControl];

- (void)refresh
{
    //tableをリロードする
    [self.tableView reloadData];
    [NSTimer scheduledTimerWithTimeInterval:1.f target:self selector:@selector(endRefresh) userInfo:nil repeats:NO];

}

- (void)endRefresh
{
    [_refreshControl endRefreshing];
}