UITableView load content while scrolling

gistfile1.txt

- (void) tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
    // somecode
    [self performSelectorInBackground:@selector(loadMoreData:) withObject:nil];
}

- (void) loadMoreData:(id) s {
    // some code to pull data from remote
    dispatch_async(dispatch_get_main_queue(), ^{
      [self.tableView reloadData];
    });
}