学步园

    //默认选中行，放在 reloadData 后
    NSIndexPath *ip=[NSIndexPath indexPathForRow:0 inSection:2];
    [tableView selectRowAtIndexPath:ip animated:YES scrollPosition:UITableViewScrollPositionBottom];
    NSIndexPath *path=[NSIndexPath indexPathForItem:0 inSection:2];
    [self tableView:tableView didSelectRowAtIndexPath:path];