#pragma mark 编辑操作（删除或添加）//实现了此方法向左滑动就会显示删除（或添加）图标-(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath{        NTContactGroup * group = _contacts[indexPath.section];    NTContact * contact = group.contacts[indexPath.row];    if (editingStyle == UITableViewCellEditingStyleDelete) {        [group.contacts removeObject:contact];        [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationBottom];        if (group.contacts.count == 0) {            [_contacts removeObject:group];            [tableView reloadData];        }    }else if (editingStyle == UITableViewCellEditingStyleInsert){                NTContact * addContact = [[NTContact alloc]init];        addContact.firstName = @"Guan";        addContact.lastName = @"yu";        addContact.mobileNumber = @"12345678901";        [group.contacts insertObject:addContact atIndex:indexPath.row];        [tableView insertRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationBottom];    }}

实现二维数组的删除某一行