iphone - ios中UITableview中的下拉菜单使用缩进级别

Question

在这里，我想要一个Multilevel tableview。I was able to create it successfully but when one of the levels is selected, any previously expanded dropdown level should collapse. 我使用了下面的示例代码。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = (UITableViewCell *)[tableView dequeueReusableCellWithIdentifier:@"cellid"];
    if (cell==nil){
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cellid"] autorelease];
    }
    [cell setSelectionStyle:UITableViewCellSelectionStyleNone];
    [cell.textLabel setText:[[arrtable objectAtIndex:indexPath.row] objectForKey:@"name"]];
    [cell setIndentationLevel:[[[arrtable objectAtIndex:indexPath.row] objectForKey:@"level"] intValue]];

    return cell;
}

什么时候选择行

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    NSLog(@"arrtable :%@",arrtable);


    NSDictionary *d=[arrtable objectAtIndex:indexPath.row];
    NSLog(@"d%@",d);
    if([d valueForKey:@"objects"]) {

        NSArray *ar=[d valueForKey:@"objects"];

        BOOL isAlreadyInserted=NO;

        for(NSDictionary *dInner in ar ){
            NSInteger index=[arrtable indexOfObjectIdenticalTo:dInner];
            isAlreadyInserted=(index>0 && index!=NSIntegerMax);
            if(isAlreadyInserted) break;
        }

        if(isAlreadyInserted) {
            [self miniMizeThisRows:ar];
        } else {
            NSUInteger count=indexPath.row+1;
            NSMutableArray *arCells=[NSMutableArray array];
            for(NSDictionary *dInner in ar ) {
                [arCells addObject:[NSIndexPath indexPathForRow:count inSection:0]];
                [arrtable insertObject:dInner atIndex:count++];
            }
            [tableView insertRowsAtIndexPaths:arCells withRowAnimation:UITableViewRowAnimationLeft];
        }
    }
}

- (void)miniMizeThisRows:(NSArray*)ar{
    for(NSDictionary *dInner in ar ) {
        NSUInteger indexToRemove=[arrtable indexOfObjectIdenticalTo:dInner];
        NSArray *arInner=[dInner valueForKey:@"objects"];
        if(arInner && [arInner count]>0){
            [self miniMizeThisRows:arInner];
        }
        if([arrtable indexOfObjectIdenticalTo:dInner]!=NSNotFound) {
            [arrtable removeObjectIdenticalTo:dInner];
            [testtable deleteRowsAtIndexPaths:[NSArray arrayWithObject:
                                                    [NSIndexPath indexPathForRow:indexToRemove inSection:0]
                                                    ]
                                  withRowAnimation:UITableViewRowAnimationRight];
        }
    }
}

这里我有一个示例图像：只有我需要选择其中一个选项