IOS列表实现动态多列

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//图片列表
NSMutableArray *pictureList;
//分组列表
NSMutableArray *indexArr;

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *picWallItemView = @"picWallItemView";
    UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:picWallItemView];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc]
                 initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, [self tableView:self.tableView heightForRowAtIndexPath:indexPath])] autorelease];
    }
    int num = [[indexArr objectAtIndex:indexPath.row] intValue];
    int index = 0;
    for (int i = 0; i < indexPath.row; i++) {
        index += [[indexArr objectAtIndex:i] intValue];
    }
    
    float tmpWidth = self.view.frame.size.width / num;
    float tmpHeight = [self tableView:self.tableView heightForRowAtIndexPath:indexPath];
    float left = 0;
    for (int i = 0; i < num; i ++) {
        left = i * tmpWidth;
        PicWallItemView *itemView = [[PicWallItemView alloc] initWithFrame:CGRectMake(left, 0, tmpWidth, tmpHeight)];
        itemView.delegate = self;
        NSDictionary *jsonDic = [pictureList objectAtIndex:index];
        PicWallItemTo *item = [PicWallItemTo fromDictionary:jsonDic];
        [itemView setIndentationWidth:5];
        [itemView reloadData:item];
        [cell addSubview:itemView];
        [itemView setFrame:CGRectMake(left, 0, tmpWidth, tmpHeight)];
        [itemView release];
        index++;
    }
    return cell;
}

在接收数据的地方，对数据进行分组。

        NSArray *arr = [obj objectForKey:MSG_DETALIST];
        
        NSUInteger total = [arr count];
        while (total > 0) {
            int num = arc4random() % 3 + 1;
            if(total > num){
                [indexArr addObject:[NSNumber numberWithInt:num]];
                total -= num;
            } else {
                [indexArr addObject:[NSNumber numberWithInt:total]];
                total = 0;
            }
        }