IOS列表实现动态多列

、

 //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(, , self.view.frame.size.width, [self tableView:self.tableView heightForRowAtIndexPath:indexPath])] autorelease];
     }
     int num = [[indexArr objectAtIndex:indexPath.row] intValue];
     int index = ;
     for (int i = ; 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 = ;
     for (int i = ; i < num; i ++) {
         left = i * tmpWidth;
         PicWallItemView *itemView = [[PicWallItemView alloc] initWithFrame:CGRectMake(left, , tmpWidth, tmpHeight)];
         itemView.delegate = self;
         NSDictionary *jsonDic = [pictureList objectAtIndex:index];
         PicWallItemTo *item = [PicWallItemTo fromDictionary:jsonDic];
         [itemView setIndentationWidth:];
         [itemView reloadData:item];
         [cell addSubview:itemView];
         [itemView setFrame:CGRectMake(left, , 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 > ) {
             int num = arc4random() %  + ;
             if(total > num){
                 [indexArr addObject:[NSNumber numberWithInt:num]];
                 total -= num;
             } else {
                 [indexArr addObject:[NSNumber numberWithInt:total]];
                 total = ;
             }
         }