如何使用目标 c 从 json 获取 collectionview 单元格中的图像

问：

self->SCImageArr = [[NSMutableArray alloc]init];
            self->SCLabelArr = [[NSMutableArray alloc]init];

            NSDictionary *SCDic = [maindic objectForKey:@"specialcategories"];
            for (NSDictionary *SCDictionary in SCDic){
                NSString *strimage = [SCDictionary objectForKey:@"image"];
                [self->SCImageArr addObject:strimage];
                NSLog(@"SCImage :%@", strimage);  
                NSString *strname = [SCDictionary objectForKey:@"text"];
                [self->SCLabelArr addObject:strname];
                NSLog(@"SClabelname :%@", strname);
            } 
            [self.specialCategoriesCollectionView reloadData];

我的手机代码在这里

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{

    static NSString *CellIndentifer = @"Cell";
    SpecialCategoriesCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:CellIndentifer forIndexPath:indexPath];

    cell.categoriesImages.image = [UIImage imageWithData:SCImageArr];
    cell.categoriesNameLabel.text = self.specialCategoriesLabel[indexPath.row];

    return cell;
}

如何使用目标 c 从 json 获取 collectionview 单元格中的图像？