过滤其他NSDictionary中的NSDictionary

Question

我有一本字典，里面有从解析JSON中提取的其他字典中的子词典。结构如下：

    {
        children =             (
                            {
                children =                     (
                                            {
                        hasArticles = 1;
                        hasWideIcon = 0;
                        label = biological;
                        urlId = 9950000123891;
                    },
                                            {
                        hasArticles = 1;
                        hasWideIcon = 0;
                        label = White;
                        urlId = 9950000123892;
                    },
                                            {
                        hasArticles = 1;
                        hasWideIcon = 0;
                        label = "various flavors";
                        urlId = 9950000123893;
                    },
                                            {
                        hasArticles = 1;
                        hasWideIcon = 0;
                        label = "different tastes creamy";
                        urlId = 9950000123894;
                    },
                                            {
                        hasArticles = 1;
                        hasWideIcon = 0;
                        label = "yogurt drinks";
                        urlId = 9950000123895;
                    },
                                            {
                        hasArticles = 1;
                        hasWideIcon = 0;
                        label = "Yogurt mix";
                        urlId = 9950000123896;
                    },
                                            {

                );
                hasArticles = 0;
                hasWideIcon = 0;
                label = "types of yogurt"; //those above are the children of the "types of yogurt" 
                urlId = 9950000123890;
            },


                            {
                children =                     (
                                            {
                        hasArticles = 1;
                        hasWideIcon = 0;
                        label = White;
                        urlId = 9950000123906;
                    },
                                            {
                        hasArticles = 1;
                        hasWideIcon = 0;
                        label = "various flavors";
                        urlId = 9950000123907;
                    },

                                            {
                        hasArticles = 1;
                        hasWideIcon = 0;
                        label = Pappareale;
                        urlId = 9950000123909;
                    }
                );
                hasArticles = 0;
                hasWideIcon = 0;
                label = "yogurt healthy"; //those above are the children of the yogurt healthy 
                urlId = 9950000123905;
            },

                            {
                hasArticles = 1;
                hasWideIcon = 0;
                label = "puddings and creams";
                urlId = 9950000123911;
            },
                            {
                hasArticles = 1;
                hasWideIcon = 0;
                label = "Snack dessert";
                urlId = 9950000123913;
            },
                            {
                hasArticles = 1;
                hasWideIcon = 0;
                label = "various Dessert";
                urlId = 9950000123914;
            }
        );
        hasArticles = 0;
        hasWideIcon = 0;
        label = "Yogurt and Dessert ";
        urlId = 9950000123889;
    },

我的代码

 -(void)connectionDidFinishLoading:(NSURLConnection *)connection{

        NSLog(@"%d", [webData length]);

       NSString *strResult =[[NSString alloc]initWithData:webData encoding:NSUTF8StringEncoding];
       NSDictionary *result =[strResult JSONValue];
           for (id obj in result){
                  NSLog(@"%@", result);
                  /*A part of the result is written above, but in reality is much 
                    longer and includes all possible products in a supermarket*/

           }

   }

如何提取"yogurtDessert“的子级

• 酸奶种类(谁有孩子)
• 酸奶-健康(谁有孩子)
• 布丁和奶油(没有孩子)
• 小吃甜点(没有孩子)
• 各种甜点(无子女)

那么，我该如何提取yogurtDessert孩子们事先不知道的信息呢？

我需要创建一个包含超市产品类别的字典数组(在本例中，只有酸奶和甜点，共有23个元素)，然后我必须创建另一组字典，每个字典包含每个产品的子类别，即数千个。我曾想过使用NSPredicate，但都是字典。我必须在其他字典中过滤字典。

Answer 1

字典的层次结构似乎包含两种类型的字典:代表一个类别的字典和作为产品的字典。

我在这里猜叶子字典(没有孩子)总是产品。拥有子键的字典总是分类的。这可能不是真的--看起来hasArticles对于产品是1，对于类别是0--但是，这还是未知的。

以下是提取所有产品的代码：

static void collectProducts(NSDictionary *dictionary, NSMutableArray *results)
{
    NSArray *children == dictionary[@"children"];

    if (children == nil) {
        [results addObject:dictionary];
        return;
    }

    for (NSDictionary *subDict in children)
        collectProducts(subDict, results);
}

NSArray *findProducts(NSDictionary *dictionary)
{
    NSMutableArray *result = [NSMutableArray array];
    collectProducts(dictionary, result);
    return array;
}

用您的JSON findProducts result调用result以获得所有的叶字典。