ios - 过滤其他 NSDictionary 中的 NSDictionary

Question

我有一本字典，其中包含从解析 JSON 中提取的其他字典中的子项。 结构如下所示:

    {
        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*/

           }

   }

我如何提取“yogurtDessert”的 child

• 酸奶的种类(有 child 的)
• yogurt-healty(有 child )
• 布丁和奶油(没有 child )
• 点心甜品(不含 child )
• 各种甜点(不含 child )

我如何提取事先不知道的 yogurtDessert 的 child ？

我需要创建一个包含超市产品类别的字典数组(在这个例子中只有酸奶和甜点，总共 23 个元素)，然后我必须创建另一个字典数组，每个字典包含子类别每件产品，即数千件。我考虑过使用 NSPredicate 但是是字典。 我必须在其他词典中过滤一个词典

Answer 1

字典的层次结构似乎包含两种类型的字典:代表类别的字典和代表产品的字典。

我在这里猜测叶子字典(没有 child )总是产品。具有子键的字典始终是类别。这可能不是真的——看起来 hasArticles 是 1 代表产品，0 代表类别——但同样，这是未知的。

这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;
}

使用您的 JSON result 调用 findProducts 以获取所有叶字典。