递归遍历未知结构的NSDictionary

Question

有没有人对未知结构的NSDictionary进行递归有序遍历？我想采用任何NSDictionary并按层次顺序处理每个级别.

1)此数据来自经过验证的JSON.可以肯定地说,从诸如SBJSON(JSON框架)之类的框架创建的NSDictionary只会导致嵌套字典,数组和任意叶子的组合？

2)如何使用适用于数组和字典的快速枚举来完成泛型遍历？使用下面的代码,一旦我到达数组中的字典,它就会停止遍历.但是,如果我继续数组条件中的递归(以检查数组中的字典),它会在下一次id value = [dict valueForKey:key];使用-[__NSCFDictionary length]: unrecognized selector sent to instanceSIGABRT的迭代时进行barfs.我不知道为什么这会是一个问题,因为我已经超过了顶级字典的那一行(其中找到了子级字典的数组).

-(void)processParsedObject:(id)dict counter:(int)i parent:(NSString *)parent
{
    for (id key in dict) {
        id value = [dict valueForKey:key];
        NSLog(@"%i : %@ : %@ -> %@", i, [value class], parent, key);

        if ([value isKindOfClass:[NSDictionary class]])
        {
            i++;
            NSDictionary* newDict = (NSDictionary*)value;
            [self processParsedObject:newDict counter:i parent:(NSString*)key];
            i--;
        }
        else if ([value isKindOfClass:[NSArray class]])
        {
            for (id obj in value) {
                NSLog(@"Obj Type: %@", [obj class]);
            }
        }
    }
}

非常感谢

Answer 1

我做了类似的事情,我将遍历来自Web服务的JSON结构化对象,并将每个元素转换为可变版本.

- (void)processParsedObject:(id)object
{
    [self processParsedObject:object depth:0 parent:nil];
}

- (void)processParsedObject:(id)object depth:(int)depth parent:(id)parent
{      
    if ([object isKindOfClass:[NSDictionary class]])
    {
        for (NSString* key in [object allKeys])
        {
            id child = [object objectForKey:key];
            [self processParsedObject:child depth:(depth + 1) parent:object];
        }
    }
    else if ([object isKindOfClass:[NSArray class]])
    {
        for (id child in object)
        {
            [self processParsedObject:child depth:(depth + 1) parent:object];
        }   
    }
    else
    {
        // This object is not a container you might be interested in it's value
        NSLog(@"Node: %@  depth: %d", [object description], depth);
    }
}