objective-c - NSMutableDictionary 添加子项

Question

关于如何获取 NSMutableDictionary 并使其成为另一个我似乎无法理解的 NSMutableDictionary 的子元素，肯定缺少一些关键元素。我已经尝试了几乎所有方法，并且开始认为跳桥可能会解决问题。

当前:

DICT:1 root
          |_main dict

DICT:2 root
          |_dict [A]
               |
               sub dict...

期望:

DICT:1 root
         |_main dict
                   |_dict [A]
                        |
                        sub dict....

每当我尝试将“DICT:2”添加到“DICT:1”时，它都会覆盖主词典。留给我:

DICT:1 root
          |_dict [A]
               |
               sub dict...

我尝试了很多事情，包括:

NSMutableDictionary *myDict = [[NSMutableDictionary alloc] init];

[myDict setObject:@"mainDict" forKey:@"mainDict"];
[myDict setObject:@"dictA" forKey:@"mainDict"];

也尝试过:

NSMutableDictionary *myDict = [[NSMutableDictionary alloc] init];

[myDict addEntriesFromDictionary:dictA];

NSMutableDictionary *moarDict = [myDict objectForKey:@"mainDict"];
[moarDict addEntriesFromDictionary:dictA];

和:

moarDict = [dictA mutableCopy];

呃! NSMutableDictionary 一定讨厌我，因为毫无疑问我讨厌它。

Answer 1

试试这个:

NSMutableDictionary *myDict = [[NSMutableDictionary alloc] init];
NSMutableDictionary *mainDict = [[NSMutableDictionary alloc] init];
[myDict setObject:mainDict forKey:@"mainDict"];
[myDict[@"mainDict"] setObject:dictA" forKey:@"dictA"];

这会导致

myDict
    | mainDict
            | dictA
                 | sub dict