我有一个数组字典，其中还包含字典。我想删除最里面字典里的一个关键字。做这件事最简单、最快的方法是什么。
只需访问内部字典，就好像它不在字典中的数组中一样。
例如：
[[[settingsDictionary objectForKey:@"key1"] objectAtIndex:index] removeObjectForKey:@"key2"];
或更分散：
NSArray *innerArray = [topDict objectForKey:@"key1"];
NSMutableDictionary *innerDict = [innerArray objectAtIndex:index];
[innerDict removeObjectForKey:@"key2"];
或者使用新的下标表示法：
[settingsDictionary[@"key1"][index] removeObjectForKey:@"key2"];
我真的没有什么特别的方法可以做到这一点，只需访问对象并调用removeObjectForKey方法。
我认为对于这个结构，没有其他方法可以获得数组的键，然后是数组中的索引和要删除的元素的键。
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