Retrieve key for a given value in an NSDictionary

Question

I'm trying to avoid creating multiple dictionaries, one where the key is the value, and another where the value is the key.

So I can easily look for a value if I have the key by doing

[self.myDic objectForKey: word];

But is there a way to go through the values and see if it matches word, and if it does, then give me the key? Or do I have to iterate through the whole thing?

Answer 1

You can get the keys matching the value with allKeysForObject. Your dictionary could have more than one key for the same object.

Answer 2

you can get all the keys with yourDict.allKeys and iterate them until you find the right object .

   for (NSString* key in yourDict.allKeys) {
        if([yourDict objectForKey:key] isEqualToString:@"somethinghere object/other equalitu"){
            return key;
        }
    }