Saving NSDictionary to NSUserDefaults

Your code is correct, but the one thing you have to keep in mind is that NSUserDefaults doesn’t distinguish between mutable and immutable objects, so when you get it back it’ll be immutable:

NSDictionary *retrievedDictionary = [[NSUserDefaults standardUserDefaults] dictionaryForKey:@"DicKey"];

If you want a mutable dictionary, just use mutableCopy:

NSMutableDictionary *mutableRetrievedDictionary = [[[NSUserDefaults standardUserDefaults] objectForKey:@"DicKey"] mutableCopy];