Saving NSDictionary to NSUserDefaults

Question

I have a NSMutableDictionary, and i have added values to it (several key pair values). Now i require to save this NSMutableDictionary to a NSUserDefaults object.

1.

Answer 1

NSMutableDictionary *profileDictionary = [[NSMutableDictionary  alloc] init];
[profileDictionary setObject:txt_Username.text forKey:@"USERNAME_KEY"];
[profileDictionary setObject:txt_Password forKey:@"PASSWORD_KEY"];
[[NSUserDefaults standardUserDefaults] setObject:profileDictionary forKey:@"PROFILE_KEY"];
[[NSUserDefaults standardUserDefaults] synchronize];

This is what you expected.

Answer 2

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];