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.) My code as follows; I am not sure if it is correct , and also i need to know how to retrieve the NSMutableDictionary from the NSUSerDefault ?

2.) After retrieving the NSMutableDictionary i need to save it to a NSDictionary. How could i do these ?

NSMutableDictionary *dic = [[NSMutableDictionary  alloc] init];  [dic addObject:@"sss" forKey:@"hi"]; [dic addObject:@"eee" forKey:@"hr"];   [NSUserDefaults standardDefaults] setObject:dic forKey:@"DicKey"];  [[NSUserDefaults standardDefaults] synchronize]; 

Answer 1

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];