CODEWITHSUNDEEP
iphoneobjective-cioscocoa-touch
shajem
shajem

Reputation: 2121

Saving NSDictionary to NSUserDefaults

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];

Upvotes: 50

Views: 54445

Answers (2)

KkMIW
KkMIW

Reputation: 1112

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.

Upvotes: 7

yuji
yuji

Reputation: 16725

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];

Upvotes: 88

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