Hi Readers,

In any iPhone app if it is needed to iterate or remove NSUserDefault keys (as in logout feature), following code can be used:

To iterate key objects:

    NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];
    NSDictionary * dict = [defs dictionaryRepresentation];
    for (id key in dict) {
            //Here you can log the key
           NSLog(@"Key object= %@",[dict objectForKey:key]);
    }
    [defs synchronize];

To remove objects from keys:

NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];
    NSDictionary * dict = [defs dictionaryRepresentation];
    for (id key in dict) {
            //Here you can log the key
           [defs removeObjectForKey:key];
    }
    [defs synchronize];

Or for remove data from NSUserDefauls one can use simply following code as well:

NSString *appDomain = [[NSBundle mainBundle] bundleIdentifier];
[[NSUserDefaults standardUserDefaults] removePersistentDomainForName:appDomain];

HAPPY CODING :)