Question

So I am using the NSUserDefaults to store my FBAccessTokenKey and FBExpirationDateKey. I am creating a singleton User object:

- (id)init
{
    self = [super init];
    if (self != nil) {
         facebook = [[Facebook alloc] initWithAppId:kAppId andDelegate:self];

         NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
         if ([defaults objectForKey:@"FBAccessTokenKey"] 
            && [defaults objectForKey:@"FBExpirationDateKey"] ) {
            NSLog(@"ACCESS KEY IS NOT EMPTY");
            facebook.accessToken = [defaults objectForKey:@"FBAccessTokenKey"];
            facebook.expirationDate = [defaults objectForKey:@"FBExpirationDateKey"];
         } else {
              NSLog(@"ACCESS KEY IS EMPTY");
         }


    }
    return self;
}

I also have implemented a didLogout method that is called when I logout:

- (void)fbDidLogout {
    [[NSUserDefaults standardUserDefaults] removeObjectForKey:@"FBAccessTokenKey"];
    [[NSUserDefaults standardUserDefaults] removeObjectForKey:@"FBExpirationDateKey"];
}

This basically clears/flushes out the token key.
Now the real issue is that when I click on logout, quit the app, and then run the app again, it detects that the key FBAccessTokenKey and FBExpirationDateKey is still there. Why is this?

Answer 1

you should call: [[NSUserDefaults standardUserDefaults] synchronize] before exit