无法在SDK 3.2中保存Facebook accessToken

Question

I've been using the old Facebook SDK and saved the accessToken and expirationDate inside the NSUserDefaults . But now in the new Facebook SDK 3.2 there is a new class called FBAccessTokenData and I can take the accessToken from there by using:

[FBSession activeSession].accessTokenData.accessToken
[FBSession activeSession].accessTokenData.expirationDate

My problem is when I restart my app and click on Facebook button again, it goes to Facebook to ask for a new token although I used the app 3 minutes before, login into Facebook and got new token. So the token hasn't been saved.

I'm trying to save the new accessToken into [FBSession activeSession] but accessToken and expirationDate are readonly properties.

I've been reading the Facebook SDK documentation for few times now, searched stackOverflow and the web and still didn't got any clue how to do that.

This is my code:

- (void)sessionStateChanged:(FBSession *)session state:(FBSessionState) state error:(NSError *)error
{
    switch (state)
    {
        case FBSessionStateOpen:
        {
            // This is how i'm trying to save the token, like the old Facebook SDK.
            NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
            [defaults setObject:[FBSession activeSession].accessTokenData.accessToken forKey:@"FBAccessTokenKey"];
            [defaults setObject:[FBSession activeSession].accessTokenData.expirationDate forKey:@"FBExpirationDateKey"];
            [defaults synchronize];

            NSLog(@"FB: Session is open!");
        }
            break;

        case FBSessionStateClosed:
        case FBSessionStateClosedLoginFailed:
        {
            NSLog(@"FB: Session is closed or login failed");

            [self closeSession];
        }
            break;

        default:
            break;
    }

    [[NSNotificationCenter defaultCenter] postNotificationName:FBSessionStateChangedNotification
                                                        object:session];

    if (error)
    {
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Error"
                                                            message:error.localizedDescription
                                                           delegate:nil
                                                  cancelButtonTitle:@"OK"
                                                  otherButtonTitles:nil];
        [alertView show];
    }
}


- (void)openSession
{
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    [FBSession openActiveSessionWithReadPermissions:nil allowLoginUI:YES completionHandler:
     ^(FBSession *session, FBSessionState state, NSError *error)
    {
         [self sessionStateChanged:session state:state error:error];
    }];
}

- (void)closeSession
{
    [FBSession.activeSession closeAndClearTokenInformation];
}

Thanks in advance!

Answer 1

So I found the answer after searching more, If someone has problem with the new Facebook SDK 3.2 accessToken , look at this link . and you'll find what you are looking for.

Basically you create a class that handles the token saving and loading. Than you save it into local plist file - pretty easy and simple.

Enjoy! :)