iOS: Get Facebook Access Token with Auto-Login

Question

I'm using Parse and Facebook for account management in my app. Whenever the user logs in through the facebook button, my code works perfectly because facebook sdk automatically generates a new access token. However, if I use an autologin code which checks whether user has already approved of the app, I have no access token and can't access facebook data for that user. I don't know how to request an access token for a user who has already agreed to use my app.

Loading data:

- (void)_loadData :(BOOL)updateData
{
    NSLog(@"entered _loadData");
    NSMutableDictionary* userInfoParams = [NSMutableDictionary dictionary];
    [userInfoParams setValue:@"id,name,email,gender" forKey:@"fields"];

    if([FBSDKAccessToken currentAccessToken])
    {
        NSLog(@"Expiration date of token: %@", [[FBSDKAccessToken currentAccessToken] expirationDate]);
    }
    else NSLog(@"No access token");


    FBSDKGraphRequest *request = [[FBSDKGraphRequest alloc] initWithGraphPath:@"me" parameters:userInfoParams];
    [request startWithCompletionHandler:^(FBSDKGraphRequestConnection* connection, id result, NSError* error)
     {
         if(!error)
         {
             ...
         }
      }
}

Auto-login system:

 (void)viewDidAppear:(BOOL)animated
{
    if ([PFUser currentUser] || [PFFacebookUtils isLinkedWithUser:[PFUser currentUser]])
    {
        NSLog(@"Yes");
        [self _loadData:YES];
        [self transitionToLoginSegue:(id)self];
    }
    else NSLog(@"No");
}

Also, the access tokens I receive when user clicks through the log in button last for 4 weeks, so if there was a way to manually assign an access token then I could do that, however [FBSDKAccessToken currentAccessToken] is not assignable so I can't do that either.

Answer 1

This is my code below,

 if ([self check_network])
      {

      START_LOAD;
      FBSDKLoginManager *login = [[FBSDKLoginManager alloc] init];
      [login
       logInWithReadPermissions:  @[@"public_profile",@"email",@"user_friends"]
       fromViewController:self
       handler:^(FBSDKLoginManagerLoginResult *result, NSError *error) {
             if (error) {
                   STOP_LOAD;
                   NSLog(@"Process error");
                   NSLog(@"%@",error);
                   TOAST_FOR_TRY_AGAIN;
                   /*
                   UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Please Try Again"
                                                                 message:nil
                                                                delegate:self
                                                       cancelButtonTitle:@"Ok"
                                                       otherButtonTitles: nil];
                   [alert show];
                    */
             } else if (result.isCancelled)
             {
                    STOP_LOAD;
                   NSLog(@"Cancelled");
             } else
             {
                   NSLog(@"Logged in");
                   NSLog(@"Result=%@",result);

                   [[[FBSDKGraphRequest alloc] initWithGraphPath:@"me" parameters:@{ @"fields": @"id,first_name,middle_name,last_name,name,picture,email"}]
                    startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection, id result, NSError *error)
                    {
                          NSLog(@"Facebook result=%@",result);
                         if (!error)
                             {
                                [NSUSER setObject:result forKey:@"user_info"];
                                [NSUSER setObject:[result objectForKey:@"name"] forKey:@"skip_name"];
                                [NSUSER synchronize];

                                API_CALL_ALLOC(ls_apicall);
                                [ls_apicall Login: STRING([result objectForKey:@"id"])];

                          } else {
                                 STOP_LOAD;
                                NSLog(@"An error occurred getting friends: %@", [error localizedDescription]);
                          }
                    }];
             }
       }];
      }
      else
      {
            TOAST(TOAST_NETWORK_ERROR);
      }