FBLoginView: login isn't performed

Question

I'm adding FBLoginView to my ViewController < FBLoginViewDelegate >:

FBLoginView *loginview = [[FBLoginView alloc] init];    
loginview.frame = CGRectOffset(loginview.frame, 5, 5);
loginview.delegate = self;    
[self.view addSubview:loginview];    
[loginview sizeToFit];

All the necessary fields in plist (FacebookAppID, FacebookDisplayName, URL Schemes) are all set according to the tutorial. The facebook app is also configured according to the tutorial (bundle ID is set, Facebook login is enabled).


But the login still isn't performed. When I press on "log in", I get redirected to the browser with facebook login, but when it's finished, I'm not logged in the app (loginViewFetchedUserInfo:user: isn't called, "log in" hasn't changed to "log out"). What can be the problem?

Answer 1

Everything worked after I implemented the following in the AppDelegate.m (taken from one of the official examples):

- (void)sessionStateChanged:(FBSession *)session
                      state:(FBSessionState) state
                      error:(NSError *)error
{
    switch (state) {
        case FBSessionStateOpen:
            if (!error) {
                // We have a valid session
                //NSLog(@"User session found");
                [FBRequestConnection
                 startForMeWithCompletionHandler:^(FBRequestConnection *connection,
                                                   NSDictionary<FBGraphUser> *user,
                                                   NSError *error) {
                     if (!error) {
                         self.loggedInUserID = user.id;
                         self.loggedInSession = FBSession.activeSession;
                     }
                 }];
            }
            break;
        case FBSessionStateClosed:
        case FBSessionStateClosedLoginFailed:
            [FBSession.activeSession closeAndClearTokenInformation];
            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];
    }
}

/*
 * Opens a Facebook session and optionally shows the login UX.
 */
- (BOOL)openSessionWithAllowLoginUI:(BOOL)allowLoginUI {
    return [FBSession openActiveSessionWithReadPermissions:nil
                                              allowLoginUI:allowLoginUI
                                         completionHandler:^(FBSession *session,
                                                             FBSessionState state,
                                                             NSError *error) {
                                             [self sessionStateChanged:session
                                                                 state:state
                                                                 error:error];
                                         }];
}

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

/*
 * If we have a valid session at the time of openURL call, we handle
 * Facebook transitions by passing the url argument to handleOpenURL
 */
- (BOOL)application:(UIApplication *)application
            openURL:(NSURL *)url
  sourceApplication:(NSString *)sourceApplication
         annotation:(id)annotation {
    // attempt to extract a token from the url
    return [FBAppCall handleOpenURL:url sourceApplication:sourceApplication];
}

Answer 2

You need to add the following to the app delegate

- (BOOL)application:(UIApplication *)application
        openURL:(NSURL *)url
  sourceApplication:(NSString *)sourceApplication
     annotation:(id)annotation {

  // Call FBAppCall's handleOpenURL:sourceApplication to handle Facebook app responses
  BOOL wasHandled = [FBAppCall handleOpenURL:url sourceApplication:sourceApplication];

  // You can add your app-specific url handling code here if needed

  return wasHandled;
}