Facebook iOS SDK Logout

Question

I'm using the official and updated Facebook iOS SDK.
We're developing an application on an iPad that is used inside a physical store using an in-house distribution profile. Where customers can login to their Facebook account on an iPad that's publicly available to improve their shopping experience.

The problem I came across is that when a user logs into their Facebook account, the next user (customer) will still be logged in with the previous users' credentials (You have already authorized xxx, Press "Okay" to continue). Ofcourse this is not okay.

Is there a way to actually logout (sign off, clear credentials, or what ever) the previous (or current) user so the next user can fill in its own username and password.

Unfortunately [[FBSession activeSession] closeAndClearTokenInformation] doesn't quite do the trick.

This is a part of the code so far:

 // .... 
 [[FBSession activeSession] closeAndClearTokenInformation];
 [FBSession.activeSession openWithCompletionHandler:^(FBSession *session,
                                                         FBSessionState state,
                                                         NSError *error) {
      // More code ...

  }];
// ...

PS. The cookie 'workaround' doesn't work for me (obviously)

How are you authenticating the user? via iOS, Facebook app or Safari? — Alejandro Benito-Santos, Nov 20 '12 at 17:21

score 8 · Accepted Answer · answered Nov 20 '12 at 21:48

From your context, I'm assuming your device(s) does not have the Facebook app installed nor do you expect to use iOS 6 system authentication which would leave the default login behavior to use Safari. If you were to clear the Safari cookies, that should work but for a smoother experience in your scenario you should use the FBSession openWithBehavior:completionHandler: method and specify a behavior of FBSessionLoginBehaviorForcingWebview so that it uses the inline webview dialog for authentication.

See the SwitchUserSample in the Facebook iOS SDK for an example since that sample demonstrates an app that can toggle between multiple accounts.

Didn't think about checking the examples. Utilizing the `FBSessionLoginBehaviorForcingWebView` behavior seems like the right approach. — basvk, Nov 21 '12 at 07:50

score 0 · Answer 2 · answered May 06 '15 at 10:47

0

Try with this code. I think it will help you.

FBSDKLoginManager *login = [[FBSDKLoginManager alloc] init];
[login logOut];

answered May 06 '15 at 10:47

Atanu Mondal

1,714
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This will create the new instance of FBSDKLoginManager which is not needed – Jignesh Agola May 06 '15 at 11:07

score 0 · Answer 3 · answered May 06 '15 at 11:10

0

If you are using facebook sdk 4.1.0 just call bellow method

if ([FBSDKAccessToken currentAccessToken]) {
     [FBSDKAccessToken setCurrentAccessToken:nil];
     [FBSDKProfile setCurrentProfile:nil]; 
}

answered May 06 '15 at 11:10

Jignesh Agola

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Facebook iOS SDK Logout

3 Answers3