Calling logout function of facebook ios sdk is not clearing user Credentials

Question

While implementing facebook SSO, calling logout function of facebook ios sdk is not clearing user Credentials and it does not ask to login next time.

Answer 1

I Used Graph Api.....

- (IBAction)loginButtonPressed:(id)sender {

    NSString *client_id = @"dsfgdgfgfgdfgvdfg";

    //alloc and initalize our FbGraph instance
    self.fbGraph = [[FbGraph alloc] initWithFbClientID:client_id];

    //begin the authentication process.....
    [fbGraph authenticateUserWithCallbackObject:self andSelector:@selector(fbGraphCallback:) 
                         andExtendedPermissions:@"user_photos,user_videos,publish_stream,offline_access,user_checkins,friends_checkins"];
}


- (void)logOutButtonPressed {

    NSLog(@"logout");

    fbGraph.accessToken = nil;
    NSHTTPCookie *cookie;
    NSHTTPCookieStorage *storage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    for (cookie in [storage cookies])
    {
        NSString* domainName = [cookie domain];
        NSRange domainRange = [domainName rangeOfString:@"facebook"];
        if(domainRange.length > 0)
        {
            [storage deleteCookie:cookie];
        }
    }

    [self loginButtonPressed:nil];
}

And This code is WORKING FINE..TRY THIS