how to logout from facebook using graph API

Question

I followed graph API and all has gone well till now. The problem occurs when I try to logout from facebook. The logout never occurs: I have used this method:

    [facebook logout];

I have implemented the delegate method:

    - (void) fbDidLogout {

NSLog(@"did logout");

// Remove saved authorization information if it exists
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if ([defaults objectForKey:@"FBAccessTokenKey"]) {
    [defaults removeObjectForKey:@"FBAccessTokenKey"];
    [defaults removeObjectForKey:@"FBExpirationDateKey"];
    [defaults synchronize];
}

}

Problem is that user is logined again when he run the application again. I want that each time I enter facebook screen, new user should login. However this method doesnt work. Please help

score 4 · Accepted Answer · answered Jun 08 '12 at 10:24

4

- (void)logOutFB {

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];
    }
}
}

answered Jun 08 '12 at 10:24

Warif Akhand Rishi

23,920
8
80
107

one more thing, what this code does and what was the problem with facebook logout method. – user1374408 Jun 08 '12 at 13:02
:-) frankly... I don't know for sure. But looks like searching all the cookies for domainName @"facebook" and deleting that cookie. I faced the same problem, found answer somewhere googling... – Warif Akhand Rishi Jun 08 '12 at 13:48
yeah, code does that only.A good fix for facebook logout method :D – user1374408 Jun 09 '12 at 10:11

score 1 · Answer 2 · answered Jun 08 '12 at 09:18

1

Implement the following code

Facebook *fb; //your fbconnect object

if([fb isSessionValid])
{
    fb.accessToken = nil;
    fb.expirationDate = nil;
}

answered Jun 08 '12 at 09:18

Omar Abdelhafith

21,163
5
52
56

score 0 · Answer 3 · answered Jun 08 '12 at 09:27

Try it :

-(void)fbLogout  {  
    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];
        }       }   [NSUserDefaults resetStandardUserDefaults];
    [[NSUserDefaults standardUserDefaults]removeObjectForKey:@"fb_accesstoken"];    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];
        }
    }  }

how to logout from facebook using graph API

3 Answers3