-(IBAction)loginfb:(id)sender
{
    NSUserDefaults *userlogin=[NSUserDefaults standardUserDefaults];
    [userlogin removeObjectForKey:@"Safari"];
    if(NSClassFromString(@"SLComposeViewController") != nil)
     {
   ACAccountStore *account = [[ACAccountStore alloc] init];
    ACAccountType *accountType = [account accountTypeWithAccountTypeIdentifier:
                                  ACAccountTypeIdentifierFacebook];
    NSDictionary *options = @{ACFacebookAppIdKey : @"457181451029974",
                           ACFacebookPermissionsKey : @[@"email"],
                          ACFacebookAudienceKey:ACFacebookAudienceEveryone};
    [account requestAccessToAccountsWithType:accountType options:options
                                  completion:^(BOOL granted, NSError *error)
    {
         if (granted == YES)
        {
            NSArray *arrayOfAccounts = [account
                                        accountsWithAccountType:accountType];
            if ([arrayOfAccounts count] > 0)
            {
                if (self.gotUserDetails)
                {
                 return;
                 }
                [self fetchuserinfo];
                NSUserDefaults *userlogin=[NSUserDefaults standardUserDefaults];
                [userlogin setObject:@"useradded" forKey:@"login"];
            }
            else
            {
                [self safariauth];
            }
        }



        }];
           }

    -(void)safariauth
{
    AppDelegate *appDelegate = [[UIApplication sharedApplication]delegate];

    if (appDelegate.session.isOpen)
    {

        [appDelegate.session closeAndClearTokenInformation];
        appDelegate.session = [[FBSession alloc] init];


    [appDelegate.session openWithCompletionHandler:^(FBSession *session,
                                                     FBSessionState status,
                                                     NSError *error) {
        // and here we make sure to update our UX according to the new session state
        [self updateView];
    }];
    }
    else
    {

        if (appDelegate.session.state != FBSessionStateCreated)
        {
            appDelegate.session = [[FBSession alloc] init];
        }

        [appDelegate.session openWithCompletionHandler:^(FBSession *session,
                                                         FBSessionState status,
                                                         NSError *error) {
            // and here we make sure to update our UX according to the new session state
            [self updateView];
        }];
    }

}