fbconnect logout is not working perfectly - iphone

Question

i have integrated Fbconnect in LoginViewController.I want to logout the session from another view controller .. How i can do this ?
I tried this ..
LoginViewController *obj1 = [[LoginViewController alloc] init];
[obj1._session logout];
[obj1._session.delegates removeObject: self];
It removing the session..But wen i go to LoginViewController the button is showing logout.But when i quit application and run it, the image is updated.
In LoginViewController i have
#interface LoginViewController : UIViewController <FBDialogDelegate, FBSessionDelegate, FBRequestDelegate>{
IBOutlet UITextField *txtUsername;
IBOutlet UITextField *txtPassword;
IBOutlet UILabel *lblMessage;
IBOutlet FBLoginButton* _loginButton;
FBSession* _session;
}
#property (nonatomic, retain) FBSession *_session;
and am synthesizing it #synthesize _session;
....What else i have to do ?
Somebody please help me..am very new to Iphone application and objective c

Answer 1

I got the answer ..My Friend helped me.. i want to share it...
simply
import "FBConnect.h"
in ur second view controller
then .......
FBSession *session = [FBSession
session]; [session logout];
It works fine

Answer 2

-(void)clickfb:(id)sender
{
NSHTTPCookieStorage* cookies = [NSHTTPCookieStorage sharedHTTPCookieStorage];
for (NSHTTPCookie* cookie in
[[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies]) {
[cookies deleteCookie:cookie];
}
[self showLoggedOut:YES];
}
(void) showLoggedOut:(BOOL)clearInfo {
//[self.navigationController setNavigationBarHidden:YES animated:NO];
// // Remove saved authorization information if it exists and it is
// // ok to clear it (logout, session invalid, app unauthorized)
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if (clearInfo && [defaults objectForKey:#"FBAccessTokenKey"]) {
[defaults removeObjectForKey:#"FBAccessTokenKey"];
[defaults removeObjectForKey:#"FBExpirationDateKey"];
[defaults synchronize];
//
// // Nil out the session variables to prevent
// // the app from thinking there is a valid session
AppDelegate *delegate = (AppDelegate *) [[UIApplication sharedApplication] delegate];
if (nil != [[delegate facebook] accessToken]) {
[delegate facebook].accessToken = nil;
}
if (nil != [[delegate facebook] expirationDate]) {
[delegate facebook].expirationDate = nil;
}
}
}