Load Facebook object

gistfile1.m

+(BOOL) loadSession {
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    if (![defaults objectForKey:ACCESS_TOKEN_KEY] ||
        ![defaults objectForKey:EXPIRATION_DATE_KEY] ||
        ![defaults objectForKey:FACEBOOK_USER]) {
        [Util clearSession];
        return NO;
    }
    
    Facebook *facebook = [[Util sharedInstance] facebook];
    facebook.accessToken = [defaults objectForKey:ACCESS_TOKEN_KEY];
    facebook.expirationDate = [defaults objectForKey:EXPIRATION_DATE_KEY];
    
    if (![facebook isSessionValid]) {
        [Util clearSession];
        return NO;
    }
    [[Util sharedInstance] setUser:[defaults objectForKey:FACEBOOK_USER]];
    NSLog(@"%@", [[[Util sharedInstance] user] objectForKey:@"username"]);
    
    return YES;
}