即使當我通過Facebook應用程序註銷時，iPhone facebook sdk也會顯示有效會話

Question

經過許多小時的代碼嘗試，在線搜索後，我必須尋求幫助。我在UITableViewCell中有一個共享按鈕。在其觸摸動作上，我打開Facebook登錄對話框，然後如果登錄，我會顯示提要對話框。它工作正常，但即使我通過Facebook應用程序註銷sessionIsValid顯示YES。這裏的代碼...

if(indexPath.row==0) 
     { 
      AppId=@"xxx"; 

      AppDelegate *appDelegate=(AppDelegate*)[[UIApplication sharedApplication]delegate]; 
      appDelegate.scheduleViewController=self; 
      self.facebook = [[Facebook alloc] initWithAppId:AppId andDelegate:self]; 
      // [self.facebook requestWithGraphPath:@"me" andDelegate:self]; 
      if ([defaults objectForKey:@"FBAccessTokenKey"] 
       && [defaults objectForKey:@"FBExpirationDateKey"]) { 
       self.facebook.accessToken = [defaults objectForKey:@"FBAccessTokenKey"]; 
       self.facebook.expirationDate = [defaults objectForKey:@"FBExpirationDateKey"]; 

      } 
      if (![self.facebook isSessionValid]) { 
       [self.facebook authorize:permissions]; 
      } 
      else 
       [self doStuffAfterLogin:[self.facebook accessToken]]; 

     } 

- (void)fbDidLogin {  
    [defaults setObject:[self.facebook accessToken] forKey:@"FBAccessTokenKey"]; 
    [defaults setObject:[self.facebook expirationDate] forKey:@"FBExpirationDateKey"]; 
    [defaults synchronize]; 
    [self doStuffAfterLogin:[self.facebook accessToken]]; 
} 
- (void)request:(FBRequest *)request didFailWithError:(NSError *)error { 

    NSLog(@"%@", [error localizedDescription]); 
    NSLog(@"Err details: %@", [error description]); 
    UIAlertView *alertView=[[UIAlertView alloc]initWithTitle:@"Error!" message:@"Error!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; 
    [alertView show]; 
    [defaults removeObjectForKey:@"FBAccessTokenKey"]; 
    [defaults removeObjectForKey:@"FBExpirationDateKey"]; 
    [self.facebook authorize:permissions]; 

} 

-(void)doStuffAfterLogin:(NSString*)accessToken; 
{ 
    NSMutableString *imgUrl=[[NSMutableString alloc]init]; 
    if([[defaults objectForKey:@"imageUrl"] isEqualToString:@""]) 
     imgUrl= @"http://artist.eventseekr.com/images/no-photo.png"; 
    else 
     imgUrl=[defaults objectForKey:@"imageUrl"]; 
    NSMutableDictionary* params = [NSMutableDictionary dictionaryWithObjectsAndKeys: 
            AppId, @"app_id", 
            imgUrl, @"picture", 
            [NSString stringWithFormat:@"Watch %@ in action at the %@ event",[defaults objectForKey:@"name"],[defaults objectForKey:@"eventName"]], @"caption", 
            @"Sample Festival App", @"description", 
            nil]; 

    [self.facebook dialog:@"feed" andParams:params andDelegate:self]; 

} 

Answer 1

這是正確的。每個應用都有自己的沙箱區域。所以你已經授權你的應用程序，你的應用程序已經存儲了一個它可以用來驗證自己的令牌。它對任何其他應用程序一無所知。所以如果你註銷facebook應用程序，它不知道。