FBSDKAccessToken currentAccessToken在登录后没有被更新 [英] FBSDKAccessToken currentAccessToken is not being updated after log in

问题描述

我实施了一个完美的Facebook登录按钮。然而，在用户成功登录到Facebook并返回到应用程序之后， [FBSDKAccessToken currentAccessToken] 返回 NO 。我添加了一个观察者，看看我想要的代码是否在返回到应用程序后运行：

I implemented a Facebook login button which works perfectly fine. However, after user successfully logs in into Facebook and goes back to the app, [FBSDKAccessToken currentAccessToken] returns NO. I added an observer to see if the code I want is running after returning back to the app:

-(void)viewDidLoad
{
   [[NSNotificationCenter defaultCenter] addObserver:self   selector:@selector(checkLogIn)name :UIApplicationWillEnterForegroundNotification object:nil];
}
-(void)checkLogIn
 {
         NSLog(@"IN CHECK LOG IN");

        if ([FBSDKAccessToken currentAccessToken]) {

            NSLog(@"Access Token Activated");

        }
 }

之后退回登录后该应用程序正在调用 checkLogIn 方法，但 [FBSDKAccessToken currentAccessToken] 仍返回 NO 。
但是，当我按下iPhone上的主页按钮后，它会更改为YES，然后返回到应用程序。

And after Log In when I return to the app the checkLogIn method is being called but [FBSDKAccessToken currentAccessToken] still returns NO. However, it changes to YES after I press home button on iPhone and go back to the app.

如何立即更新，所以我可以向用户显示另一个视图控制器？

How can it be updated immediately, so I can show user another view controller?

更新：
我找到了在回到应用程序后执行正确的代码的方式。关键是使用 FBSDKAccessTokenDidChangeNotification 是通知中心。所以最终的结果将是这样的：

UPDATE: I found out the way to execute proper code after getting back to the app. The key is to use FBSDKAccessTokenDidChangeNotification is Notification Center. So final result will be like this:

 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkLogIn) name: FBSDKAccessTokenDidChangeNotification object:nil];

该方式令牌将被更新，它将工作。

That way token will be updated and it will work.

推荐答案

请检查您的appDelegate类并实现FB SDK所需的所有方法。我附加的屏幕截图相同。

Please check your appDelegate class and implement all the required methods of FB SDK. I am attaching a screenshot for the same.

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