Question

我在使用FBSDKAccessToken时遇到了一些奇怪的行为：

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    println(FBSDKAccessToken.currentAccessToken()) //prints nil

    if (FBSDKAccessToken.currentAccessToken() != nil)
    {
        // User is already logged in, do work such as go to next view controller.
        println("this never prints")
        self.generateAPILoginDetails()
    }
    else
    {
        let loginView : FBSDKLoginButton = FBSDKLoginButton()
        self.view.addSubview(loginView)
        loginView.center = self.view.center
        loginView.readPermissions = ["public_profile", "email", "user_friends"]
        loginView.delegate = self
        FBSDKProfile.enableUpdatesOnAccessTokenChange(true)
        NSNotificationCenter.defaultCenter().addObserver(self, selector: "onProfileUpdated:", name:FBSDKProfileDidChangeNotification, object: nil)
    }


}

我正在尝试获取令牌，但它始终为nil，即使loginView按钮显示＆＃34; Log Out＆＃34;消息，表明用户确实登录了Facebook。

Answer 1

我明白了：

您需要添加：

 NSNotificationCenter.defaultCenter().addObserver(self, selector: "onTokenUpdated:", name:FBSDKAccessTokenDidChangeNotification, object: nil)

我的NSNotification名称错误（FBSDKProfileDidChangeNotification）。

然后你使用你的回调处理程序获取令牌并用它做任务！

有关详细信息，请参阅此处：http://www.andrewkouri.com/swift-1-2-and-facebooks-new-login-sdk/

即使登录，Facebook iOS SDK FBSDKAccessToken.currentAccessToken（）也为零？

1 个答案: