ios - 无法在 swift 3/FBSDK 4.17 中正确检索 FBSDKAccessToken 当前 token

Question

我使用函数 FBSDKAccessToken.currentAccessToken() 来检索 FB token ，它工作正常，直到我在 swift 3 和 4.17 SDK 中迁移了我的应用程序。现在，该函数已重命名为 FBSDKAccessToken.current() 并且在应用程序委托(delegate)重新加载时为 nil。我已经执行了一些测试，并且在我重新启动我的应用程序并且我之前已经登录过 FB 之后我设法获得了 token ，但这不是我所期望的行为。

编辑:我恢复到 4.15 并且它正在重新处理。

这是我的 AppDelegate 中的代码:

func applicationDidBecomeActive(_ application: UIApplication)
{

    FBSDKAppEvents.activateApp();

}

func application(_ application: UIApplication, open url: URL, sourceApplication: String?, annotation: Any)  -> (Bool)
{

    let wasHandled: Bool = FBSDKApplicationDelegate.sharedInstance().application(application
        ,open:url
        ,sourceApplication:sourceApplication
        ,annotation:annotation)

    if (wasHandled) {
        if let fbtoken = FBSDKAccessToken.current() {
          loginWithFacebook(fbtoken.tokenString);
        }else{
            print("no current token")
        }
    }

    return wasHandled
}

func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {


    let wasHandled: Bool =  FBSDKApplicationDelegate.sharedInstance().application(
        app,
        open: url as URL!,
        sourceApplication: options[UIApplicationOpenURLOptionsKey.sourceApplication] as! String,
        annotation: options[UIApplicationOpenURLOptionsKey.annotation]
    )

    if (wasHandled) {
        if let fbtoken = FBSDKAccessToken.current() {
            loginWithFacebook(fbtoken.tokenString);
        }else{
            print("no current token")
        }
    }

    return wasHandled;
}

感谢您的帮助:)丹尼斯

Answer 1

出于某种原因，这不再有效。

如果您使用FBSDKLoginButton，您必须使用FBSDKLoginButtonDelegate 来等待回调。

class LoginView: UIViewController, FBSDKLoginButtonDelegate {
    @IBOutlet weak var facebookButton: FBSDKLoginButton!

    override func viewDidLoad() {
        facebookButton.delegate = self
    }

   //Called at the end of the user connection 
   func loginButton(_ loginButton: FBSDKLoginButton!, didCompleteWith result: FBSDKLoginManagerLoginResult!, error: Error!) {
       if ((error) != nil) {
           //Process error
       } else if result.isCancelled {
           // Handle cancellations
           print("result is canceled")
        } else {
            if let fbToken = result.token.tokenString {
                print(fbToken)
            }
        }
    }

    func loginButtonDidLogOut(_ loginButton: FBSDKLoginButton!) {
        print("logout from FB")
    }
}

或者，您也可以使用 FBSDKLoginManager。在此处查看文档:

https://developers.facebook.com/docs/reference/ios/current/class/FBSDKLoginManager/

希望对您有所帮助!