小编men*_*ska的帖子

所以我有 FBViewController 类，它应该显示一个按钮让我登录和注销（只是为了测试 FB 登录）。我将它集成到新创建的项目中并且一切正常。然后我将它重新设计到我的应用程序中，但它不起作用。不确定它是否与 swift 版本或其他...使用 Xcode 10.0

import UIKit
import FBSDKLoginKit

class FBViewController: UIViewController, FBSDKLoginButtonDelegate {


    override func viewDidLoad() {
        super.viewDidLoad()
        let btnFBLogin = FBSDKLoginButton()
        btnFBLogin.readPermissions = ["public_profile", "email"]
        btnFBLogin.delegate = self
        btnFBLogin.center = self.view.center
        self.view.addSubview(btnFBLogin)

        if FBSDKAccessToken.current() != nil{
            print("Logged IN ALREADY")
            printInfo()
        }else{
            print("not logged in")
        }

    }

    func loginButton(_ loginButton: FBSDKLoginButton!, didCompleteWith result: FBSDKLoginManagerLoginResult!, error: Error!) {
        if error != nil{
            print(" error")
      //      print(error.localizedDescription)
        }else if result.isCancelled {
            print("User cancelled.")
        }
        else {
            print("Logge …