Cannot retrieve email from facebook using swift 3 and ios 10

Question

Hello i am trying to retrieve my email from facebook as i am playing the facebook ios sdk using swift. IOS platform is 10, swift 3 and Xcode 8. I followed tutorials online but having trouble retrieving email.

below is my code:

if FBSDKAccessToken.current() == nil {
            print("I got token")
            let fbButton = FBSDKLoginButton()
            fbButton.readPermissions = ["public_profile", "email", "user_friends"]
            view.addSubview(fbButton)
            fbButton.center = view.center
            fbButton.delegate = self
            self.fetchprofile()
        }

        else {
            print("Dont have token")
            let loginView : FBSDKLoginButton = FBSDKLoginButton()
            self.view.addSubview(loginView)
            loginView.center = self.view.center
            loginView.readPermissions = ["public_profile", "email", "user_friends"]
            loginView.delegate = self
        }

func loginButton(_ loginButton: FBSDKLoginButton!, didCompleteWith result: FBSDKLoginManagerLoginResult!, error: Error!) {
        if error != nil {
            print(error.localizedDescription)
            return
        }
        print("I'm in")
        fetchprofile()
    }

func fetchprofile() {

        print("Getting profile")

        let parameters = ["fields": "email"]

        let graphRequest:FBSDKGraphRequest = FBSDKGraphRequest(graphPath: "me", parameters: parameters, httpMethod: "GET")

        graphRequest.start(completionHandler: {(connection, result, error) -> Void in

            if error != nil {
                print("Error retrieving details: \(error?.localizedDescription)")
                return
            }

            guard let result = result as? [String:[AnyObject]], let email = result["email"] else {
                return
            }
            print("Email: \(email)\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n")
            self.view.backgroundColor = UIColor.red

        })
    }

and in my appdelegate.swift file :

 //have both google and facebook signin. Google works but facebook doesn't
func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {
        return GIDSignIn.sharedInstance().handle(url,
                                                    sourceApplication: options[UIApplicationOpenURLOptionsKey.sourceApplication] as! String,
                                                    annotation: options[UIApplicationOpenURLOptionsKey.annotation]) ||
        FBSDKApplicationDelegate.sharedInstance().application(app, open: url, sourceApplication: options[UIApplicationOpenURLOptionsKey.sourceApplication] as! String, annotation: options[UIApplicationOpenURLOptionsKey.annotation])
    }

I am able to log in and log out but not able to retrieve email.

UPDATE Actually when i actually pass print(email) i can see it on the console as an optional statement. I'm having trouble displaying it without optional statment

Answer 1

I have solved the problem in this way:

func fetchProfile(){
     FBSDKGraphRequest(graphPath: "/me", parameters: ["fields" : "email, name, id, gender"])
        .start(completionHandler:  { (connection, result, error) in
            guard let result = result as? NSDictionary, let email = result["email"] as? String,
                let user_name = result["name"] as? String,
                let user_gender = result["gender"] as? String,
                let user_id_fb = result["id"]  as? String else {
                    return
            }         
        })

    }