从一个视图控制器中获取Facebook值(电子邮件，名称等)，然后将其传输到另一个视图控制器

Question

因此，我目前正在设计一个应用程序并正在处理帐户注册。我已经实现了Facebook登录，但是我很难获取用户的Facebook信息并将其传输到下一页，理想情况下，姓名和电子邮件的字段将被从Facebook收到的那些值填充。

带有Facebook登录的初始页面看起来像：

class RegisterVC: UIViewController, FBSDKLoginButtonDelegate {
override func viewDidLoad() {
    super.viewDidLoad()
    let loginButton = FBSDKLoginButton()
    view.addSubview(loginButton)
    loginButton.frame = CGRect(x: 82, y: 325, width: view.frame.width - 210, height: 59)
    loginButton.delegate = self
}
func loginButtonDidLogOut(_ loginButton: FBSDKLoginButton!) {
    print("Did log out of facebook")
}
func loginButton(_ loginButton: FBSDKLoginButton!, didCompleteWith result: FBSDKLoginManagerLoginResult!, error: Error!) {
    if error != nil {
        print(error)
        return
    }
    print("Successfully logged in")
    FBSDKGraphRequest(graphPath: "/me", parameters: ["fields": "id, name, email"]).start {(connection, result, err) in
        if err != nil {
            print("Failed to start graph request", err)
            return
        } else {
            guard let data = result as? [String:Any] else {return}
            let fbEmail = data["email"]
            let fbName  = data["name"]
        }
        print(result)
    }
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    //get destination view an set the fullname
        let vc = segue.destination as? CreateAccountVC
        vc?.email = self.fbEmail
        vc.fullname = self.fbName
}
override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

和下一个视图控制器是一个典型的注册页面，具有以下文本字段：

@IBOutlet weak var fullname: UITextField!
@IBOutlet weak var username: UITextField!
@IBOutlet weak var age: UITextField!
@IBOutlet weak var email: UITextField!
@IBOutlet weak var verifyEmail: UITextField!
@IBOutlet weak var password: UITextField!
@IBOutlet weak var verifyPassword: UITextField!

我不知道如何从Facebook中获取价值并将其放入这些文本输入框中。我对编程非常陌生，因此，任何帮助都将不胜感激，谢谢！

Answer 1

首先，将fb值存储在var（s）中，您可以稍后访问。

接下来，您可以在过渡之前设置下一个视图的值。例如，如果您使用的是segue，则可以在Preparforsegue中这样做：

class RegisterVC: UIViewController, FBSDKLoginButtonDelegate {
var fbName:String?
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
  //get destination view an set the fullname
  let vc=segue.destination as? MyCustomVC
  vc.fullName=self.fbName 
}