从一个视图控制器获取 Facebook 值（电子邮件、姓名等）并将它们传输到另一个视图控制器

Question

所以我目前正在设计一个应用程序并正在处理帐户注册。我已经在其中实现了 Facebook 登录，但我无法获取用户的 Facebook 信息并将其传输到下一页，理想情况下，姓名和电子邮件字段将填充从 Facebook 收到的那些值。

Facebook 登录的初始页面如下所示：

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.
}

下一个视图控制器，一个典型的注册页面，有这些文本字段：

@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 获取值并将它们放入这些文本输入框中。我对编程很陌生，所以非常感谢任何帮助，谢谢！

Answer 1

首先，将 FB 值存储在您以后可以访问的 var(s) 中。

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 prepareForSegue 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 
}