如何使用另一个 ViewController 中的 var？

Question

我有空的 var，然后我需要从 textField 向它传递值

class ViewController: UIViewController, UITextFieldDelegate {
   
    @IBOutlet weak var textFieldToken: UITextField!
    public var authToken = ""
    
    override func viewDidLoad() {
        super.viewDidLoad()
    }

    
    @IBAction func signInButton(_ sender: Any) {
        authToken = self.textFieldToken.text!
        print(authToken)
    }

然后我需要在另一个控制器中使用“authToken”，但它总是为零，我该如何使用它？

class ReposViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
    var tokens = ViewController()
    
    override func viewDidLoad() {
        super.viewDidLoad()

        print(tokens.authToken)

    }

谢谢你！

Answer 1

试试这个：

class ViewController: UIViewController, UITextFieldDelegate {
   
    @IBOutlet weak var textFieldToken: UITextField!
    
    override func viewDidLoad() {
        super.viewDidLoad()
    }
    
    @IBAction func signInButton(_ sender: Any) {
        Controller.sharedInstance.token = self.textFieldToken.text ?? ""
        print(Controller.sharedInstance.token)
    }
}

class ReposViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        print(Controller.sharedInstance.token)
    }
}

//Singelton class
class Controller {

    private static var privateSharedInstance: Controller?
    static var sharedInstance: Controller {
        if privateSharedInstance == nil {
            privateSharedInstance = Controller()
        }
        return privateSharedInstance!
    }
    private init() { }

    var token: String = ""
}