UIAlertController taking multiple user inputs

    @IBAction func alertCalled(_ sender: Any) {
        let alert = UIAlertController(title: "Login", message: "Enter username and password", preferredStyle: .alert)

        alert.addTextField() { textField in
            textField.placeholder = "username"
        }

        alert.addTextField() { textField in
            textField.placeholder = "password"
            textField.isSecureTextEntry = true
        }

        let cancelAction = UIAlertAction(title: "Cancel", style: .cancel)
        let yesAction = UIAlertAction(title: "OK", style: .destructive) { _ in
            let usernameTF = alert.textFields![0] as UITextField
            let passwordTF = alert.textFields![1] as UITextField
            guard let username = usernameTF.text, let password = passwordTF.text  else {
                return
            }
            print("Username: \(username) || Password: \(password)")
        }

        alert.addAction(cancelAction)
        alert.addAction(yesAction)

        self.present(alert, animated: true)
    }