Swift：如何在导航控制器之后访问第二视图？

我对swift真的很陌生，目前正在为一个琐事应用程序做一个项目。现在我有了它，在按下开始按钮后，它会将当前视图控制器推到一边，并向用户显示一个新的视图（vc），但我不确定如何/在何处向用户在按下开始按钮后看到的新视图（vc）添加文本字段和按钮

       
       let vc = UIViewController()
       vc.view.backgroundColor = .red
       
       navigationController?.pushViewController(vc, animated: true) 

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您必须创建另一个包含UI的视图控制器

   class SecondViewController: UIViewController {
       private let textView = UITextView()
       
       func viewDidLoad() {
           super.viewDidLoad()
           
           // Add text view with auto layout
           view.addSubview(textView)
           textView.translatesAutoresizingMaskIntoConstraints = false
           textView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
           textView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
           textView.heightAnchor.constraint(equalToConstant: 44).isActive = true
       }
   }

然后，当尝试推送新的视图控制器时，请使用此

SecondViewController

   let vc = SecondViewController()
   vc.view.backgroundColor = .red
   
   navigationController?.pushViewController(vc, animated: true) 

---

可以使用指定的标识符声明视图控制器

let vc = UIStoryboard.init(name: "Authentication", bundle: Bundle.main).instantiateViewController(withIdentifier: "Login") as? LoginVC
self.navigationController?.pushViewController(vc!, animated: true)