ios - swift 5 TextBox 值在标签中显示

Question

我只是在创建一个欢迎屏幕，希望用户输入名字，然后点击按钮保存他的名字并将其打印在标签中

class userDataViewController: UIViewController {

    // first name user input
    @IBOutlet weak var firstUserInput: UITextField!
    
    // last name user input
    @IBOutlet weak var lastNameInput: UITextField!
    
    @IBAction func saveButton(_ sender: Any) {
        var _: NSString? = firstUserInput?.text as NSString?
        var _: NSString? = lastNameInput?.text as NSString?
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()

标签： iosswiftswift5