viewController在segue传递之前呈现

Question

我有一组按钮，我想使用segue将他们的标题发送到下一页。这就是我所做的：

// in my first page i have : 
 @IBAction func btn_language_action(_ sender: UIButton) {
        let chosen_language = sender.currentTitle!
        print(chosen_language)
        let game_level = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "game_level") as! game_level_viewController
        self.present(game_level, animated: false, completion: nil)
        performSegue(withIdentifier: "GL", sender: chosen_language)

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        let game_level_viewController = segue.destination as! game_level_viewController
        game_level_viewController.language = sender as? String

    }

在第二个视图中我有：

  @IBOutlet weak var lang: UILabel!
    var language : String?
    override func viewDidLoad() {
        super.viewDidLoad()
       setUI()
    }

    func setUI (){

        lang.text = language
        print(language )

    }

但是我可以成功传递信息，但是在我收到发送的内容之前已经加载了视图。知道我该如何解决这个问题？ 在控制台中我有：

language ==>  nil
language ==>  Optional("Persian")

Answer 1

问题是由于这一行

self.present(game_level, animated: false, completion: nil)

即使您已将segue指定给控制器

，您也可以展示此控制器

删除这两行，一切都会正常

 let game_level = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "game_level") as! game_level_viewController
        self.present(game_level, animated: false, completion: nil)

Answer 2

你已经写了两行，它们都用于视图控制器之间的转换，所以当你使用segue时，不要同时呈现viewcontroller。 您的代码中存在问题，请尝试删除以下代码。

self.present(game_level, animated: false, completion: nil)