C# Unity2d:dontDestroyOnLoad是否只工作一次？

我正在做一个项目。我想有两种不同的场景。一个是商店场景，另一个是主要游戏场景。在主游戏场景中有一个显示我的钱的按钮。同样在这个场景中，我通过这个按钮挣钱和赚钱。然后我改变场景。在购物现场，我可以看到我赚的钱，我可以买东西。当然，我的钱减少了。然而，当我再次改变场景时，当我打开主游戏场景时，我的钱变成了0

如何使ShopScene和Maingame场景之间的金额相同

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主游戏的拖放脚本，ShopScene的商店经理。Alsıclose按钮关闭商店并打开主游戏。在代码的末尾，我添加了不起作用的单例代码

看起来您有两张画布。一个在主游戏场景中，一个在商店场景中。如果你的游戏先在主游戏上开始，然后再在你的商店场景中开始。我建议您在唤醒方法中查找对象，而不是使用

GameObject.find（）

创建一个完全独立的对象。这将确保选择正确的画布并将其放入

DontDestroyOnLoad

，因为您似乎在主屏幕上用您不想要的0来保存主屏幕画布。 唤醒方法可能如下所示：

public class DragandDrop : MonoBehaviour
{
   private static DragandDrop instance;
    public GameObject box;
    public GameObject table;
    public Text scoreText;
   public Button moneyBarButton;
    public GameObject canvas;
    public int money;

    private bool isFit;
    private bool isMoving;

    private float startPosX;
    private float startPosY;
    private GameObject [] boxCountArray;
    private GameObject[] moneyCountArray;
    private Vector3 startPosition;

     void Awake()
    {
        canvas = (GameObject.Find("DontDestroyCanvas"));
        DontDestroyOnLoad(canvas);
        if (instance == null)
        {
            instance = this; 
            DontDestroyOnLoad(canvas);
        }
        else if (instance != this)
            Destroy(canvas);

    }

---

那么你的代码就错了。除非您手动销毁，否则加载时不销毁对象将保留。我建议您使用Unity的PlayerPrefs来存储这些类型的值，因为我猜您不希望在刷新游戏后重置金钱。也请分享你的代码。@Harry我添加了我的代码。在主游戏场景中，一切正常。也在运行的时候我打开店景OK。但是，当我再次打开Maingame时，everyting变为0。如果您使用

DontDestroyOnLoad

，您应该同时确保a）没有多个实例同时出现（单例模式）和b）场景中的所有其他内容都可以在场景重新加载后再次获得引用->您可以“滥用”单例模式，并作为

publicstatic

提供参考。当主游戏加载时，如果游戏中还没有画布，则有一个游戏管理器将实例化画布的预置。

public class DragandDrop : MonoBehaviour
{
    public GameObject box;
    public GameObject table;
    public Text scoreText;
   public Button moneyBarButton;
    public Canvas canvas;
    public int money;

    private bool isFit;
    private bool isMoving;

    private float startPosX;
    private float startPosY;
    private GameObject [] boxCountArray;
    private GameObject[] moneyCountArray;
    private Vector3 startPosition;

     void Awake()
    {
       
        DontDestroyOnLoad(canvas);
    }
    // Start is called before the first frame update
    void Start()
    {
       
        startPosition = this.transform.localPosition;
      moneyBarButton= GameObject.Find("MoneyBar").GetComponent<Button>();
        


    }

    // Update is called once per frame
    void Update()
    {
        // moneyBarButton = GameObject.Find("MoneyBar").GetComponent<Button>();
        SceneManager.SetActiveScene(SceneManager.GetSceneByName("Maingame"));
        PlayerPrefs.GetInt("money");
        moneyBarButton.GetComponentInChildren<Text>().text = Convert.ToString(money);
        scoreText.text = "Score: " + money / 10;
        boxCountArray = GameObject.FindGameObjectsWithTag("Box");
        control();
        scoreText.text = "Score: " + (boxCountArray.Length-1);//score artışı
        money = (boxCountArray.Length - 1) * 10;

        
        //moneyBarButton = GameObject.Find("MoneyBar").GetComponent<Button>();

    }
    public bool control() {
        if (!isFit)
        {
            if (isMoving)
            {
                
                Vector3 mousePos = Input.mousePosition;
                mousePos = Camera.main.ScreenToWorldPoint(mousePos);
                
                this.gameObject.transform.localPosition = new Vector3(mousePos.x - startPosX, mousePos.y - startPosY, this.gameObject.transform.localPosition.z);
                return true;
            }
            return false;
        }
        return false;
    }
     void moneyIncrease() {
        
        while (control() == true)
        {
            
            money += 10;
            moneyBarButton.GetComponentInChildren<Text>().text = money.ToString();//para artışı
            PlayerPrefs.SetInt("money", money);
            break;
        }
    
    
    
    }

    private void OnMouseDown()
    {
        if (Input.GetMouseButtonDown(0))
        {
            Vector3 mousePos = Input.mousePosition;
            mousePos = Camera.main.ScreenToWorldPoint(mousePos);

            startPosX = mousePos.x - this.transform.localPosition.x;
            startPosY = mousePos.y - this.transform.localPosition.y;

            isMoving = true;
        }
    }

    private void OnMouseUp()
    {
        isMoving = false;

        if (Mathf.Abs(this.transform.localPosition.x - table.transform.localPosition.x) <= 0.5f &&
            Mathf.Abs(this.transform.localPosition.y - table.transform.localPosition.y) <= 0.5f)
        {
            Vector3 position = new Vector3(UnityEngine.Random.Range(-11,1 ), UnityEngine.Random.Range(-3, 4), transform.position.z);//Yeni oluşacak boxun pozisyonunu random belirler.
            this.transform.position = new Vector3(box.transform.position.x, box.transform.position.y, box.transform.position.z);
            Instantiate(box,position ,Quaternion.identity);//Her kutu masaya yerleştiğinde yeni bir kutu oluşturur
            
            isFit = true;
        }
        else
        {
            this.transform.localPosition = new Vector3(startPosition.x, startPosition.y, startPosition.z);
        }
    }


}

public class closedButton : MonoBehaviour
{
    Scene scene;
  public Button moneyBar;
   
    

    // Start is called before the first frame update
    void Start()
    {

        
    }

    // Update is called once per frame
    void Update()
    {
        
    }
    public void ExitShop()
    {
        SceneManager.GetActiveScene();

        SceneManager.LoadScene(0);




    }
}

public class DragandDrop : MonoBehaviour
{
   private static DragandDrop instance;
    public GameObject box;
    public GameObject table;
    public Text scoreText;
   public Button moneyBarButton;
    public GameObject canvas;
    public int money;

    private bool isFit;
    private bool isMoving;

    private float startPosX;
    private float startPosY;
    private GameObject [] boxCountArray;
    private GameObject[] moneyCountArray;
    private Vector3 startPosition;

     void Awake()
    {
        canvas = (GameObject.Find("DontDestroyCanvas"));
        DontDestroyOnLoad(canvas);
        if (instance == null)
        {
            instance = this; 
            DontDestroyOnLoad(canvas);
        }
        else if (instance != this)
            Destroy(canvas);

    }

public void Awake()
{
    canvas = GameObect.Find('Canvas');//Canvas would be replaced by the gameobjects name
    DontDestroyOnLoad(canvas);
}