Question

我目前迷路了，因为我的GameObject返回null。

关于这个问题，我不确定是不是因为我错过了一件小事，或者我直接编程完全错误地使用了多个类。

我生成gameobject数组的代码：

public class gridInit : MonoBehaviour {

    const int mapWidth = 33;
    const int mapHeight = -27;
    const float tileSizeUnits = 1.0f / 3;
    public GameObject tile;
    // Use this for initialization
    void Start () {
        GenerateTileMap();
        Screen.fullScreen = true;
    }

    void Awake()
    {

    }
    // Update is called once per frame
    void Update () {

    }

    bool walkable = false;
    [HideInInspector]
    public GameObject[] goTile = new GameObject[892]; 

    void GenerateTileMap()
    {
        int tileNumber = 0;
        for (float y = 0; y > mapHeight; y--)
        {
            for (float x = 0; x < mapWidth; x++)
            {
               float tilePosX = x/3;
               float tilePosY = y/3;
               int layerPos = -2;
               goTile[tileNumber] = Instantiate(tile, new Vector3(tilePosX, tilePosY, layerPos), Quaternion.identity) as GameObject;
               goTile[tileNumber].name = "tile" + tileNumber;
               goTile[tileNumber].tag = "grid";
               RaycastHit2D hit;
               Vector3 fwd = goTile[tileNumber].transform.TransformDirection(Vector3.forward);
               Debug.DrawRay(goTile[tileNumber].transform.position, fwd * 50, Color.green);
               hit = Physics2D.Raycast(goTile[tileNumber].transform.position, fwd, 200);
               if (hit)
               {
                   goTile[tileNumber].tag = "walkableGrid";
               }
               tileNumber++;     
            }
        }
    }

我想要使用的课程设置GameObjects：

public class gameCalibration : MonoBehaviour {

    bool calibrationComplete = false;
    public gridInit gInit;
    public cam Cam;

    // Use this for initialization
    void Start () {
    }

    // Update is called once per frame
    void Update () {
        {
            for (int i = 0; i < gInit.goTile.Length; i++)
            {
                if (calibrationComplete == false)
                {
                    gInit.goTile[i].GetComponent<Renderer>().enabled = true;
                }
                else
                {
                    gInit.goTile[i].GetComponent<Renderer>().enabled = false;
                }
            }

            if (calibrationComplete == false)
            {
                Calibrate();
            }
            else
            {
                gInit.GenerateObjects();
                calibrationComplete = true;
            }
        }        
    }


    Vector2[] camTileCenter;
    Vector2 tempCenter;
    void Calibrate()
    {
        for (int i = 0; i < gInit.goTile.Length; i++)
        {
                gInit.goTile[i].GetComponent<SpriteRenderer>().color = Color.red;

                if (Cam.redBlobs[i] != null && camTileCenter[i] != tempCenter)
                {
                    camTileCenter[i] = new Vector2(Cam.redBlobs[i].Width / 2, Cam.redBlobs[i].Height / 2);
                    tempCenter = camTileCenter[i];
                }

        }
    }
}

我已经尝试过搞乱一些值以及如何初始化类，但是没有占上风。

我的完整错误：

NullReferenceException: Object reference not set to an instance of an object
gameCalibration.Update () (at Assets/Scripts/gameCalibration.cs:21)

gameCalibration中的错误行：gInit.goTile[i].GetComponent<Renderer>().enabled = true;

Answer 1

public gridInit gInit = new gridInit();

而不是

public gridInit gInit;

我没有看到你在任何地方创建对象的实例

Answer 2

问题是类case RAM_ADDR is when "000" => RAM_ADDR <= "001"; when "001" => RAM_ADDR <= "010"; when "010" => RAM_ADDR <= "011"; when "011" => RAM_ADDR <= "100"; when "100" => RAM_ADDR <= "101"; when "101" => RAM_ADDR <= "110"; when "110" => RAM_ADDR <= "111"; when "111" => RAM_ADDR <= "000"; when others => RAM_ADDR <= "000"; end case;尚未实例化，例如采取这种情况

gridInit

当你遇到这种情况时

public List<string> exS;
public List<string> exS2 = new List<string>();

Console.WriteLine(exS.Count); //The List<string> is null, as it has not been instantiated - errors
Console.WriteLine(exS2.Count); //the List<string> is blank, as it was instantiated with new List<string>() - prints 0

现在你觉得这里发生了什么？ public gridInit gInit; public gridInit gInit2 = new gridInit(); gInit.goTile[i].GetComponent<Renderer>().enabled = false; gInit2.goTile[i].GetComponent<Renderer>().enabled = false;为null，因为它没有实例化，而gInit有效，因为当我们使用gInit2时，它创建了类的新实例，然后创建了它的变量

从另一个类调用时，GameObject数组返回null

2 个答案: