从另一个类中调用时，GameObject数组返回null

Question

我目前处于丢失状态，因为我的GameObject返回null。

关于这个问题，我不确定是否因为我错过了一件小事，或者如果我直接编写完全错误的多个类的使用。

我的代码，我产生了游戏对象数组：

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++;  
      } 
     } 
    } 

而且我的课，我想用一组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]; 
       } 

     } 
    } 
} 

我试着用一些值瞎搞，以及如何该课程已初始化，但没有占上风。

我的完整的错误：在gameCalibration

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

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

Answer 1

public gridInit gInit = new gridInit(); 

代替

public gridInit gInit; 

我没有看到你创建对象的实例随时随地

Answer 2

问题是类，gridInit尚未实例，当你有这种情况

public gridInit gInit; 
public gridInit gInit2 = new gridInit(); 

gInit.goTile[i].GetComponent<Renderer>().enabled = false; 
gInit2.goTile[i].GetComponent<Renderer>().enabled = false; 

现在你怎么想发生在这里借这个情况，例如

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 

这样？ gInit为空，因为它没有实例化，而gInit2的作品，因为当我们使用= new gridInit();它创建了类的新实例，然后创建它的变量