通过学习YouTube的教程，学了一个简单的网格系统，所以在这做了个总结。
效果如图

点击网格可以修改里面的数字

其实在游戏开发中，可以使用这个去划分地图区域，例如植物大战僵尸，就可以用这个去划分地方区域，通过点击地图网格，生成植物，不过在这我们修改数字。
代码如下

using UnityEngine;

public class Grid
{
    public int width; //长度
    public int helight; //高度
    public int cellSize; //格子尺寸
    public Vector3 startPos;  //起点坐标
    public int[,] arrayCell;  //网格数组，存储网格内容
    public TextMesh[,] arrayTextMesh;      //存储网格textmesh，具体是用来表现

    public Grid(int width, int helight, int cellSize, Vector3 startPos)
    {
        this.width = width;
        this.helight = helight;
        this.cellSize = cellSize;
        this.startPos = startPos;
        arrayCell = new int[width, helight];
        arrayTextMesh = new TextMesh[width, helight];

        for (int i = 0; i < arrayCell.GetLength(0); i++)
        {
            for (int j = 0; j < arrayCell.GetLength(1); j++)
            {
                arrayTextMesh[i ,j] = SetText(arrayCell[i, j].ToString(), GetWorldPos(i, j) + new Vector3(cellSize, cellSize)*0.5f, Color.white);
                Debug.DrawLine(GetWorldPos(i, j), GetWorldPos(i, j + 1), Color.black, 100f);
                Debug.DrawLine(GetWorldPos(i, j), GetWorldPos(i+1, j), Color.black, 100f);
            }
        }
        Debug.DrawLine(GetWorldPos(0, helight), GetWorldPos(width, helight), Color.black, 100f);
        Debug.DrawLine(GetWorldPos(width, 0), GetWorldPos(width, helight), Color.black, 100f);

    }
    //偏移坐标
    public Vector3 GetWorldPos(int x, int y)
    {
        return new Vector3(x, y) * cellSize + startPos;
    }
    //设置网格中的值
    public void SetValue(int x, int y, int value)
    {
        if (x >= 0 & y >= 0 & x < width & y < helight)
        {
            arrayCell[x, y] = value;
            arrayTextMesh[x, y].text = value.ToString();

        }
    }
    //将点击的坐标传入
    public void SetValue(Vector3 pos, int value)
    {
        int x, y;
        GetXY(pos, out x, out y);
        SetValue(x, y, value);
    }

    //将点击的坐标转化为网格中位置
    public void GetXY(Vector3 pos, out int x, out int y)
    {
        x = Mathf.FloorToInt(pos.x / cellSize);
        y = Mathf.FloorToInt(pos.y / cellSize);
    }

    //点击的表现，这里是修改网格内容
    public TextMesh SetText(string text, Vector3 pos, Color color)
    {
        GameObject objText = new GameObject("WorldText", typeof(TextMesh));
        TextMesh textMesh = objText.GetComponent<TextMesh>();
        textMesh.text = text;
        textMesh.color = color;
        textMesh.alignment = TextAlignment.Center;
        textMesh.anchor = TextAnchor.MiddleLeft;
        textMesh.characterSize = 0.28f;
        objText.transform.position = pos;
        return textMesh;
    }
}

调用的脚本：

using UnityEngine;

public class GridTest : MonoBehaviour
{
    public Grid grid;
    void Start()
    {
        grid = new Grid(10, 6, 2, Vector3.zero);
    }

    // Update is called once per frame
    void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            grid.SetValue(GetPos(), 1);
        }
    }

    public Vector3 GetPos()
    {
        Vector3 pos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
        pos.z = 0;
        return pos;
    }
}

随便一提
运行中，这个要点击，否则是看不到网格的