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在Unity 中要通过代码将一张贴图切割成多张小图，可以使用以下方法：

    /// <summary>/// 把一张图片切割成多张使用/// </summary>/// <param name="texture">原图</param>/// <param name="rows">切割的行数</param>/// <param name="columns">切割的列数</param>/// <returns></returns>public List<Texture2D> CutPic(Texture2D texture,int rows,int columns){List<Texture2D> texs = new List<Texture2D>();int width = texture.width / columns;int height = texture.height / rows;for (int row = 0; row < rows; row++){for (int col = 0; col < columns; col++){int x = col * width;int y = row * height;Rect rect = new Rect(x, y, width, height);Texture2D tex = new Texture2D(width, height, TextureFormat.RGBA32, false);//Sprite sprite = Sprite.Create(texture, rect, new Vector2(0.5f, 0.5f));Color[] pixels = texture.GetPixels(x, y, width, height);tex.SetPixels(pixels);tex.Apply();texs.Add(tex);}}return texs;}

 注意：要想成功实现切割，要保证图片是可读的。

使用上面方法我把场景中RawImage里面的贴图切成4块，

List<Texture2D> textures = CutPic((Texture2D)bigImg.texture, 2, 2);

然后再把切出的图分别给到4个新的RawImage，效果如下图。

完成得不错！