public static void CalcualteGraphicRect(Graphic graphic, ref Rect rect){Vector2 size = Vector2.zero;Text textComponent = graphic as Text;if (textComponent != null){List<UIVertex> textUIVertexList = new List<UIVertex>();textUIVertexList = textComponent.cachedTextGenerator.verts as List<UIVertex>;//textComponent.cachedTextGenerator.GetVertices(textUIVertexList); float minX = float.MaxValue;float maxX = float.MinValue;float minY = float.MaxValue;float maxY = float.MinValue;//使用center计算出中心点后，你还需要转空间，这个转空间一直出问题，所以不采用这种办法//Vector3 center = Vector3.zero;Vector3 minPos = Vector3.zero;Vector3 maxPos = Vector3.zero;string str = "";for (int i = 0; i < textUIVertexList.Count; i++){Vector3 pos = textUIVertexList[i].position;minX = Mathf.Min(minX, pos.x);maxX = Mathf.Max(maxX, pos.x);minY = Mathf.Min(minY, pos.y);maxY = Mathf.Max(maxY, pos.y);minPos = Vector3.Min(minPos, pos);maxPos = Vector3.Max(maxPos, pos);//center += pos;str += pos + " ";}size.x = maxX - minX;size.y = maxY - minY;//center /= textUIVertexList.Count; //转空间会有问题 不采用计算中心点 而是直接算出以文本空间（中心点是文本坐标点rect.position)的网格中心点。//转空间就是直接用 网格中心点 + 文本坐标点，将网格中心点转到 文本所在空间（Canvas空间系下) 将其作为Rect区域的中心点去计算网格相交Vector2 rawPos = rect.position;//解决偏移问题,根据MinX MaxX MinY MaxY 求出局部中心点, 用文本中心点rect.position加上局部中心点就能得到真正的文本网格中心点Vector2 offset = new Vector2(((minX + maxX) / 2.0f), ((minY + maxY) / 2.0f));rect.position += offset;Debug.Log("rawPos:" + rawPos + " afterPos:" + rect.position + "offset:" + offset);Debug.Log(graphic.gameObject.name + " " + size + "\n" + str);}else{Image imageComponent = graphic as Image;RectTransform r = imageComponent.GetComponent<RectTransform>();//只能编辑器读资源来获取MeshType，其他方式都试过不行...string path = AssetDatabase.GetAssetPath(imageComponent.sprite);TextureImporter textureImporter = AssetImporter.GetAtPath(path) as TextureImporter;TextureImporterSettings settings = new TextureImporterSettings();textureImporter.ReadTextureSettings(settings);//if (imageComponent.overrideSprite.packingMode == SpritePackingMode.Tight) //不能用这个packingMode判断, 会严格按照Sprite的MeshType和图集的Tight Packing决定。if (settings.spriteMeshType == SpriteMeshType.Tight){ Vector3[] worldPosArr = new Vector3[4];r.GetWorldCorners(worldPosArr);float minX = float.MaxValue;float maxX = float.MinValue;float minY = float.MaxValue;float maxY = float.MinValue;string str = "";for (int i = 0; i < worldPosArr.Length; i++){Vector3 pos = worldPosArr[i];minX = Mathf.Min(minX, pos.x);maxX = Mathf.Max(maxX, pos.x);minY = Mathf.Min(minY, pos.y);maxY = Mathf.Max(maxY, pos.y);str += pos + " ";}size.x = (maxX - minX) * 100;size.y = (maxY - minY) * 100;Debug.Log("[Tight] " + graphic.gameObject.name + " " + size + "\n" + str);}else{size = r.rect.size;Debug.Log("[FullRect]" + graphic.gameObject.name + " " + size);}}rect.size = size;}传入组件的Graphic组件（Image和Text都继承于Graphic）可改写脚本直接传你对应的组件也可以，第二个参数是一个Rect类型数据，由外部创建传入。
Rect(rectTransform.localPosition.x, rectTransform.localPosition.y, rectTransform.rect.width, rectTransform.height)构成。
注意这个API最后得到的Rect，并不是rectTransform.rect，它的(x,y)是网格中心点（Canvas空间），它的(z,w)是网格宽度和高度。区别于rectTransform.rect，它的(x,y)是左下角局部坐标点，(z,w)是RectTransform宽度和高度。