向指定UI对象发出射线，并返回射线触碰到了哪些UI对象

    /// <summary>
    /// 向指定UI对象发出射线，并返回射线触碰到了哪些UI对象
    /// </summary>
    /// <param name="canvas">当前canvas</param>
    /// <param name="rectTransform">向这个UI对象坐标发出射线</param>
    /// <returns></returns>
    static List<RaycastResult> GetRaycastResult(Canvas canvas, RectTransform rectTransform)
    {
        List<RaycastResult> raycastResults = new List<RaycastResult>();
        Vector3 screenPos = canvas.worldCamera.WorldToScreenPoint(rectTransform.position);

        PointerEventData eventData = new PointerEventData(EventSystem.current);
        eventData.position = new Vector2(screenPos.x, screenPos.y);
        EventSystem.current.RaycastAll(eventData, raycastResults);

        for (int i = 0; i < raycastResults.Count; i++)
        {
            Debug.Log($"射线碰到了UI对象:{raycastResults[i].gameObject.name}");
        }
        return raycastResults;
    }