Unity 检测是否在UI上的方法

 void LateUpdate()
    {
        Debug.Log("EventSystem.current.IsPointerOverGameObject()=" + 
      EventSystem.current.IsPointerOverGameObject());
        if (!EventSystem.current.IsPointerOverGameObject())
        {

        }
        //if (getCon(Input.mousePosition) <= 0)
       // {
        //    ControlCamera();
       // }
    }

    private  EventSystem es;
    public GraphicRaycaster gra;//需要检测的 UICanvas
    /// <summary>
    /// 返回 检测到的UI 个数
    /// </summary>
    /// <param name="vector2">鼠标位置：Input.mousePosition</param>
    /// <returns></returns>
    private int getCon(Vector2 vector2)
    {
        PointerEventData pointerEventData = new PointerEventData(es);
        pointerEventData.position = vector2;
        List<RaycastResult> result = new List<RaycastResult>();
        gra.Raycast(pointerEventData, result);
        return result.Count;
    }