EventSystem eventSystem;
public GraphicRaycaster RaycastInCanvas;
bool CheckGuiRaycastObjects()//测试UI射线
{

    PointerEventData eventData = new PointerEventData(eventSystem);

    eventData.pressPosition = Input.mousePosition;

    eventData.position = Input.mousePosition;

    List<RaycastResult> list = new List<RaycastResult>();

    RaycastInCanvas.Raycast(eventData, list);

    //Debug.Log(list.Count);

    return list.Count > 0;

}

···

返回为真表示点击在ui上