UGUI関数Input.mousePositionをクリックすると、クリックした位置に画像が生成されます

    private void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            if (!LevelManager.instance.isClickItem)
            {
                //Debug.Log(Input.mousePosition);
                var go = Instantiate(m_error);//生成图片
                go.transform.localPosition = Vector3.zero;
                go.transform.SetParent(transform, false);
                //go.transform.position = Input.mousePosition;
                var canvas = UIManager.Instance.UICanvas;
                Vector2 uisize = canvas.GetComponent<RectTransform>().sizeDelta;//得到画布的尺寸
                Vector2 screenpos = Input.mousePosition;
                Vector2 screenpos2;
                screenpos2.x = screenpos.x - (Screen.width / 2);//转换为以屏幕中心为原点的屏幕坐标
                screenpos2.y = screenpos.y - (Screen.height / 2);
                Vector2 uipos;//UI坐标
                uipos.x = screenpos2.x * (uisize.x / Screen.width);//转换后的屏幕坐标*画布与屏幕宽高比
                uipos.y = screenpos2.y * (uisize.y / Screen.height);

                Debug.Log(uipos);
                go.transform.localPosition = uipos;
                UIHelper.SetActive(true, go);
            }
            else
            {
                LevelManager.instance.isClickItem = false;
            }            
        }
    }