Unity 获取UI（RectTransform）四个角的屏幕坐标

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 Vector3[] corners = new Vector3[4];

		/// <summary>
        /// 左下、左上、右上、右下
        /// </summary>
        /// <param name="rt">ui</param>
        /// <param name="index">0、1、2、3</param>
        /// <returns></returns>
        private Vector3 GetCornerScreenPos(RectTransform rt, int index)
        {
            rt.GetWorldCorners(corners);
            Vector3 wPos = corners[index];
#if UNITY_EDITOR
            Debug.Log($"{rt.name}:wPos:{wPos}");
#endif
		    var UICanvas =rt.GetComponentInParent<Canvas>();
            Camera uCame = UICanvas.worldCamera;
            Vector3 screenPos = wPos;
            if (UICanvas.renderMode != RenderMode.ScreenSpaceOverlay && uCame !=null)
            {
                screenPos = uCame.WorldToScreenPoint(wPos);
            }
#if UNITY_EDITOR
            Debug.Log($"{rt.name}:screenPos:{screenPos}");
#endif
            return screenPos;
        }