Unity經過世界座標系轉換到界面座標位置

public static Vector2 WorldToCanvasPoint(Canvas canvas, Vector3 worldPos)
    {
        Vector2 pos;
        RectTransformUtility.ScreenPointToLocalPointInRectangle(canvas.transform as RectTransform,
            Camera.main.WorldToScreenPoint(worldPos), canvas.worldCamera, out pos);
        return pos;
    }