IOS上使用如下方法实现的截屏功能，为什么真实背景是上下颠倒的，而识别出物体方向是正常的！

Question

RenderTexture render = new RenderTexture(Screen.width, Screen.height,0);
            Camera.main.targetTexture = render;
            Camera.main.Render();
            RenderTexture.active = render;