游戏屏幕朝向

　　public void SetOrientation()
    {
        if (Input.deviceOrientation == DeviceOrientation.LandscapeLeft)     //处理横向两个方向旋转
        {
            if (Screen.orientation != ScreenOrientation.LandscapeLeft)
            {
                Screen.orientation = ScreenOrientation.LandscapeLeft;
            }
        }
        else if (Input.deviceOrientation == DeviceOrientation.LandscapeRight)
        {
            if (Screen.orientation != ScreenOrientation.LandscapeRight)
            {
                Screen.orientation = ScreenOrientation.LandscapeRight;
            }

        }
        else if (Input.deviceOrientation == DeviceOrientation.Portrait)     //处理纵向两个方向的旋转
        {
            if (Screen.orientation != ScreenOrientation.Portrait)
            {
                Screen.orientation = ScreenOrientation.Portrait;
            }
        }
        else if (Input.deviceOrientation == DeviceOrientation.PortraitUpsideDown)
        {
            if (Screen.orientation != ScreenOrientation.PortraitUpsideDown)
            {
                Screen.orientation = ScreenOrientation.PortraitUpsideDown;
            }
        }
    }

        // 当orientation为AutoRotation时，可以分别设置四个朝向的开关
        Screen.orientation = ScreenOrientation.AutoRotation;
        Screen.autorotateToLandscapeLeft = true;
        Screen.autorotateToLandscapeRight = true;
        Screen.autorotateToPortrait = false;
        Screen.autorotateToPortraitUpsideDown = false;