Unity设置屏幕自动旋转，并设置支持的方向

Screen.orientation = ScreenOrientation.AutoRotation;//设置方向为自动(根据需要自动旋转屏幕朝向任何启用的方向。)
Screen.autorotateToLandscapeRight = true;           //允许自动旋转到右横屏
Screen.autorotateToLandscapeLeft = true;            //允许自动旋转到左横屏
Screen.autorotateToPortrait = false;                //不允许自动旋转到纵向
Screen.autorotateToPortraitUpsideDown = false;      //不允许自动旋转到纵向上下
Screen.sleepTimeout = SleepTimeout.NeverSleep;      //睡眠时间为从不睡眠