屏幕旋转

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