public void ShowUI() { foreach (UIButton button in buttons) { button.RegisterTo(drawer); } foreach (UIWall uiWall in uiWalls) { uiWall.RegisterTo(drawer); } if (food != null) { uiFood.RegisterTo(drawer); } if (uiPlayer != null) { uiPlayer.RegisterTo(drawer); } if (uiAIPlayer != null) { uiAIPlayer.RegisterTo(drawer); } if (btnPause != null) { btnPause.RegisterTo(drawer); } }