图像按钮不会淡出

Question

我正在进行屏幕淡入和淡出过渡，目前我的舞台只包括背景图像和图像按钮（将来还会有一个按钮）。现在的问题是背景淡化工作，但不是图像按钮。任何想法我怎么能轻松＆＃34;分组＆＃34;所有的舞台都在一起，一下子消失了？这是我目前的代码：

public class MyActor extends Actor {

    @Override
    public void draw( SpriteBatch batch, float parentAlpha ) {
        batch.setColor( 1, 1, 1, 1*parentAlpha );

        batch.draw( AssetLoader.bg, 0, 0, ZBGame.VIRTUAL_WIDTH, ZBGame.VIRTUAL_HEIGHT );

        batch.draw( AssetLoader.zbLogo,
                    ZBGame.VIRTUAL_WIDTH / 2-140,
                    ZBGame.VIRTUAL_HEIGHT-AssetLoader.zbLogo.getRegionHeight(),
                    AssetLoader.zbLogo.getRegionWidth(),
                    AssetLoader.zbLogo.getRegionHeight());


        TextureAtlas buttons = new TextureAtlas( Gdx.files.internal("data/texture.txt") );
        Skin skin = new Skin( buttons );

        ImageButtonStyle btnStyle = new ImageButtonStyle();
        btnStyle.up = skin.getDrawable("startBtn");

        ImageButton button = new ImageButton(btnStyle);

        button.addListener(new InputListener( ) {
            public boolean touchDown(InputEvent event, float x, float y, int pointer, int button) {
                stage.addAction( Actions.sequence( Actions.fadeOut(.5f), Actions.run( new Runnable( ) {
                    @Override
                    public void run() {
                        game.setScreen(new OptionScreen( game ) );
                    }

                }) ) );
                return true;
            }
        stage.addActor(button);
    }
}

@Override
public void show() {
    stage = new Stage( );
    Gdx.input.setInputProcessor(stage);

    MyActor myActor = new MyActor( );
    stage.addActor(myActor);
    stage.addAction( Actions.sequence( Actions.alpha(0), Actions.fadeIn(1)) );
}

@Override
public void render(float delta) {
    Gdx.gl.glClearColor(1, 1, 1, 1);
    Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
    stage.act(delta);
    stage.draw();
}