我正在开发一个小duengon爬虫，我想尝试使用Scene2D实现一个健康栏。但是有一个问题......当我尝试将进度条的大小设置为永远相同的大小时，如果我这样做无关紧要：
healthBar.setWidth(1f);
healthBar.setHeight(0.25f);
or
healthBar.setWidth(100);
healthBar.setHeight(25);
我做错了什么？继承人我是如何创造舞台的^^
camera = new OrthographicCamera(0,0);
camera.setToOrtho(false,Gdx.graphics.getWidth()/Box2dVars.UNIT,Gdx.graphics.getHeight()/Box2dVars.UNIT);
camera.zoom = (float) 0.75;
port = new ExtendViewport(camera.viewportWidth, camera.viewportHeight, camera);
stage = new Stage(port);
我还会在渲染方法中的每个刻度上绘制并绘制舞台。以下是我如何创建ProgressBar：
skin = new Skin(Gdx.files.internal("Scene2D-Skins/uiskin.json"));
healthBar = new ProgressBar(0, 100, 0.5f, false, skin, "default");
healthBar.setWidth(1f);
healthBar.setHeight(0.25f);
healthBar.setPosition(this.getPosition().x, this.getPosition().y);
this.gameScreen.stage.addActor(healthBar);