unity加载初始场景界面显示进度

//private bool loadScene = false;
    public Text loadingText;
    public Slider sliderBar;
    // Start is called before the first frame update
    void Start()
    {
        StartCoroutine(LoadNewScene());
    }

    IEnumerator LoadNewScene()
    {
        AsyncOperation async = SceneManager.LoadSceneAsync("SampleScene");
        while(!async.isDone)
        {
            float progress = Mathf.Clamp01(async.progress / 0.9f);
            sliderBar.value = progress;
            loadingText.text = progress * 100.0f + "%";
            yield return null;
        }
    }