异步加载场景带进度条

    public Slider slider;//进度条
    public Text text;//百分制显示进度加载情况
public void StartGame(int index)
    {      
        StartCoroutine(loginMy(index));
    }
/// <summary>
    /// 切换场景加载
    /// </summary>
    /// <param name="index">场景代码</param>
    /// <returns></returns>
    IEnumerator loginMy(int index)
    {
        int displayProgress = 0;
        int toProgress = 0;
        AsyncOperation op = SceneManager.LoadSceneAsync(index); //此处改成要加载的场景名
        op.allowSceneActivation = false;
        while (op.progress < 0.9f) //此处如果是 <= 0.9f 则会出现死循环所以必须小0.9
        {
            toProgress = (int)op.progress * 100;
            while (displayProgress < toProgress)
            {
                ++displayProgress;
                SetLoadingPercentage(displayProgress);
                yield return new WaitForEndOfFrame();
            }
        }
        toProgress = 100;
        while (displayProgress < toProgress)
        {
            ++displayProgress;
            SetLoadingPercentage(displayProgress);
            yield return new WaitForEndOfFrame();
        }
        op.allowSceneActivation = true;

    }
    /// <summary>
    /// 显示进度
    /// </summary>
    /// <param name="displayProgress">进度值</param>
    private void SetLoadingPercentage(int displayProgress)
    {
        slider.value = displayProgress;
        text.text = displayProgress.ToString() + "%";
    }   

  进度条就是ui里面的slider组件，然后自己加个text进行显示百分比，背景什么的可以用image做，

自己添加一个button按钮组件进行委托或者拖拽的方式加入单击事件进行运行。