进度条

public UISlider slider;   //滑动条 
    public GameObject progressBar;//进度条
    

    void Start()
    {
        progressBar.SetActive(false);//滑动条不激活
    }

    public void SetLoadingPercentage(float value)//传入滑动条Value值
    {
        slider.value = value;
    }

    public void LoadGame()//进入游戏
    {    
            progressBar.SetActive(true);//激活滑动条                   
            StartCoroutine(StartLoading(1));//调用协程
        
    }     
    private IEnumerator StartLoading(int scene)
    {
        int displayProgress = 0;//展示的进度
        int toProgress = 0;//实际的进度
    
        AsyncOperation op = Application.LoadLevelAsync(scene);//异步加载
         
        op.allowSceneActivation = false;//禁止Unity加载完毕后自动切换场景
        //PS：把allowSceneActivation设置为false后，Unity就只会加载场景到90%，剩下的10%要等到allowSceneActivation设置为true后才加载          
        toProgress = (int)op.progress * 100;//实际加载进度
        while (displayProgress < toProgress)//让滑动条数值大于加载进度，这样看起来滑动条就平滑点
        {
            ++displayProgress;
            SetLoadingPercentage(displayProgress / 100f);//传入滑动条数值
            yield return new WaitForEndOfFrame();// 等待帧结束
        }       
        //剩下的10%进度
        toProgress = 100;
        while (displayProgress < toProgress)
        {
            ++displayProgress;
            SetLoadingPercentage(displayProgress / 100f);
            yield return new WaitForEndOfFrame();
        }
        op.allowSceneActivation = true;
    }