unity 资源热更新+显示进度条：根据uri下资源

我就是我 2022-05-31 12:40 170阅读 0赞

实现传入uri，下载对应的资源，并且能支持多个uri的下载  
例如：

List<string> listUri = new List<string>();
            List<string> listToPath = new List<string>();
            listUri.Add(AppConst.WebUrlVideo + "/2.mp4");
            listToPath.Add(AppConst.DataPath + "/2.mp4");
    
            listUri.Add(AppConst.WebUrlVideo + "/3.mp4");
            listToPath.Add(AppConst.DataPath + "/3.mp4");
            DownMgr.Instance.DownResMulti(listUri, listToPath);

下载2个视频，

## 实现效果 ##

![这里写图片描述][70bbbad345f42221239b36c975d2086c.png]  
![这里写图片描述][4d556f55b4d1df567cd5b93d27f92353.png]

## DownMgr.cs 下载管理器 ##

public void DownResMulti(List<string> listUri,List<string> listToPath,UnityEvent onDownOk = null)
        {
            DataMgr.m_isMultiDown = true;
            StartCoroutine(YieldDownResMulti(listUri, listToPath, onDownOk));
        }
    
        IEnumerator YieldDownResMulti(List<string> listUri,List<string> listToPath,UnityEvent onDownOk = null)
        {
            long countLength = 0;
            int cnt = 0;
            for (int i = 0; i < listUri.Count; i++)
            {
                System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(listUri[i]);
                request.Method = "HEAD";
                countLength += request.GetResponse().ContentLength;
                cnt++;
            }
    
            PrecentMgr.m_instance.m_totalLen = countLength;
            Debug.Log("总下载量:" + countLength);
            Debug.Log("下载个数:" + cnt);
    
            for (int i = 0; i < listUri.Count; i++)
            {
                BeginDownload(listUri[i], listToPath[i]);
                while( !(IsDownOK(listToPath[i])))
                {
                    yield return new WaitForEndOfFrame();
                }
            }
            yield return new WaitForEndOfFrame();
            if (onDownOk != null)
                onDownOk.Invoke();
        }
        
       void BeginDownload(string url, string file)
        {     //线程下载
            object[] param = new object[2] { url, file };
    
            ThreadEvent ev = new ThreadEvent();
            ev.Key = NotiConst.UPDATE_DOWNLOAD;
            ev.evParams.AddRange(param);
            ThreadManager.Instance.AddEvent(ev, OnThreadCompleted);   //线程下载
        }
    
        void OnThreadCompleted(NotiData data)
        {
            switch (data.evName)
            {
                case NotiConst.UPDATE_EXTRACT:  //解压一个完成
                                                //
                    break;
                case NotiConst.UPDATE_DOWNLOAD: //下载一个完成
                    downloadFiles.Add(data.evParam.ToString());
                    break;
            }
        }
    
        /// <summary>
        /// 是否下载完成
        /// </summary>
        bool IsDownOK(string file)
        {
            return downloadFiles.Contains(file);
        }

1.遍历uri，使用System.Net.HttpWebRequest得到下载的总量  
2.放入线程中进行依次下载，（下载完一个再下载另一个）  
3.全部下载完执行UnityEvent事件

## ThreadManager.cs 下载线程 ##

/// <summary>
        /// 下载文件
        /// </summary>
        void OnDownloadFile(List<object> evParams) {
            string url = evParams[0].ToString();    
            currDownFile = evParams[1].ToString();
    
            using (WebClient client = new WebClient()) {
                sw.Start();
                client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(ProgressChanged);
                client.DownloadFileAsync(new System.Uri(url), currDownFile);
            }
        }
    
        private void ProgressChanged(object sender, DownloadProgressChangedEventArgs e)
        {
            DataMgr.m_downCur += (e.BytesReceived - m_lastDown);
            m_lastDown = e.BytesReceived;
            string value = string.Format("{0} kb/s", (e.BytesReceived / 1024d / sw.Elapsed.TotalSeconds).ToString("0.00"));
            
            if (DataMgr.m_isMultiDown == false)
            {
                //下载的总量
                PrecentData preData = new PrecentData();
                preData.total = string.Format("{0} MB / {1} MB", (e.BytesReceived / 1024d / 1024d).ToString("0.00"), (e.TotalBytesToReceive / 1024d / 1024d).ToString("0.00"));
                preData.precent = (float)e.BytesReceived / (float)e.TotalBytesToReceive;
    
                preData.speed = value;
    
                Loom.QueueOnMainThread((param) =>
              {
                  NotificationCenter.Get().ObjDispatchEvent(KEventKey.m_evDownload, preData);
              }, null);
            }
            else if (DataMgr.m_isMultiDown == true)
            {
                Loom.QueueOnMainThread((param) =>
               {
                   PrecentMgr.m_instance.UpdateMultiDown(value);
               }, null);
            }
            //正在下载显示进度
            //NotiData data = new NotiData(NotiConst.UPDATE_PROGRESS, value);
            //if (m_SyncEvent != null) m_SyncEvent(data);
    
            //下载一个完成
            if (e.ProgressPercentage == 100 && e.BytesReceived == e.TotalBytesToReceive) {
                sw.Reset();
                m_lastDown = 0;
                NotiData data = new NotiData(NotiConst.UPDATE_DOWNLOAD, currDownFile);
                if (m_SyncEvent != null) m_SyncEvent(data);
            }
        }

1.线程中每次取下载队列中的队头进行下载  
2.使用WebClient得到当前下载文件的信息，包括当前下载速度，每一时刻下载量（传递给ui显示）  
3.当当前文件下载完成时调用委托m\_SyncEvent，告诉DownMgr此文件下载完，进行下一个下载uri的循环

## PrecentMgr.cs 进度条显示 ##

public void UpdateMultiDown(string speed)
        {
            float precent = (float)DataMgr.m_downCur / (float)m_totalLen;
            m_imgPrecent.fillAmount = precent;
            string sPrecent = string.Format("{0} MB / {1} MB", (DataMgr.m_downCur / 1024d / 1024d).ToString("0.00"), (m_totalLen / 1024d / 1024d).ToString("0.00"));
            m_textSpeed.text = speed;
            m_textPrecent.text = sPrecent;
            if (precent >= 1.0f)
            {
                Destroy(gameObject);
            }
        }

根据传递过来的数据显示：百分比，下载速度，已下载量与总量

代码下载：  
http://download.csdn.net/download/luoyikun/10257944

[70bbbad345f42221239b36c975d2086c.png]: /images/20220531/88e637bc4e3e4ff2a2c4c8ef1b73e3a2.png
[4d556f55b4d1df567cd5b93d27f92353.png]: /images/20220531/cf70e3710520480191f98223c8cd9be2.png