private IEnumerator DownLoad()
        {
            // 解析APP里的补丁清单
            string         filePath   = AssetPathHelper.MakeStreamingLoadPath(PatchDefine.PatchManifestFileName);
            string         url        = AssetPathHelper.ConvertToWWWPath(filePath);
            WebDataRequest downloader = new WebDataRequest(url);

            yield return(downloader.DownLoad());

            if (downloader.States == EWebRequestStates.Success)
            {
                PatchHelper.Log(ELogLevel.Log, "Parse app patch manifest.");
                _patcher.ParseAppPatchManifest(downloader.GetText());
                downloader.Dispose();
                _patcher.SwitchNext();
            }
            else
            {
                throw new System.Exception($"Fatal error : Failed download file : {url}");
            }
        }
        /// <summary>
        /// 异步初始化
        /// </summary>
        public IEnumerator InitializeAync(PatchManagerImpl patcher)
        {
            // 处理沙盒被污染
            ProcessSandboxDirty();

            // 分析APP内的补丁清单
            {
                string         filePath   = AssetPathHelper.MakeStreamingLoadPath(PatchDefine.PatchManifestBytesFileName);
                string         url        = AssetPathHelper.ConvertToWWWPath(filePath);
                WebDataRequest downloader = new WebDataRequest(url);
                yield return(downloader.DownLoad());

                if (downloader.States == EWebRequestStates.Success)
                {
                    MotionLog.Log("Parse app patch manifest.");
                    patcher.ParseAppPatchManifest(downloader.GetData());
                    downloader.Dispose();
                }
                else
                {
                    throw new System.Exception($"Fatal error : Failed download file : {url}");
                }
            }

            // 分析沙盒内的补丁清单
            if (PatchHelper.CheckSandboxPatchManifestFileExist())
            {
                string filePath = AssetPathHelper.MakePersistentLoadPath(PatchDefine.PatchManifestBytesFileName);
                byte[] fileData = File.ReadAllBytes(filePath);
                MotionLog.Log($"Parse sandbox patch file.");
                patcher.ParseSandboxPatchManifest(fileData);
            }
            else
            {
                patcher.ParseSandboxPatchManifest(patcher.AppPatchManifest);
            }
        }