public override IEnumerator LoadAssetBundle(string assetBundleName, Func <bool, IEnumerator> onComplete)
            {
                if (HasCache(assetBundleName))
                {
                    if (!IsAssetBundleLoaded(assetBundleName))
                    {
                        yield return(BundleDownloadCompleted(true, AssetBundlesFileSystem.GetFullPath(assetBundleName)));
                    }
                    yield return(onComplete.Invoke(true));
                }
                else
                {
                    AssetBundlesDownloader downloader = new AssetBundlesDownloader(_baseUrl, AssetBundlesFileSystem.GetFullPath(assetBundleName));
                    yield return(downloader.DownloadFromName(assetBundleName, BundleDownloadCompleted));

                    yield return(onComplete.Invoke(_assetBundles.ContainsKey(assetBundleName)));
                }
            }