StartCoroutine(GetDepends(host, "AB_Andriod_LZ4"));

/// <summary>/// 服务器地址/// </summary>string host = @"https://ab-test-1258795305.cos.ap-shanghai.myqcloud.com/";/// <summary>/// ab-依赖/// </summary>public Dictionary<string/*ab path*/, AB_DATA> dic_AB = new Dictionary<string, AB_DATA>();/// <summary>/// 获取主依赖，本地存储依赖关系，下载全部ab/// </summary>/// <param name="host_path">服务器根地址</param>/// <param name="dir_name">服务器下ab根文件名，以及主ab文件名称</param>/// <returns></returns>IEnumerator GetDepends(string host_path, string dir_name){dic_AB.Clear();//目录跟路径string root_path = host_path + "/" + dir_name;//获取主ab，拿到manifest获取依赖关系AssetBundleManifest assetBundleManifestServer = null;  //服务器 总的依赖关系    UnityWebRequest ServerManifestWWW = UnityWebRequestAssetBundle.GetAssetBundle(root_path + "/" + dir_name);Debug.Log("HTTP : " + ServerManifestWWW.url.ToString());yield return ServerManifestWWW.SendWebRequest();assetBundleManifestServer = (AssetBundleManifest)DownloadHandlerAssetBundle.GetContent(ServerManifestWWW).LoadAsset("AssetBundleManifest");//存储各依赖关系string[] depends_name = assetBundleManifestServer.GetAllAssetBundles();for (int i = 0; i < depends_name.Length; i++){AB_DATA ab_data = new AB_DATA();ab_data.name = depends_name[i];UnityWebRequest target_uwq = UnityWebRequestAssetBundle.GetAssetBundle(Path.Combine(root_path, ab_data.name));yield return target_uwq.SendWebRequest();if (target_uwq.isDone){//下载ab到本地StartCoroutine(DownLoadAssetBundelAbdSave(Path.Combine(root_path, ab_data.name)));//dependsvar depends = assetBundleManifestServer.GetAllDependencies(ab_data.name);ab_data.depends_name = new string[depends.Length];for (int j = 0; j < depends.Length; j++){ab_data.depends_name[j] = depends[j];}dic_AB.Add(depends_name[i], ab_data);}}}

  /// <summary>/// 下载AB文件并保存到本地/// </summary>/// <returns></returns>IEnumerator DownLoadAssetBundelAbdSave(string url){WWW www = new WWW(url);yield return www;if (www.isDone){//表示资源下载完毕使用IO技术把www对象存储到本地SaveAssetBundle(Path.GetFileName(url), www.bytes, www.bytes.Length);}}/// <summary>/// 存储AB文件到本地/// </summary>private void SaveAssetBundle(string fileName, byte[] bytes, int count){string dir_path = Application.persistentDataPath + "/" + fileName;Debug.Log("存储路径 ： " + dir_path);Stream sw = null;FileInfo fileInfo = new FileInfo(dir_path);sw = fileInfo.Create();sw.Write(bytes, 0, count);sw.Flush();sw.Close();sw.Dispose();Debug.Log(fileName + "下载并存储完成");}

 private void LoadStream_OnClick(){//设置要加载的目标物体名string ab_name = "tom.prefab";string dir_path = Application.persistentDataPath + "/" + ab_name;//从已缓存的字节文件中加载tomStartCoroutine(LoadABFormStream(dir_path));//加载tom所需的依赖string[] ad_names = dic_AB[ab_name].depends_name;for (int i = 0; i < ad_names.Length; i++){string dir_path_depends = Path.Combine(Application.persistentDataPath, ad_names[i]);//加载依赖时，直接加载出其ab包即可，不需要分解其依赖类型再去实例，unity自会处理AssetBundle.LoadFromFile(dir_path_depends);//所以下面部分就不需要了// StartCoroutine(LoadABFormStream(dir_path_depends));}}

/// <summary>/// 从字节文件读取ab，并且实例化/// </summary>/// <param name="dir_path"></param>/// <returns></returns>IEnumerator LoadABFormStream(string dir_path){FileStream fileStream = new FileStream(dir_path, FileMode.Open, FileAccess.Read);AssetBundleCreateRequest request = AssetBundle.LoadFromStreamAsync(fileStream);yield return request;AssetBundle myLoadedAssetBundle = request.assetBundle;if (myLoadedAssetBundle == null){Debug.Log("Failed to load AssetBundle!");yield break;}//实例化abInstanceAB_FormAssetBundle(myLoadedAssetBundle, myLoadedAssetBundle.name);fileStream.Close();}private void InstanceAB_FormAssetBundle(AssetBundle assetBundle, string obj_name){Object gameObject = null;if (obj_name.Contains(".mat")){gameObject = assetBundle.LoadAsset<Material>(obj_name);Instantiate<Material>((Material)gameObject);}else if (obj_name.Contains(".prefab")){gameObject = assetBundle.LoadAsset<GameObject>(obj_name);Instantiate<GameObject>((GameObject)gameObject);}}