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using UnityEditor;

using System.IO;

/// <summary>

///

/// </summary>

public class AssetBundleEditor

{

    //1.编译阶段插件声明

    [MenuItem("Assets/Build AssetBundles")]

    static void BuildAssetBundles() {

        string dir = "AssetBundles";

        if (!Directory.Exists(dir)) {

            //2.在工程根目录下创建dir目录

            Directory.CreateDirectory(dir);

        }

        //3.构建AssetBundle资源，AB资源包是一个压缩文件，可以把它看成是一个压缩的文件夹，里面

        //可能包含多个文件，预制件，材质，贴图，声音。

        BuildPipeline.BuildAssetBundles(dir, BuildAssetBundleOptions.None, BuildTarget.iOS);

    }

}

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/// <summary>

 ///读取原生沙盒Documents/AssetsBundle目录下的文件，Documents/AssetsBundle下的文件通过Native原生下载的资源

 /// </summary>

 /// <param name="abName">Documents/AssetsBundle下的ab文件</param>

 /// <returns>读取到的字符串</returns>

 public static AssetBundle GetNativeAssetFromDocumentsOnProDownLoad(string abName)

 {

     string localPath = "";

     if (Application.platform == RuntimePlatform.Android)

     {

         localPath = "jar:file://" + Application.persistentDataPath + "/AssetsBundle/" + abName;

     }

     else

     {

         localPath = "file://" + Application.persistentDataPath + "/AssetsBundle/" + abName;

     }

     UnityWebRequest request = UnityWebRequestAssetBundle.GetAssetBundle(localPath);

     var operation = request.SendWebRequest();

     while (!operation.isDone)

     { }

     if (request.result == UnityWebRequest.Result.ConnectionError)

     {

         Debug.Log(request.error);

         return null;

     }

     else

     {

         AssetBundle assetBundle = DownloadHandlerAssetBundle.GetContent(request);

         return assetBundle;

     }

     //UnityWebRequest request = UnityWebRequestAssetBundle.GetAssetBundle(localPath);

     //yield return request.Send();

     //AssetBundle assetBundle = DownloadHandlerAssetBundle.GetContent(request);

     //return assetBundle;

 }

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public