下载某资源文件并加载其中的所有Prefab到场景中

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;

 /// <summary>
 /// LoadAssets打开某资源文件并加载其中的所有Prefab到场景中
 /// </summary>
 public class LoadAssets : MonoBehaviour
 {
     [HideInInspector]
     public string address;//资源所在文件夹路径
     public string fileToLoad;//资源文件名
     private string manifestAssetBundleName;//Manifest文件，一般与所在文件夹名称相同
     private AssetBundleManifest manifest;
     private List<AssetBundle> assetBundles = new List<AssetBundle>();

     private void Awake()
     {
         if(address.Equals(""))
             return;
         //Manifest文件的名称与生成的AssetBundle所在的文件夹同名
         string[] ss = address.Split('/');
         manifestAssetBundleName = ss[ss.Length - ];
         LoadManifest(address + manifestAssetBundleName);
         LoadDepend(fileToLoad);

     }
     void OnGUI()
     {
         if (address.Equals(""))
             return;
         //第1步：读取Manifest
         if (GUILayout.Button("地图加载（选择map.unity3d）"))
         {
             StartCoroutine(LoadObj(address, fileToLoad));
             Caching.CleanCache();
         }
     }
     //同步下载并读取Manifest文件
     public void LoadManifest(string mainfestpath)
     {
         //Debug.Log("LoadManifest:"+mainfestpath);
         AssetBundle manifestBundle = AssetBundle.LoadFromFile(mainfestpath);
         if (manifestBundle != null)
         {
             manifest = (AssetBundleManifest)manifestBundle.LoadAsset("AssetBundleManifest");
         }
     }
     //获取资源所依赖的资源并下载
     void LoadDepend(string assetName)
     {
         string[] dps = manifest.GetAllDependencies(assetName);
         for (int i = ; i < dps.Length; i++)
         {
             StartCoroutine(LoadAsset(address, dps[i]));
         }
     }
     //下载资源
     IEnumerator LoadAsset(string url, string fileName)
     {
         //Debug.Log("LoadAsset:" + url+" "+fileName);
         WWW www = WWW.LoadFromCacheOrDownload("file://" + url + fileName, manifest.GetAssetBundleHash(fileName));
         yield return www;
         assetBundles.Add(www.assetBundle);
         www.Dispose();
     }
     //下载并实例化游戏对象
     IEnumerator LoadObj(string url, string fileName)
     {
         //Debug.Log("LoadOBJ:" + url + " " + fileName);

         WWW www = WWW.LoadFromCacheOrDownload("file://" + url + fileName, manifest.GetAssetBundleHash(fileName));
         yield return www;
         string[] AssetsNames = www.assetBundle.GetAllAssetNames();
         foreach (string m in AssetsNames)
         {
             GameObject prefab = www.assetBundle.LoadAsset(m) as GameObject;
             GameObject obj = GameObject.Instantiate(prefab);
         }

         assetBundles.Add(www.assetBundle);
         www.Dispose();
         UnloadUnuseAssetBundle();
     }
     //清理未使用资源所占用的内存
     void UnloadUnuseAssetBundle()
     {
         foreach (var item in assetBundles)
         {
             item.Unload(false);
         }
     }
 }