AssetBundle加载资源的过程

参考：http://blog.csdn.net/jason_520/article/details/54616953

AssetBundle加载资源的过程

1、加载总Manifest文件；
2、获取相关依赖文件列表；
3、加载所有相关依赖文件；
4、加载目标资源；
5、卸载所有相关依赖文件。

参考代码如下：

 IEnumerator LoadAsset()    {        //首先加载总Manifest文件;            WWW wwwAll = new WWW(BundleURL+ "StreamingAssets");        yield return wwwAll;        if (!string.IsNullOrEmpty(wwwAll.error))        {            Debug.LogError(wwwAll.error);        }        else        {            AssetBundle ab = wwwAll.assetBundle;            AssetBundleManifest manifest = (AssetBundleManifest)ab.LoadAsset("AssetBundleManifest");            ab.Unload(false);            //获取依赖文件列表;                string[] depends = manifest.GetAllDependencies("cube.unity3d");            AssetBundle[] dependsAssetBundle = new AssetBundle[depends.Length];            for (int index = 0; index < depends.Length; index++)            {                //加载所有的依赖文件;                    WWW dwww = WWW.LoadFromCacheOrDownload(BundleURL + depends[index], 0);                yield return dwww;                dependsAssetBundle[index] = dwww.assetBundle;            }            //加载我们需要的文件;                WWW www = new WWW(BundleURL + "cube.unity3d");            yield return www;            if (!string.IsNullOrEmpty(www.error))            {                Debug.LogError(www.error);            }            else            {                AssetBundle assetBundle = www.assetBundle;                AssetBundleRequest request = assetBundle.LoadAssetAsync("cube", typeof(GameObject));                // Wait for completion                yield return request;                // Get the reference to the loaded object                GameObject obj = request.asset as GameObject;                Instantiate(obj);                assetBundle.Unload(false);            }            //卸载依赖文件的包                for (int index = 0; index < depends.Length; index++)            {                dependsAssetBundle[index].Unload(false);            }        }    }