unity之AssetBundle

第一步：创建AssetBundle包

把预制件设置为AssetBundle格式，然后在Editor文件夹下新建CreatAssetBundles.cs文件。

using UnityEditor;       //1.引入Editor和IO两个命名空间
using System.IO;

public class CreatAssetBundles{
    //2.创建编辑器在Assets选项下建个AssetBundles
    [MenuItem("Assets/Build AssetBundles")]

    static void BuildAllBundles()
    {
        //判断AssetBundles文件夹是否存在，如果不存在，新建AssetBundles文件夹，文件夹在工程根目录下
        string dir = "AssetBundles";
        if (Directory.Exists(dir) == false)
        {
            Directory.CreateDirectory(dir);
        }
        //3.创建AssetBundle文件
        BuildPipeline.BuildAssetBundles(dir, BuildAssetBundleOptions.None, BuildTarget.StandaloneWindows64);
        //生成四个文件
    }
}

第二步：加载AssetBundle包，有三种方法，从文件加载，从内存加载，从网络加载WWW加载，UnityWebRequest加载

（1）从本地加载AssetBundle包

新建LoadFromFileExample.cs文件，挂在主相机上。

    void Start()
    {
        //从文件加载
        AssetBundle ab = AssetBundle.LoadFromFile("Assetbundle/cube.unity3d");           //加载assetbundle包  
        GameObject cubeprefab = ab.LoadAsset<GameObject>("cube");                       //加载assetbundle包里包含的预制件  
        Instantiate(cubeprefab);  
    }

（2）从内存加载（引入System.IO命名空间）

    void Start()
    {
        //同步内存加载
        string path = "AssetBundles/cube.unity3d";
        AssetBundle ab = AssetBundle.LoadFromMemory(File.ReadAllBytes(path));
        GameObject cubePrefab = ab.LoadAsset<GameObject>("Cube");
        Instantiate(cubePrefab);
    }

    IEnumerator Start()
    {
        //异步内存加载
        string path = "AssetBundles/cube.unity3d";
        AssetBundleCreateRequest request = AssetBundle.LoadFromMemoryAsync(File.ReadAllBytes(path));
        yield return request;
        AssetBundle ab = request.assetBundle;
        
        GameObject cubePrefab = ab.LoadAsset<GameObject>("Cube");
        Instantiate(cubePrefab);
    }

（3）通过WWW.LoadFromCacheOrDownload加载（即将被弃用）

（4）通过UnityWebRequest加载

首先用netbox1.exe搭建简单的服务器。然后引入UnityEngine.Networking命名空间

    IEnumerator Start()
    {
        //string uri = @"file:///D:\My Projects\SikiAssetBundleParctice\AssetBundles\cube.unity3d";
        string uri = @"http://localhost/AssetBundles/cube.unity3d";

        UnityWebRequest request = UnityWebRequest.GetAssetBundle(uri);
        yield return request.Send();
        AssetBundle ab = DownloadHandlerAssetBundle.GetContent(request);
        //AssetBundle ab = (request.downloadHandler as DownloadHandlerAssetBundle).assetBundle;

        GameObject cubePrefab = ab.LoadAsset<GameObject>("Cube");
        Instantiate(cubePrefab);
    }

ps:保存 requset.downloadHandle.data...

保存文件 File.WriteAllbytes....

       //使用AssetBundle来加载依赖的包
        AssetBundle manifestAB = AssetBundle.LoadFromFile("AssetBundles/AssetBundles");
        AssetBundleManifest manifest = manifestAB.LoadAsset<AssetBundleManifest>("AssetBundleManifest");
        string[] strs = manifest.GetAllDependencies("cube.unity");
        foreach(string name in strs)
        {
            print(name);
            AssetBundle.LoadFromFile("AssetBundles/" + name);
        }

第三步：AssetBundle的卸载
卸载有两个方面
1，减少内存使用
2，有可能导致丢失
所以什么时候去卸载资源
AssetBundle.Unload(true)卸载所有资源，即使有资源被使用着
（1，在关切切换、场景切换2，资源没被用的时候调用）
AssetBundle.Unload(false)卸载所有没用被使用的资源
个别资源怎么卸载1，通过 Resources.UnloadUnusedAssets. 2，场景切换的时候
ps：AssetBundle浏览工具

下载地址：https://github.com/Unity-Technologies/AssetBundles-Browser

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