Unity5.x版本AssetBundle加载研究

之前说了 “Unity5.x版本AssetBundle打包研究”,没看过的请先看一下：http://www.shihuanjue.com/?p=57
再来看本文，有一定的连接性。

先梳理一下思路：
要加载一个资源A，必须先去加载它的所有依赖资源
要知道这个资源A依赖了哪些资源，必须先去加载AssetBundleManifest
通过AssetBundleManifest对象的GetAllDependencies(A)方法，获取它依赖的所有资源。
依赖资源都加载了，就可以去真正加载资源A了。

注意点：
1.资源A加载完了后，要记得Unload(false)，资源A的依赖资源要在 资源A加载完成后，才能Unload(false),否则无法正常加载资源A
2.不Unload的话也可以，那就自己做一个字典记录所有加载过的AssetBundle，还有它们的引用计数器。那样就可以先判断是否存在，然后再确定是否要去加载。

我下面的例子，采用1的方式。就是加载完了后就Unload的方式。
上代码

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System;
 
public class AssetBundleLoaderMgr : Singleton<AssetBundleLoaderMgr>
{
    public string m_assetPath = Application.streamingAssetsPath;
    string assetTail = ".unity3d";
 
    #region LoadAssetBundle
 
    /// <summary>
    /// 加载目标资源
    /// </summary>
    /// <param name="name"></param>
    /// <param name="callback"></param>
    public void LoadAssetBundle(string name, Action<UnityEngine.Object> callback)
    {
        name = name + assetTail;//eg:ui/panel.unity3d
 
        Action<List<AssetBundle>> action = (depenceAssetBundles) =>
        {
 
            string realName = this.GetRuntimePlatform() + "/" + name;//eg:Windows/ui/panel.unity3d
 
            LoadResReturnWWW(realName, (www) =>
            {
                int index = realName.LastIndexOf("/");
                string assetName = realName.Substring(index + 1);
                assetName = assetName.Replace(assetTail, "");
                AssetBundle assetBundle = www.assetBundle;
                UnityEngine.Object obj = assetBundle.LoadAsset(assetName);//LoadAsset(name）,这个name没有后缀,eg:panel
 
                //卸载资源内存
                assetBundle.Unload(false);
                for (int i = 0; i < depenceAssetBundles.Count; i++)
                {
                    depenceAssetBundles[i].Unload(false);
                }
 
                //加载目标资源完成的回调
                callback(obj);
            });
 
        };
 
        LoadDependenceAssets(name, action);
    }
 
    /// <summary>
    /// 加载目标资源的依赖资源
    /// </summary>
    /// <param name="targetAssetName"></param>
    /// <param name="action"></param>
    private void LoadDependenceAssets(string targetAssetName, Action<List<AssetBundle>> action)
    {
        Debug.Log("要加载的目标资源:" + targetAssetName);//ui/panel.unity3d
        Action<AssetBundleManifest> dependenceAction = (manifest) =>
        {
            List<AssetBundle> depenceAssetBundles = new List<AssetBundle>();//用来存放加载出来的依赖资源的AssetBundle
 
            string[] dependences = manifest.GetAllDependencies(targetAssetName);
            Debug.Log("依赖文件个数：" + dependences.Length);
            int length = dependences.Length;
            int finishedCount = 0;
            if (length == 0)
            {
                //没有依赖
                action(depenceAssetBundles);
            }
            else
            {
                //有依赖，加载所有依赖资源
                for (int i = 0; i < length; i++)
                {
                    string dependenceAssetName = dependences[i];
                    dependenceAssetName = GetRuntimePlatform() + "/" + dependenceAssetName;//eg:Windows/altas/heroiconatlas.unity3d
 
                    //加载，加到assetpool
                    LoadResReturnWWW(dependenceAssetName, (www) =>
                    {
                        int index = dependenceAssetName.LastIndexOf("/");
                        string assetName = dependenceAssetName.Substring(index + 1);
                        assetName = assetName.Replace(assetTail, "");
                        AssetBundle assetBundle = www.assetBundle;
                        UnityEngine.Object obj = assetBundle.LoadAsset(assetName);
                        //assetBundle.Unload(false);
                        depenceAssetBundles.Add(assetBundle);
 
                        finishedCount++;
 
                        if (finishedCount == length)
                        {
                            //依赖都加载完了
                            action(depenceAssetBundles);
                        }
                    });
                }
            }
        };
        LoadAssetBundleManifest(dependenceAction);
    }
 
    /// <summary>
    /// 加载AssetBundleManifest
    /// </summary>
    /// <param name="action"></param>
    private void LoadAssetBundleManifest(Action<AssetBundleManifest> action)
    {
        string manifestName = this.GetRuntimePlatform();
        manifestName = manifestName + "/" + manifestName;//eg:Windows/Windows
        LoadResReturnWWW(manifestName, (www) =>
        {
            AssetBundle assetBundle = www.assetBundle;
            UnityEngine.Object obj = assetBundle.LoadAsset("AssetBundleManifest");
            assetBundle.Unload(false);
            AssetBundleManifest manif = obj as AssetBundleManifest;
            action(manif);
        });
    }
    #endregion
 
    #region ExcuteLoader
    public void LoadResReturnWWW(string name, Action<WWW> callback)
    {
        string path = "file://" + this.m_assetPath + "/" + name;
        Debug.Log("加载：" + path);
        StartCoroutine(LoaderRes(path, callback));
    }
 
    IEnumerator LoaderRes(string path, Action<WWW> callback)
    {
        WWW www = new WWW(path);
        yield return www;
        if (www.isDone)
        {
            callback(www);
        }
    }
    #endregion
 
    #region Util
    /// <summary>
    /// 平台对应文件夹
    /// </summary>
    /// <returns></returns>
    private string GetRuntimePlatform()
    {
        string platform = "";
        if (Application.platform == RuntimePlatform.WindowsPlayer || Application.platform == RuntimePlatform.WindowsEditor)
        {
            platform = "Windows";
        }
        else if (Application.platform == RuntimePlatform.Android)
        {
            platform = "Android";
        }
        else if (Application.platform == RuntimePlatform.IPhonePlayer)
        {
            platform = "IOS";
        }
        else if (Application.platform == RuntimePlatform.OSXPlayer || Application.platform == RuntimePlatform.OSXEditor)
        {
            platform = "OSX";
        }
        return platform;
    }
}
#endregion

测试一下咯

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
 
public class TestAssetBundleLoader : MonoBehaviour
{
    Dictionary<string, GameObject> GameObjectPool = new Dictionary<string, GameObject>();
 
    void Start()
    {
        //要加载的资源的队列
        Queue<string> needLoadQueue = new Queue<string>();
        needLoadQueue.Enqueue("ui/plane");
        needLoadQueue.Enqueue("ui/cube");
        needLoadQueue.Enqueue("ui/sphere");
 
        Load(needLoadQueue);
    }
 
    void Load(Queue<string> needLoadQueue)
    {
        if (needLoadQueue.Count > 0)
        {
            string needLoadAssetName = needLoadQueue.Dequeue();
            AssetBundleLoaderMgr.Instance.LoadAssetBundle(needLoadAssetName, (obj) =>
            {
                GameObject go = GameObject.Instantiate(obj) as GameObject;
                int index = needLoadAssetName.LastIndexOf("/");
                string assetName = needLoadAssetName.Substring(index + 1);
 
                //加载出来的GameObject放到GameObjectPool存储
                GameObjectPool.Add(assetName, go);
 
                Load(needLoadQueue);
            });
        }
        else
        {
            Debug.Log("all finished");
        }
    }
}

有图有真相

可能代码写的还有很多优化的地方 ,毕竟100个人有100种写法，思路才是最重要的。你说呢？
其实我想说的是，代码都在了，自己尝试一下吧！

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原文地址：https://www.cnblogs.com/joeshifu/p/5488778.html