[小明爬坑系列]AssetBundle实战

一.创建assetbundle文件

　将asset数据进行AssetBundle的代码如下:

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEditor;

public class AssetBundle : Editor
{
    //将选中目录下以及子目录下的所有的asset文件打包
    [MenuItem("GameObject/Build AssetBundles From Directory of AssetFiles")]
    private static void ExportAssetBundles()
    {
        //选中的目录
        string path = AssetDatabase.GetAssetPath(Selection.activeObject);
        //选中目录中的子文件夹
        var childPaths = new Stack<string>();
        childPaths.Push(path);
        //待打包链表
        var waitForBundleList = new List<Object>();

        while (childPaths.Count != 0)
        {
            var curPath = childPaths.Pop();
            curPath = curPath.Replace("\", "/");
            //1.获得所有当前目录下的子目录和子文件
            var fileEntries = Directory.GetFiles(curPath);
            var pathEntries = Directory.GetDirectories(curPath);
            //2.子目录加入到stack中
            foreach (var pathEntry in pathEntries)
            {
                childPaths.Push(pathEntry);
            }
            //3.子文件,是asset的加入到待打包的链表中
            foreach (var fileEntry in fileEntries)
            {
                //先加载
                var t = AssetDatabase.LoadMainAssetAtPath(fileEntry);
                if (t != null)
                {
                    waitForBundleList.Add(t);
                }
            }
        }

        //打包
        if (BuildPipeline.BuildAssetBundle(waitForBundleList[0], waitForBundleList.ToArray(),
            Application.streamingAssetsPath + "/" + "name.assetbundle", BuildAssetBundleOptions.CollectDependencies,
            BuildTarget.Android))
        {
            AssetDatabase.Refresh();
        }
    }
}

　创建时,Projection面板下选择了所定义的Asset数据的文件夹,将文件夹中所包含的所有子文件以及Asset都打包到了StreamingAssets的name.assetbundle文件中.

二.读取assetbundle文件

　　存储的是技能asset数据,读取代码如下:

　　

 public static readonly string PathURL =
#if UNITY_ANDROID
 "jar:file://" + Application.dataPath + "!/assets/";
#elif UNITY_IPHONE
        Application.dataPath + "/Raw/";
#elif UNITY_ANDROID||UNITY_STANDALONE_WIN || UNITY_EDITOR
            "file://" + Application.dataPath + "/StreamingAssets/";
#else
        string.Empty;
#endif
        private void Start()
        {
            //初始化所有技能
            StartCoroutine(InitAllSkill());
            //初始化玩家技能
            InitPlayerSkill();
        }

        /// <summary>
        /// 根据序列化初始化当前的所有技能
        /// </summary>
        private IEnumerator InitAllSkill()
        {
            WWW bundle = null;

            bundle = new WWW(PathURL + "name.unity3D");
            MessageUiManger.Instance.Print("Path:" + PathURL + "name.unity3D");
            MessageUiManger.Instance.Print("Bundle.error:" + bundle.error);
            MessageUiManger.Instance.Print("bundle.assetBundle" + bundle.assetBundle);
            yield return bundle;

            try
            {
                var player = GameObject.FindGameObjectWithTag(Tags.Player);
                var skill = bundle.assetBundle.LoadAll(typeof (Skill));
                foreach (var o in skill)
                {
                    var s = o as Skill;
                    MessageUiManger.Instance.Print(s.ToString());
                    PlayerSkills.Add(s.Id, s);
                    s.Init(player);
                }
            }
            catch (Exception e)
            {
                MessageUiManger.Instance.Print(e.Message);
            }
        }

　　不同的平台需要不同的读取路径,通过c#的宏定义,将在目标平台变更时,编译不同的代码而改变读取路径.而用来指定编译宏定义的几个名称应该是写到了一些特殊文件里,但我还不知道写在了哪里.

　　在读取了Asset文件时,其中的关联关系不会改变,虽然不知道是如何实现的,但是用起来很方便.