Unity中加载AB包(本地加载)

下载AssetBundles插件

1. 下载地址：https://gitee.com/icejacool/AssetBundles-Browser
2. 下载成功之后，解压文件。解压之后的文件拖入Unity的Asset文件夹下面。
3. 应该会有报错，删除AssetBundles-Browser-master文件夹下面的Tests文件夹

配置资源(场景)

1.选中想要打成AB包的场景，在右下角AssetBundle的位置新建标签，以test为例

2.点击Window->AssetBundleBrowser打开打包AB包的界面，刷新界面，显示所有的AB包，确保显示的是你想要打包的场景

3.点击Build页签，设置打包相关信息

1. 选择目标平台，我选的是Android
2. 勾选ClearFolders,每次打包的时候删除之前打包的AB包，无缓存重新打包
3. 选择Compression(压缩方式)：
   1. NoCompression:无压缩，加载速度最快，包体最大
   2. LZMA:压缩最狠，加载速度最慢，解压需要占的内存也最多，包体最小
   3. LZ4:微压缩，加载速度较快，包体占三种里的中等(我是本地加载，包体压缩不是最重要，所以选了这个)

4.打包完成之后在Assets的同级文件夹会出现AssetBundles文件夹，里面是对应平台的AB包

加载AB包

获取加载地址

//获取加载AB包的地址 private string GetBundlePath(string sceneName) { string path; #if UNITY_EDITOR path = Application.dataPath.Replace("/Assets", "") + "/AssetBundles/Android/"; #else path =Application.persistentDataPath + "/"; #endif switch (sceneName) { //根据场景名字加载不同的AB包 case "env_04": path = path + "test"; break; } return path; }

异步加载AB包

先定义一个AssetBudle,再进行加载赋值

private AssetBundle assetBundle; private IEnumerator LoadAssetBundleAsync(string sceneName, Action<AssetBundle> callback,int index=1) { Debug.LogError("开始加载ab包...." + sceneName); string bundlePath = GetBundlePath(sceneName); AssetBundleCreateRequest request = AssetBundle.LoadFromFileAsync(bundlePath); while (!request.isDone) { //Debug.LogError("AB加载中，进度为：" + request.progress); //这里可以放进度条之类的提示 yield return null; } assetBundle = request.assetBundle; if (assetBundle != null) { // 缓存AB包 callback?.Invoke(assetBundle); } else { Debug.LogError($"无法加载AB包: {bundlePath}"); callback?.Invoke(null); } }

加载附加场景

我的项目中设定的是Loading场景一直存在，其他场景叠加显示，所以流程是先卸载当前场景，再加载AB包，最后再加载场景

private IEnumerator LoadNextSceneCoroutine(string _sceneName, Action _loadCompleteEvent = null, Action _completeEveent = null) { //这块是显示UI进度条 yield return StartCoroutine(ShowLoadingUI()); #region 卸载场景 Scene currentScene = SceneManager.GetActiveScene(); AsyncOperation unloadOp = SceneManager.UnloadSceneAsync(currentScene); Debug.LogError("开始卸载"); while (!unloadOp.isDone) { Debug.LogError("卸载中......"); yield return null; } #endregion // 执行GC AssetBundle.UnloadAllAssetBundles(true); yield return Resources.UnloadUnusedAssets(); GC.Collect(); Debug.LogError("卸载成功"); LoadScene(_sceneName, _loadCompleteEvent, _completeEveent); } /// <summary> /// 加载场景 /// </summary> /// <param name="_sceneName">场景名字</param> /// <param name="_loadCompleteEvent">加载完成后的事件</param> /// <param name="_completeEveent"></param> public void LoadScene(string _sceneName,Action _loadCompleteEvent=null,Action _completeEveent=null) { StartCoroutine(LoadSceneCoroutine(_sceneName, _loadCompleteEvent, _completeEveent)); } private IEnumerator LoadSceneCoroutine(string _sceneName, Action _loadCompleteEvent = null, Action _completeEveent = null) { Debug.LogError("开始加载...."+ _sceneName); if (assetBundle != null) { assetBundle.Unload(true); assetBundle = null; GC.Collect(); } string scene = _sceneName; yield return StartCoroutine(LoadAssetBundleAsync(_sceneName, (loadedBundle) => { assetBundle = loadedBundle; })); if (assetBundle != null) { scene = assetBundle.GetAllScenePaths()[0]; } //加载场景 AsyncOperation op = SceneManager.LoadSceneAsync(scene, LoadSceneMode.Additive); while (!op.isDone) { // 实际加载进度（0-0.9） actualProgress = op.progress; yield return null; } Scene newScene = SceneManager.GetSceneByName(_sceneName); if (newScene.IsValid()) { //Debug.LogError("设置新的激活场景"); SceneManager.SetActiveScene(newScene); } yield return Resources.UnloadUnusedAssets(); GC.Collect(); if (_loadCompleteEvent != null) { _loadCompleteEvent(); } yield return new WaitForSecondsRealtime(1); if (_completeEveent != null) { _completeEveent(); } yield break; }