【Unity】AssetBundle加载与卸载

unity官方apiAssetBundle-LoadFromFileAsync - Unity 脚本 API

异步加载AB包

using UnityEngine;
using System.Collections;
using System.IO;public class LoadFromFileAsyncExample : MonoBehaviour
{IEnumerator Start(){var bundleLoadRequest = AssetBundle.LoadFromFileAsync(Path.Combine(Application.streamingAssetsPath, "myassetBundle"));yield return bundleLoadRequest;var myLoadedAssetBundle = bundleLoadRequest.assetBundle;if (myLoadedAssetBundle == null){Debug.Log("Failed to load AssetBundle!");yield break;}var assetLoadRequest = myLoadedAssetBundle.LoadAssetAsync<GameObject>("MyObject");yield return assetLoadRequest;GameObject prefab = assetLoadRequest.asset as GameObject;Instantiate(prefab);myLoadedAssetBundle.Unload(false);}
}

需要注意的是同一个ab包一次只能加载一个，不可以同时加载，

报错：The AssetBundle 'xxxxx' can't be loaded because another AssetBundle with the same files is already loaded.

如果AB包已经加载过则先进行卸载：

if (myLoadedAssetBundle != null){myLoadedAssetBundle.Unload(false);//关键代码}

卸载AB包

1、卸载全部的目前没有使用的资源： Resources.UnloadUnusedAssets()

2、卸载 AssetBundle 释放其数据： AssetBundle.Unload(true/false);

3、卸载当前已加载的所有 AssetBundle： AssetBundle.UnloadAllAssetBundles(true/false)

当为 false 时，将释放当前加载的捆绑包中的压缩文件数据，但已从捆绑包中加载的任何对象实例将保持不变。
UnloadAllAssetBundles不会中断异步加载过程，如果已经在进行异步加载了此时调用AssetBundle.UnloadAllAssetBundles，那么这个AB包还是会加载出来。

using UnityEngine;public class AssetBundleManager : MonoBehaviour
{public void LoadAssetBundle(string bundleName){AssetBundle bundle = AssetBundle.LoadFromFile(bundleName);if (bundle != null){// 假设你有一个你想要加载的资源的名字string assetName = "myAsset";UnityEngine.Object asset = bundle.LoadAsset(assetName);// 使用 asset ...// 卸载AssetBundlebundle.Unload(false);// 如果确定没有其他引用，可以进一步释放内存Resources.UnloadUnusedAssets();System.GC.Collect();}}
}