管理类中继承的单例框架见上篇https://blog.csdn.net/YuKar_/article/details/133135713?spm=1001.2014.3001.5501

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class ABManager : Singleton<ABManager>
{
    //主包
    private AssetBundle ab_main = null;
    //获取依赖包所需的配置文件
    private AssetBundleManifest manifest = null;
    //记录ab包的字典
    private Dictionary<string, AssetBundle> abDir = new Dictionary<string, AssetBundle>();

    //AB包默认路径
    private string pathURL
    {
        get
        {
            //资源路径
            return @"D:\Unity Projects\ABManager\AssetBundles\PC\";
        }
    }
    //AB包目录名字
    private string abDefaultName
    {
        get
        {
            return "PC";
        }
    }

    //获取ab包资源
    private void LoadAB(string abName)
    {
        if (ab_main == null)
        {
            //加载主包
            ab_main = AssetBundle.LoadFromFile(pathURL + abDefaultName);
            manifest = ab_main.LoadAsset<AssetBundleManifest>("AssetBundleManifest");
            //获取依赖包相关信息
            AssetBundle ab;
            string[] str = manifest.GetAllDependencies(abName);
            for (int i = 0; i < str.Length; i++)
            {
                if (!abDir.ContainsKey(str[i]))
                {
                    ab = AssetBundle.LoadFromFile(pathURL + str[i]);
                    abDir.Add(str[i],ab);
                }
            }
            //加载资源来源包
            if (!abDir.ContainsKey(abName))
            {
                ab = AssetBundle.LoadFromFile(pathURL + abName);
                abDir.Add(abName, ab);
            }

        }
    }

    //同步加载
    public Object LoadRes(string abName,string resName)
    {
        LoadAB(abName);

        return abDir[abName].LoadAsset(resName);
    }

    //同步加载(指定类型)
    public Object LoadRes(string abName,string resName ,System.Type type)
    {
        LoadAB(abName);

        return abDir[abName].LoadAsset(resName , type);
    }
    
    //异步加载
    public void LoadResAsync(string abName,string resName)
    {
        StartCoroutine(ReallyLoadResAsync(abName, resName));
    }
    private IEnumerator ReallyLoadResAsync(string abName,string resName)
    {
        LoadAB(abName);
        AssetBundleRequest abr = abDir[abName].LoadAssetAsync(resName);

        yield return abr;

        if(abr.asset != null)
        {
            Debug.Log("加载成功");
            Instantiate(abr.asset);
        }
        else
        {
            Debug.LogWarning("资源加载失败");
        }
    }
    //单个包卸载
    public void UnLoad(string abName)
    {
        if (abDir.ContainsKey(abName))
        {
            abDir[abName].Unload(false);
            abDir.Remove(abName);
        }
    }
    //全部包卸载
    public void ClearAB()
    {
        AssetBundle.UnloadAllAssetBundles(false);
        abDir.Clear();
        ab_main = null;
        manifest = null;
    }
}

测试代码

其中第一个参数为AB包名字，第二个参数为AB包中对应的资源名字，这里获取并实例化"model"包中的"cube"物体。

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class ABTest : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        //同步加载
        Object obj = ABManager.Instance.LoadRes("model", "cube");
        Instantiate(obj);
        //同步加载(指定类型)
        //obj = ABManager.Instance.LoadRes("model", "cube", typeof(GameObject));
        //Instantiate(obj);
        //异步加载
        //ABManager.Instance.LoadResAsync("model", "cube");
    }
}

执行对应方法后即可生成对应资源文件。