第二步：加载AB包的资源，用于显示

using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;
using UnityEngine.Networking;
using UnityEngine.U2D;
using UnityEngine.UI;

public class GameLaunch : MonoBehaviour
{
    public Button Btn;
    public Button Btn2;
    private string bundlePath = "";
    private string bundlePath2 = "";
    public Transform Parent_;
    public Image IMG;
    void Start()
    {
        bundlePath =Path.Combine(Application.streamingAssetsPath + "/AB/","prefab_ui") ;
        bundlePath2 =Path.Combine(Application.streamingAssetsPath + "/AB/","prefab_altlas") ;
        Btn.onClick.AddListener(() =>
        {
            //加载资源
            // 同时启动两个异步加载过程
            StartCoroutine(LoadAssetBundlesAsync());
        });
        Btn2.onClick.AddListener(() =>
        {
            StartCoroutine(LoadAssetBundlesAsync2());
        });
    }
    IEnumerator LoadAssetBundlesAsync()
    {
        // 同时启动两个异步加载过程
        yield return StartCoroutine(LoadAssetBundleAsync(bundlePath2, "_图集_AB", "Atlas_One","ui_frame_fight"));
    }
    IEnumerator LoadAssetBundlesAsync2()
    {
        // 同时启动两个异步加载过程
        yield return StartCoroutine(LoadAssetBundleAsync(bundlePath, "_UI_AB", "Prefab_One"));
    }
    IEnumerator LoadAssetBundleAsync(string path, string debugMessage, string assetName, string spriteName = null)
    {
        AssetBundleCreateRequest request = AssetBundle.LoadFromFileAsync(path);
        // 等待加载完成
        yield return request;

        var myLoadedAssetBundle = request.assetBundle;
        if (myLoadedAssetBundle == null)
        {
            Debug.LogError("Failed to load AssetBundle: " + debugMessage);
        }
        else
        {
            Debug.Log(debugMessage + "加载完成");
            if (debugMessage == "_UI_AB")
            {
                if (!string.IsNullOrEmpty(assetName))
                {
                    GameObject prefab = myLoadedAssetBundle.LoadAsset<GameObject>(assetName);
                    GameObject Clone = Instantiate(prefab); //prefab中有Imgs图片.sprite 在spriteAtlas里面，编辑器加载的图片是正确的，但是APK加载的Imgs图片.sprite = spriteAtlas图集
                    Clone.transform.SetParent(Parent_);
                    Clone.transform.localPosition = Vector3.zero;
                }
            }
            else if (debugMessage == "_图集_AB")
            {
                //用于检测该AB包中拥有的所有资源，如Atlas_One
                object[] allAssets = myLoadedAssetBundle.LoadAllAssets();
                foreach (var asset in allAssets)
                {
                    Debug.Log("Asset in bundle: " + asset);
                }
                
                if (!string.IsNullOrEmpty(assetName))
                {
                    // 从 SpriteAtlas 中获取 Sprite
                    SpriteAtlas spriteAtlas = myLoadedAssetBundle.LoadAsset<SpriteAtlas>(assetName);
                    // 获取 SpriteAtlas 中的所有 Sprite
                    // Sprite[] sprites = new Sprite[spriteAtlas.spriteCount];
                    // spriteAtlas.GetSprites(sprites);
                    Sprite Sp = spriteAtlas.GetSprite(spriteName);//编辑器与APK加载的话，图片显示全都没问题
                    IMG.sprite = Sp;
                }
            }

        }
    }
}

运行，点击Btn1 ，可以加载图片ui_frame_fight

点击Btn2,可以创建预制体Prefab_One

一如既往，还有疑问，就直接在评论区问，我会尽快回复的