[游戏开发]ab包（assetbundle）加载-资源打包和场景打包

?入口业务

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

public class AbManager : MonoBehaviour
{
    private void Awake()
    {
        DontDestroyOnLoad(gameObject);
    }
    void Start()
    {
        List<string> assets_bundle_keys = new List<string>();
        if (assets_bundle_keys != null)
        {
            //填写需要加载的包
            assets_bundle_keys.Add("prefabs");
            assets_bundle_keys.Add("scenes");
        }
        AssetPack.instance.loadAssetBundle(assets_bundle_keys, onLoadedScenes);
    }

    void onLoadedScenes()
    {
        SceneManager.sceneLoaded += OnSceneLoaded;
        //包加载完后跳转场景
        SceneManager.LoadScene("threeD");
    }

    public void OnSceneLoaded(Scene scene, LoadSceneMode _mode)
    {
        
        SceneManager.sceneLoaded -= OnSceneLoaded;
        AssetPack.instance.unLoadAssetBundle("threeD");
        //这里可以为场景中添加UI资源
    }

}

（ab包加载工具类）

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.UI;
using UnityEngine.Networking;

public class AssetPack : MonoBehaviour
{
    public static AssetPack instance;
    protected Dictionary<string, object> m_bundles = new Dictionary<string, object>();
    string _uri = Application.streamingAssetsPath;
    public Text loadingText;
    public Text progressText;
    public int   prograss;


    private void Awake()
    {
        instance = this;
    }


    //加载指定的ab包
    public void loadAssetBundle(List<string> _keys, UnityAction ua)
    {
        StartCoroutine(loadAb(_keys, ua));
    }
    //卸载指定的ab包
    public void unLoadAssetBundle(string abName)
    {
        if (m_bundles.ContainsKey(abName))
        {
            AssetBundle ab = m_bundles[abName] as AssetBundle;
            if (ab != null)
            {
                ab.Unload(false);
            }
            m_bundles.Remove(abName);
            return;
        }
    }

    IEnumerator loadAb(List<string> _keys, UnityAction ua)
    {
        foreach (var it in _keys)
        {
            print(_uri);
            UnityWebRequest request = UnityWebRequestAssetBundle.GetAssetBundle(_uri + "/" + it);
            //request.Send();
            request.SendWebRequest();
            while (!request.isDone)
            {
                loadingText.text = "正在加载\"" + it + "\"资源包";
                prograss = (int)(request.downloadProgress * 100);
                progressText.text = prograss + "";
                yield return 1;
            }
            if (request.isDone)
            {
                prograss = (int)(request.downloadProgress * 100);
                loadingText.text = "加载完成\"" + it + "\"资源包";
                progressText.text = prograss + "";
                AssetBundle ab = (request.downloadHandler as DownloadHandlerAssetBundle).assetBundle;
                m_bundles.Add(it, ab);
            }
          
        }
        if (ua != null)
        {
            ua.Invoke();
        }

    }


    //加载ab包中某个资源到对应的场景
    public GameObject loadAssetToScene(string abName,string assetName)
    {
        GameObject obj=null;
        if (m_bundles.ContainsKey(abName))
        {
            AssetBundle ab = m_bundles[abName] as AssetBundle;
            if (ab != null)
            {

                 obj = Instantiate(ab.LoadAsset<GameObject>(assetName));
            }
        }
        return obj;
    }

   
}

?第二个场景中实例化一些资源

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

public class threeD : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        AssetPack.instance.loadAssetToScene("prefabs", "fenshan"); 
    }

    // Update is called once per frame
    void Update()
    {
        
    }
}

准备两个场景

入口场景

?下面是跳转的场景

最后打包后运行如下：

?备注：上面风扇? 发布webgl后 在浏览器上浏览是正常的

打ab包可以用unity自带的AssetBundleBrowser

首次用AssetBundleBrowser，需要在包管理器添加

FR：徐海涛（hunk Xu）
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