Preview and Review Materials

https://shenjun-coder.github.io/LuaBook/

AB bag

1. Introduction:

Definition of AssetBundle: It is a file that saves resource files together in a tight way. The AB package is a resource storage file independent of the main game package. It needs to be downloaded and loaded separately when used.

The difference between ab package and Resource:

In terms of storage: the internal resources of Resource are stored in the release package of the game, while the ab package is stored in a separate folder outside the main game package

In terms of loading: Resource can be loaded directly using Resource.Load()

AB package: the first step: first obtain the ab package file (download, decompress and copy to a writable directory)

Step 2: Load the file by file name or file path

Introduction of AB package and implementation of export tool

Export the ab package code:

using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;
using System.IO;

public class ExportAB {
    [MenuItem("AB包/导出")]
    public static void Export()
    {
        //项目的assets目录
        string path = Application.dataPath;
        Debug.Log(path);
        //Debug.LogError(path);
        path = path.Substring(0, path.Length - 6)+"ab";

        //防止路径不存在
        if (!Directory.Exists(path))
        {
            Directory.CreateDirectory(path);
        }

        //导出AB包的核心代码，生成ab包文件
        //参数一：导出ab包文件的存储路径
        //参数二：导出选项
        //参数三：导出到哪个平台
        BuildPipeline.BuildAssetBundles(path, BuildAssetBundleOptions.None, BuildTarget.StandaloneWindows);

        Debug.Log("AB包导出成功");

    }

}

Simple loading of AB package resources

 void Start()
    {
        //第一步：加载ab包文件
        AssetBundle ab =AssetBundle.LoadFromFile(config.abPathConfig + "ab/ui");
        
        //第二步：根据文件名加载文件
        Sprite sp = ab.LoadAsset<Sprite>("Tex_bone_01");
        
        img.sprite = sp;
        ab.Unload(false);
    }

ab package dependency loading: (load internal resources of ab package containing dependencies)

Relevant code:

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

public class Load : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        //加载包含依赖的ab包内部资源
        //第一步：加载主AB包文件
        AssetBundle abmain = AssetBundle.LoadFromFile(config.abPathConfig + "/ab/ab");
        //第二步：加载主AB包文件的配置文件
        AssetBundleManifest bundleManifest = abmain.LoadAsset<AssetBundleManifest>("AssetBundleManifest");
        //第三步：分析要加载的预制体所在的AB包，依赖哪些ab包
        string[] deps = bundleManifest.GetAllDependencies("test");
        //第四步：加载依赖的ab包文件
        for (int i = 0; i < deps.Length; i++)
        {
            AssetBundle.LoadFromFile(config.abPathConfig + "ab/" + deps[i]);

        }
        //第五步：加载预制体所在的ab包文件
        AssetBundle testAB = AssetBundle.LoadFromFile(config.abPathConfig + "ab/test");
        //第六步：加载预制体
        Object obj = testAB.LoadAsset("Tex_cloth_07_b");
        GameObject gobj = Instantiate(obj) as GameObject;
        gobj.transform.SetParent(GameObject.Find("/Canvas").transform);
        gobj.transform.localPosition = Vector3.zero;
        gobj.transform.localScale= Vector3.one;

    }

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

    }
}

Asynchronous loading: (implemented using coroutines, but essentially true asynchronous)

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

public class HotUpdate : MonoBehaviour
{
    public Image img;

    void Start()
    {
        StartCoroutine(LoadABAsync());
        
    }

    //异步加载
    IEnumerator LoadABAsync()
    {
        //异步加载
        //第一步：加载ab包
        AssetBundleCreateRequest ab = AssetBundle.LoadFromFileAsync(config.abPathConfig + "ab/ui");

        yield return ab;
        //异步加载文件
        img.sprite = ab.assetBundle.LoadAsset<Sprite>("Tex_bone_01");
    }

}

memory analysis

Uninstallation of ab package files

//参数表示，是否将场景中的通过AB包加载出来的资源，同AB包一起销毁
ab.Unload(false)

//将所有没有再使用的资源进行回收
Resource.UnloadUnusedAssets();

Export and load of AB package