0. 基础

0.1 不同加载模式 测试用

编辑器模式；打包模式；更新模式

public enum GameMode
{
    EditorMode,
    PackageBundle,
    UpdateMode,
}

0.2 加载资源步骤与接口

    
private void LoadAsset(string assetName, Action<Object> action)
{
    if (AppConst.GameMode == GameMode.EditorMode)
    {
#if UNITY_EDITOR
        EditorLoadAsset(assetName, action);
#else
        Debug.LogError("Editor mode is not supported in the built version.");
#endif
    }
    else
    {
        StartCoroutine(LoadBundleAsync(assetName, action));
    }
}

0.3 解析版本文件

/// <summary>
/// 解析版本文件
/// </summary>
public void ParseVersionFile()
{
    //版本文件路径
    string url = Path.Combine(PathUtil.BundleResourcePath, AppConst.FileListName);
    string[] data = File.ReadAllLines(url);

    //解析文件信息
    for (int i = 0; i < data.Length; i++)
    {
        string[] info = data[i].Split('|');

        BundleInfo bundleinfo = new BundleInfo()
        {
            AssetsName = info[0],
            BundleName = info[1]
        };

        //list特性：本质是数组但可动态扩容
        bundleinfo.Dependences = new List<string>(info.Length - 2);
        for (int j = 2; j < info.Length; j++)
        {
            bundleinfo.Dependences.Add(info[j]);
        }
        m_BundleInfos.Add(bundleinfo.AssetsName, bundleinfo);
    }
}

1. 打包模式加载资源

递归异步加载资源：
根据资源的依赖关系递归加载所有需要的资源包，并最终加载目标资源，加载完成后调用回调函数处理加载资源。

/// <summary>
/// 递归异步加载资源
/// </summary>
/// <param name="assetName"></param>
/// <param name="action"></param>
/// <returns></returns>
IEnumerator LoadBundleAsync(string assetName, Action<Object> action = null)
{
    string bundleName = m_BundleInfos[assetName].BundleName;
    string bundlePath = Path.Combine(PathUtil.BundleResourcePath, bundleName);
    List<string> dependences = m_BundleInfos[assetName].Dependences;
    if (dependences != null && dependences.Count > 0)
    {
        for (int i = 0; i < dependences.Count; i++)
        {
            yield return LoadBundleAsync(dependences[i]);
        }
    }

    AssetBundleCreateRequest request = AssetBundle.LoadFromFileAsync(bundlePath);
    yield return request;

    AssetBundleRequest bundleRequest = request.assetBundle.LoadAssetAsync(assetName);
    yield return bundleRequest;

    //Log
    Debug.LogFormat("Package Bundle Mode Load Resource : {0}", assetName);

    action?.Invoke(bundleRequest?.asset);
}

2. 编辑器模式加载资源

/// <summary>
/// 编辑器模式加载资源
/// </summary>
/// <param name="assetName"></param>
/// <param name="actioin"></param>
#if UNITY_EDITOR
void EditorLoadAsset(string assetName, Action<Object> actioin = null)
{
    //Log
    Debug.LogFormat("Editor Mode Load Resource : {0}", assetName);

    Object obj = UnityEditor.AssetDatabase.LoadAssetAtPath(assetName, typeof(Object));
    if (obj == null)
        Debug.LogError("Asset name is not exist" + assetName);

    actioin?.Invoke(obj);
}
#endif

3. 更新模式加载资源

详见3 热更新