ModelProject/Assets/Scripts/SceneAssetRequest.cs

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

public class SceneAssetRequest : AssetRequest
{
    protected readonly string sceneName;
    public string assetBundleName;
    protected BundleRequest BundleRequest;
    protected List<BundleRequest> children = new List<BundleRequest>();

    public SceneAssetRequest(string path, bool addictive)
    {
        name = path;
        LoadModule.GetAssetBundleName(path, out assetBundleName);
        sceneName = Path.GetFileNameWithoutExtension(name);
        loadSceneMode = addictive ? LoadSceneMode.Additive : LoadSceneMode.Single;
    }

    public LoadSceneMode loadSceneMode { get; protected set; }

    public override float progress
    {
        get { return 1; }
    }

    internal override void Load()
    {
        if (!string.IsNullOrEmpty(assetBundleName))
        {
            BundleRequest = LoadModule.LoadBundle(assetBundleName);
            if (BundleRequest != null)
            {
                var bundles = LoadModule.GetAllDependencies(assetBundleName);
                foreach (var item in bundles) children.Add(LoadModule.LoadBundle(item));
                SceneManager.LoadScene(sceneName, loadSceneMode);
            }
        }
        else
        {
            SceneManager.LoadScene(sceneName, loadSceneMode);
        }

        LoadState = AssetLoadState.Loaded;
    }

    internal override void Unload()
    {
        if (BundleRequest != null)
            BundleRequest.Release();

        if (children.Count > 0)
        {
            foreach (var item in children) item.Release();
            children.Clear();
        }

        if (loadSceneMode == LoadSceneMode.Additive)
            if (SceneManager.GetSceneByName(sceneName).isLoaded)
                SceneManager.UnloadSceneAsync(sceneName);

        BundleRequest = null;
        LoadState = AssetLoadState.Unload;
    }
}