Unity AssetBundles 通过 AppStoreConnect SIGABRT

Question

我正在尝试使用 AssetBundle 构建一个 Unity 游戏，我想使用 Apple AppStore 分发它们。 但是，当我尝试使用资产包时，该应用程序会因 SIGABRT 错误而崩溃。

我遵循了此说明并对其进行了调整以满足我们的需求。 加载request.error时返回一个空字符串（不是预期的 null）。

尽管myLoadedAssetBundle.GetAllAssetNames()会按预期返回完整的资产列表。

资产包显示在 XCode 中（见下图）。

将存档上传到 AppStoreConnect On-Demand-Resources 后标记为“是”，但与文档相反，未显示资产数量。

• Mac Studio M1 至尊
• MacOS 13.0.1 (22A400)
• Unity 2020.3.39f（英特尔）
• XCode 版本 14.1 (14B47b)
• Visual Studio for Mac 17.4.1（内部版本 28）
• iPad（10代）
• iPadOS 16.1.1 (20B101)

---

创建资产包：

public class CreateAssetBundles
{
    static string iosAssetBundleDirectory = "AssetBundles/iOS";
    [InitializeOnLoadMethod]
    static void SetupResourcesBuild()
    {
        UnityEditor.iOS.BuildPipeline.collectResources += CollectResources;
    }

    static UnityEditor.iOS.Resource[] CollectResources()
    {
        var bundles = AssetDatabase.GetAllAssetBundleNames ();
        
        var reslist = new List<UnityEditor.iOS.Resource> ();
        foreach (var b in bundles)
        {
            reslist.Add(new UnityEditor.iOS.Resource(b,Path.Combine(iosAssetBundleDirectory, b)).AddOnDemandResourceTags(b));
        }

        return reslist.ToArray();
    }

    [MenuItem ("Assets/Build AssetBundles/iOS")]
    static void BuildiOS ()
    {
        EnableDisableAtlas (true);
        
        var options = BuildAssetBundleOptions.None;

        bool shouldCheckODR = EditorUserBuildSettings.activeBuildTarget == BuildTarget.iOS;

#if UNITY_TVOS
        shouldCheckODR |= EditorUserBuildSettings.activeBuildTarget == BuildTarget.tvOS;
#endif

        if (shouldCheckODR)
        {
#if IOS_APP_BUNDLE
            if (PlayerSettings.iOS.useOnDemandResources)
            {
                options |= BuildAssetBundleOptions.UncompressedAssetBundle;
            }
#endif

#if ENABLE_IOS_APP_SLICING
            options |= BuildAssetBundleOptions.UncompressedAssetBundle;
#endif

            if (!Directory.Exists(iosAssetBundleDirectory))
            {
                Directory.CreateDirectory(iosAssetBundleDirectory);
            }
        }
        var ret = BuildPipeline.BuildAssetBundles (iosAssetBundleDirectory,
                                        options,
                                        BuildTarget.iOS);
        EnableDisableAtlas (false);
    }
}

加载资产包

    public override IEnumerator DownloadAssetBundleAsync (string bundleName, StringParameter statusParameter, Image progressBar, float remainingPercentiles)
    {
        OnDemandResourcesRequest request = OnDemandResources.PreloadAsync(new string[] { bundleName });
        while (!request.isDone)
        {
            yield return null;
        }

        if (request.error != null && request.error != "")
        {
            //handle error
        }
        DownloadFinished?.Invoke(bundleName);
        yield break;

    }
   
    public override IEnumerator LoadAssetBundleFromFileAsync (string bundleName, StringParameter statusParameter, Image progressBar, float remainingPercentiles, bool checkOutdated)
    {
        var filepath = "res://" + bundleName;

        var bundleLoadRequest = AssetBundle.LoadFromFileAsync(filepath);
        yield return bundleLoadRequest;
        while (!bundleLoadRequest.isDone)
        {
            yield return null;
        }
        var myLoadedAssetBundle = bundleLoadRequest.assetBundle;

        if (myLoadedAssetBundle == null)
        {
            //Handle error
        }
        loadedAssetBundle = myLoadedAssetBundle;
    }

SIGABRT

Incident Identifier: [REMOVED]
Beta Identifier:     [REMOVED]
Hardware Model:      iPad13,18
Process:             [REMOVED] [547]
Path:                /private/var/containers/Bundle/Application/[REMOVED]
Identifier:          [REMOVED]
Version:             0.9.1 (21)
AppStoreTools:       14C17
AppVariant:          1:iPad13,18:16
Beta:                YES
Code Type:           ARM-64 (Native)
Role:                Foreground
Parent Process:      launchd [1]
Coalition:           [REMOVED] [694]

Date/Time:           2022-12-12 13:45:12.5058 +0100
Launch Time:         2022-12-12 13:45:05.0791 +0100
OS Version:          iPhone OS 16.1.1 (20B101)
Release Type:        User
Report Version:      104

Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Triggered by Thread:  35

Application Specific Information:
abort() called


Last Exception Backtrace:
0   CoreFoundation                         0x1d1171e88 __exceptionPreprocess + 164
1   libobjc.A.dylib                        0x1ca5178d8 objc_exception_throw + 60
2   Foundation                             0x1cb6259b0 -[_NSInlineData length] + 0
3   UnityFramework                         0x10fc45370 AssetCatalogFile::Read(unsigned long long, unsigned long long, void*, unsigned long long*, FileReadFlags) + 88806256 (AssetCatalogFileSystem.mm:52)
4   UnityFramework                         0x10fc45264 AssetCatalogFileSystemHandler::Read(FileEntryData&, VFS::FileSize, unsigned long long, void*, unsigned long long*, FileReadFlags) + 88805988 (AssetCatalogFileSystem.mm:178)
5   UnityFramework                         0x10f0c1074 FileAccessor::Read(VFS::FileSize, unsigned long long, void*, unsigned long long*, FileReadFlags) + 76730484 (VirtualFileSystem.cpp:1011)
6   UnityFramework                         0x10f6ad6c4 ArchiveStorageReader::ReadFromStorage(unsigned long long, unsigned long long, void*, unsigned long long*) + 82941636 (ArchiveStorageReader.cpp:587)
7   UnityFramework                         0x10f6a5f80 ArchiveStorageReader::Read(VFS::FileSize, unsigned long long, void*, unsigned long long*, FileReadFlags) + 82911104 (ArchiveStorageReader.cpp:173)
8   UnityFramework                         0x10f6a5d60 ArchiveReadFile::Read(VFS::FileSize, unsigned long long, void*, unsigned long long*, FileReadFlags) + 82910560 (ArchiveReadFile.cpp:42)
9   UnityFramework                         0x10f6a4240 ArchiveFileSystem::Read(FileEntryData&, VFS::FileSize, unsigned long long, void*, unsigned long long*, FileReadFlags) + 82903616 (ArchiveFileSystem.cpp:267)
10  UnityFramework                         0x10f0c1074 FileAccessor::Read(VFS::FileSize, unsigned long long, void*, unsigned long long*, FileReadFlags) + 76730484 (VirtualFileSystem.cpp:1011)
11  UnityFramework                         0x10f61714c File::Read(VFS::FileSize, void*, unsigned long, FileReadFlags) + 82325836 (FileVFS.cpp:443)
12  UnityFramework                         0x10f2b1ecc AsyncReadManagerThreaded::PumpRequests(dynamic_array<AsyncReadCommand*, 0ul>&, dynamic_array<AsyncReadCommand*, 0ul>&) + 78765772 (AsyncReadManagerThreaded.cpp:169)
13  UnityFramework                         0x10f2b191c AsyncReadManagerThreaded::ThreadEntry() + 78764316 (AsyncReadManagerThreaded.cpp:248)
14  UnityFramework                         0x10f2b12d0 AsyncReadManagerThreaded::StaticThreadEntry(void*) + 78762704 (AsyncReadManagerThreaded.cpp:118)
15  UnityFramework                         0x10f6c6994 Thread::RunThreadWrapper(void*) + 83044756 (Thread.cpp:81)
16  libsystem_pthread.dylib                0x21d84b6cc _pthread_start + 148
17  libsystem_pthread.dylib                0x21d84aba4 thread_start + 8

Answer 1

正如Unity-Forum 的 Feyyyyy 所指出的：在将下载和读取 AssetBundle 细分为不同功能时，一定要保留request 。

如果request超出 scope，则 AssetBundle 将被垃圾回收，并且 App 在尝试读取数据时崩溃。

例如，可以通过将请求推送到 static 列表来解决该问题

    private static List<OnDemandResourcesRequest> requestsList = new List<OnDemandResourcesRequest>();

    public override IEnumerator DownloadAssetBundleAsync (string bundleName, StringParameter statusParameter, Image progressBar, float remainingPercentiles)
    {
        OnDemandResourcesRequest request = OnDemandResources.PreloadAsync(new string[] { bundleName });
        while (!request.isDone)
        {
            yield return null;
        }

        if (request.error != null && request.error != "")
        {
            //handle error
        }
        requestsList.Add(request);      // Push into list to prevent GC
        DownloadFinished?.Invoke(bundleName);
        yield break;
    }