获取智能相册时可以对fetchAssetCollectionsWithType的结果进行排序吗？

Question

调用fetchAssetCollectionsWithType时，我可以轻松获取大多数集合类型的正确排序结果。例如：

fetchOptions = [[PHFetchOptions alloc] init];
fetchOptions.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"localizedTitle" ascending:YES],];
PHFetchResult *topLevelUserCollections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:fetchOptions];

我将所有专辑正确排序，如果我颠倒排序顺序，我会得到相反的结果。

当我对PHAssetCollectionTypeSmartAlbum执行相同操作时：

PHFetchOptions *fetchOptions = [[PHFetchOptions alloc] init];
fetchOptions.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"localizedTitle" ascending:YES],];
PHFetchResult *smartAlbums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeAny options:fetchOptions];

结果不按特定顺序返回，但每次都是相同的顺序。撤消订单或将排序描述符更改为“endDate”之类的其他内容对结果没有影响。我已经确认这些项目实际上具有以下属性：

for (PHAssetCollection *aSmartAlbum in smartAlbums){
    NSLog(@"localizedTitle - %@, estimatedCount - %u", aSmartAlbum.localizedTitle, (int)(aSmartAlbum.estimatedAssetCount == NSNotFound ? 0 : aSmartAlbum.estimatedAssetCount));
}

这会生成如下日志： localizedTitle - 视频，estimatedCount - 0 localizedTitle - Panoramas，estimatedCount - 0 localizedTitle - Time-lapse，estimatedCount - 0 localizedTitle - Slo-mo，estimatedCount - 0 localizedTitle - Bursts，estimatedCount - 0 localizedTitle - Favorites，estimatedCount - 0 localizedTitle - 所有照片，estimatedCount - 0 localizedTitle - 隐藏，estimatedCount - 0 localizedTitle - 最近添加，estimatedCount - 0

有没有人让它正确排序？

我最终基本上将结果拉入数组并对其进行排序。我碰巧首先想要相机胶卷和收藏夹。

    PHFetchOptions *fetchOptions = [PHFetchOptions new];
    PHFetchResult* unorderedSmart = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeAny options:fetchOptions];

    PHAssetCollection* allPhotos;
    PHAssetCollection* favorites;
    NSMutableArray* orderedSmart = [NSMutableArray array];
    for (PHAssetCollection *aSmartAlbum in unorderedSmart){
        if (aSmartAlbum.assetCollectionSubtype == PHAssetCollectionSubtypeSmartAlbumUserLibrary) {
            allPhotos = aSmartAlbum;
        }else if (aSmartAlbum.assetCollectionSubtype == PHAssetCollectionSubtypeSmartAlbumFavorites){
            favorites = aSmartAlbum;
        }else{
            [orderedSmart addObject:aSmartAlbum];
        }
    }

    [orderedSmart sortUsingComparator:^NSComparisonResult(id  _Nonnull obj1, id  _Nonnull obj2) {
        PHAssetCollection* ac1 = obj1;
        PHAssetCollection* ac2 = obj2;

        return [ac1.localizedTitle localizedCaseInsensitiveCompare:ac2.localizedTitle];
    }];

    if (favorites) {
        [orderedSmart insertObject:favorites atIndex:0];
    }
    if (allPhotos) {
        [orderedSmart insertObject:allPhotos atIndex:0];
    }