Ios 可以获取AssetCollectionSwithType'；s在获取智能相册时是否对结果进行排序？

调用fetchAssetCollectionsWithType时，对于大多数集合类型，获得正确排序的结果并没有问题。例如：

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

我将所有相册正确排序，如果我颠倒排序顺序，我将得到相反的结果

当我对PhaseSetCollectionTypeSmartAlbum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];

结果不会以特定的顺序返回，尽管每次都是相同的顺序。颠倒顺序或将排序描述符更改为“endDate”之类的内容对结果没有影响。我已经证实，这些物品实际上具有如下性质：

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

这将生成如下日志： 本地化标题-视频，估计数量-0 本地化标题-全景，估计数量-0 localizedTitle-时间推移，估计数-0 本地化标题-Slo mo，估计数量-0 localizedTitle-突发，估计数-0 localizedTitle-收藏夹，估计数-0 本地化标题-所有照片，估计数量-0 localizedTitle-隐藏，估计数-0 localizedTitle-最近添加，估计数-0

有人把它正确分类了吗

我最终基本上把结果拉到一个数组中并对它们进行排序。我只是碰巧先要相机卷和收藏夹

    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];
    }

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有同样的问题，我一直在寻找有效的解决方案几个小时没有运气！你看，我在上面回答了自己，这真的是我找到的最好的解决办法。