ios - PHPhotoLibrary 获取相册名称

Question

我一直在尝试寻找一种替代方法，以在 iOS 8 中使用 Photos API 获取相册名称。使用 ALAssets，我们可以使用:valueForProperty:ALAssetsGroupPropertyName 但是，使用 Photos API，我可以'似乎找到了替代方案。有: PHAssetCollection 下的 localizedTitle 但这也不对，它只是给了我城市名称。我正在寻找可以返回组的实际名称的东西，包括与 iTunes 同步的名称。

如果能帮助我了解您如何在您的应用中执行此操作，我将不胜感激。 Apple 鼓励我们仅将 Photos API 用于与 8.0 相关联的应用程序，因此我不想同时使用 ALAssetLibrary 和 Photos。

代码:

- (NSString *)nameForAlbumInCollection:(id)collection
{
    NSString *title = nil;

    if ([PHAsset class])
    {
        title = [collection localizedTitle];
    }
    else
    {
        title = [collection valueForProperty:ALAssetsGroupPropertyName];
    }

    return title;
}

- (void)setup
{
    self.recentsCollectionDataSource = [[NSMutableOrderedSet alloc]init];
    self.favoritesCollectionDataSource = [[NSMutableOrderedSet alloc]init];
    self.albumsTableDataSource = [[NSMutableOrderedSet alloc]init];

    NSMutableArray *segmentTitles = [[NSMutableArray alloc]init];

    self.assetsFetchResult = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum | PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAny options:nil];

    if (!self.parentController.canTakeOrChooseVideo)
    {
        fetchOptions.predicate = [NSPredicate predicateWithFormat:@"mediaType = %i",PHAssetMediaTypeImage];
    }

    for (PHAssetCollection *sub in self.assetsFetchResult)
    {
        PHFetchResult *assetsInCollection = [PHAsset fetchAssetsInAssetCollection:sub options:nil];

        for (PHAsset *asset in assetsInCollection)
        {
            NSLog(@"%@",[self nameForAlbumInCollection:sub]);

            [self.recentsCollectionDataSource addObject:asset];

            if (![segmentTitles containsObject:@"Recents"])
            {
                [segmentTitles addObject:@"Recents"];
                [segmentTitles addObject:@"Albums"];
            }

            if (asset.isFavorite)
            {
                [self.favoritesCollectionDataSource addObject:asset];

                if (![segmentTitles containsObject:@"Favorites"])
                {
                    [segmentTitles addObject:@"Favorites"];
                }
            }
        }
    }
}

Answer 1

这就是我在我的项目中制作专辑名称列表的方式。您可能需要稍微偏离一下，但这应该可行。

NSArray *collectionsFetchResults;
NSMutableArray *localizedTitles = [[NSMutableArray alloc] init];

PHFetchResult *smartAlbums = [PHAssetCollection       fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum
                                                                      subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
PHFetchResult *syncedAlbums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum
                                                                subtype:PHAssetCollectionSubtypeAlbumSyncedAlbum options:nil];
PHFetchResult *userCollections = [PHCollectionList fetchTopLevelUserCollectionsWithOptions:nil];

// Add each PHFetchResult to the array
collectionsFetchResults = @[smartAlbums, userCollections, syncedAlbums];

for (int i = 0; i < collectionsFetchResults.count; i ++) {

    PHFetchResult *fetchResult = collectionsFetchResults[i];

    for (int x = 0; x < fetchResult.count; x ++) {

        PHCollection *collection = fetchResult[x];
        localizedTitles[x] = collection.localizedTitle;

    }
}