Question

我一直在尝试寻找替代方案，以便在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，我似乎无法找到替代。在localizedTitle下有PHAssetCollection，但这也不对，它只是给了我城市名称。我正在寻找可以返回群组实际名称的内容，包括与iTunes同步的内容。

如果您在应用中看到了这些操作，我们将不胜感激。 Apple鼓励我们仅将照片API用于与8.0链接的应用，因此我不想同时使用ALAssetLibrary和照片。

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列出相册名称的方法。你可能不得不偏离一点，但这应该有效。

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;

    }
}

Answer 2

我认为您可能使用的是PHCollectionList的localizedLocationNames属性。您应该在问题中提到的PHAssetCollection下使用localizedTitle。

我写了一个小实用程序类，并添加了以下方法来检索专辑名称。

+ (NSString *)localizedTitleForGroupOrCollection:(id)collection {
    NSString *title = nil;
    if ([PHAsset class]) {
        title = [collection localizedTitle];
    } else {
        title = [collection valueForProperty:ALAssetsGroupPropertyName];
    }

    return title;
}

Answer 3

位掩码不能用作PHAssetCollectionTypeAlbum，PHAssetCollectionTypeSmartAlbum和PHAssetCollectionTypeMoment未指定为位字段。它们取值1,2,3。要使位掩码工作，它们必须取值1,2,4，每个值都在不同的位上。

PHPhotoLibrary获取专辑名称

3 个答案: