ios - 使用 iOS Photos Framework 如何列出所有可用的 PHAssetCollections？

Question

使用 iOS Photos Framework 如何列出所有可用的 PHAssetCollections？我想找到“Photo Roll”集合，以便我可以从该集合中检索所有照片，特别是。我如何使用新的 PhotosFramework 在 iOS 8+ 上做到这一点？

Answer 1

如果您查看 PhotoTypes，您会发现相机胶卷不包含在 PH 中， 你可以通过

PHFetchResult *result = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum
                                                               subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary
                                                               options:nil];
PHAssetCollection *assetCollection = result.firstObject;
NSLog(@"%@", assetCollection.localizedTitle);  // Camera Roll

一般来说，这是获取所有内容的方法

PHFetchOptions *options = [[PHFetchOptions alloc] init];
options.wantsIncrementalChangeDetails = YES;
options.predicate = [NSPredicate predicateWithFormat:@"mediaType == %d",PHAssetMediaTypeImage];

PHFetchResult *albums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
for (PHAssetCollection *sub in albums)
{
    PHFetchResult *fetchResult = [PHAsset fetchAssetsInAssetCollection:sub options:options];
}

#pragma mark - PHAssetCollection types

typedef NS_ENUM(NSInteger, PHAssetCollectionType) {
  PHAssetCollectionTypeAlbum      = 1,
  PHAssetCollectionTypeSmartAlbum = 2,
  PHAssetCollectionTypeMoment     = 3,
} NS_ENUM_AVAILABLE_IOS(8_0);

typedef NS_ENUM(NSInteger, PHAssetCollectionSubtype) {

// PHAssetCollectionTypeAlbum regular subtypes
PHAssetCollectionSubtypeAlbumRegular         = 2,
PHAssetCollectionSubtypeAlbumSyncedEvent     = 3,
PHAssetCollectionSubtypeAlbumSyncedFaces     = 4,
PHAssetCollectionSubtypeAlbumSyncedAlbum     = 5,
PHAssetCollectionSubtypeAlbumImported        = 6,

// PHAssetCollectionTypeAlbum shared subtypes
PHAssetCollectionSubtypeAlbumMyPhotoStream   = 100,
PHAssetCollectionSubtypeAlbumCloudShared     = 101,

// PHAssetCollectionTypeSmartAlbum subtypes
PHAssetCollectionSubtypeSmartAlbumGeneric    = 200,
PHAssetCollectionSubtypeSmartAlbumPanoramas  = 201,
PHAssetCollectionSubtypeSmartAlbumVideos     = 202,
PHAssetCollectionSubtypeSmartAlbumFavorites  = 203,
PHAssetCollectionSubtypeSmartAlbumTimelapses = 204,
PHAssetCollectionSubtypeSmartAlbumAllHidden  = 205,
PHAssetCollectionSubtypeSmartAlbumRecentlyAdded = 206,
PHAssetCollectionSubtypeSmartAlbumBursts     = 207,
PHAssetCollectionSubtypeSmartAlbumSlomoVideos = 208,
PHAssetCollectionSubtypeSmartAlbumUserLibrary = 209,

// Used for fetching, if you don't care about the exact subtype
PHAssetCollectionSubtypeAny = NSIntegerMax
} NS_ENUM_AVAILABLE_IOS(8_0);