Fetch PHAsset with 'hidden = YES' predicate crash

Question

As listed in documentation, PHAsset supports hidden (or isHidden) fetch key. But when I'm trying to fetch hidden assets my app crashing with following log:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Unsupported predicate in fetch options: hidden == 1'

Here is sample code:

PHFetchOptions *options = [[PHFetchOptions alloc] init];
options.wantsIncrementalChangeDetails = YES;
options.includeAllBurstAssets = YES;
options.includeHiddenAssets = YES;
options.predicate = [NSPredicate predicateWithFormat:@"hidden = YES"];

PHFetchResult *fetchResult = [PHAsset fetchAssetsWithOptions:options];

return fetchResult;

Answer 1

I did not read the question carefully in my first answer, perhaps this will help

If you only want the Hidden Albums why not use ? subtype:PHAssetCollectionSubtypeSmartAlbumAllHidden

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

PHFetchResult *albums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumAllHidden options:nil];