Fetch only albums in a PHCollectionList

Question

A PHCollectionList is a folder that could contain any number of albums and/or folders. I am currently fetching the collections within the list via PHCollection.fetchCollectionsInCollectionList(list, options: nil).

This could return objects of type PHAssetCollection or PHCollectionList. I am only interested in knowing of the PHAssetCollections in that list. The docs state you can apply a filter predicate using the fetch options in order to return a subset of the data, but I don't see how I would use that in order to only get albums. How do you use PHFetchOptions in order to return only PHAssetCollections in a given PHCollectionList?

score 1 · Answer 1 · answered Jul 01 '15 at 10:43

Have you tried:

    [PHCollectionList fetchCollectionListsWithType:<filterType> subtype:nil optionsnil]

Where your <ftilerType> could be anything from PHCollectionListType:

PHCollectionListTypeMomentList - Moments created by iPhone (essentially all photos grouped into Year and Collections)
PHCollectionListTypeFolder - user created Albums (folders)
PHCollectionListTypeSmartFolder - Smart folders created by the iPhone automatically

score 0 · Answer 2 · answered Oct 02 '15 at 19:56

You can use predicate to specify the album's name and use it to fetch specific Album from the collectionList.

PHFetchOptions *fetchOptions = [PHFetchOptions new];
fetchOptions.predicate = [NSPredicate predicateWithFormat:@"title = %@", ABC];

PHFetchResult *collectionsFetchResult = [PHCollection fetchCollectionsInCollectionList:self.collectionList options:fetchOptions];

PHAssetCollection *ABCAlbum = collectionsResult.firstObject;
  NSLog(@"ABC album details: %@", ABCAlbum);

Or you can put nil in options and get all of the AssetCollections in the List.

    PHFetchResult *collectionsFR = [PHCollection fetchCollectionsInCollectionList:list options:nil];
      if ( collectionsFR.count > 0) {
        for ( PHAssetCollection *collection in collectionsFR) {
          // do something with each album
          NSLog(@"collection is %@", collection);
        }
      }

Fetch only albums in a PHCollectionList

2 Answers2