The abstract superclass for Photos asset collections and collection lists.
Declaration
class PHCollection
Overview
You do not create or work with instances of this class directly. Instead, use one of its two concrete subclasses, PHAssetCollection or PHCollectionList.
A PHAssetCollection object represents a collection of photo or video assets, such as an album, moment, or Shared Photo Stream.
A PHCollectionList object represents a collection that contains other collections, such as a a folder containing albums or the set of all moments in a calendar year.