fetchAlbum.swift

let albums = PHAssetCollection.fetchAssetCollections(with: .smartAlbum, subtype: .any, options: nil) // system 앨범
let albums2 = PHAssetCollection.fetchAssetCollections(with: .album, subtype: .any, options: nil) // 사용자가 만든? 앨범

albums.enumerateObjects { (collection, _, _) in
    let title = collection.localizedTitle
    let count = PHAsset.fetchAssets(in: collection, options: nil).count
    print(title, count)
}