objective c - Replicate iOS Photos app collection view -

i'm trying figure out best way of managing 2 list/detail view of photos app. main question is, 2 collection views 2 separate layouts? or 1 changing flow layout? right i'm using 2 in 2 separate apps, i'm not sure if it's best way of doing it.

edit: i'm talking grid view of photos turning detail view of single photo swipeable (left/right).

thanks