I’ve mentioned a number of resources related to custom UICollectionView layouts such as this tutorial on making great looking custom UICollectionView layouts and most recently a flow layout that provides a grid view supporting swipe to select and deselect gestures.
Here’s a custom UICollectionViewFlowLayout that uses hexagonal cells submitted by Cyril Chandelier called CCHexagonFlowLayout.
With CCHexagonFlowLayout you can easily customize the orientation, size and spacing, and add in supplementary views.
You can find CCHexagonFlowLayout on Github here.
A nice hexagon UICollectionViewFlowLayout.