DidSelectItemAt.swift

// For one dimensional array
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
	let item = mediaItems[indexPath.item]
	let pagedMediaViewController = PagedMediaController(mediaItem: item, currentIndex: indexPath.item)
	pagedMediaViewController.modalPresentationStyle = .overFullScreen
	present(pagedMediaViewController, animated: true)
}

//	In case you're dealing with a two dimensional array like I was dealing with since the collection view's items
//	had sections
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
	let item = mediaItems[indexPath.section][indexPath.item]
	let joinedItems = mediaItems.flatMap { $0 }
	guard let currentIndexForPagedMediaVC = joinedItems.firstIndex(of: item) else { return }
	let pagedMediaViewController = PagedMediaController(mediaItem: item, currentIndex: currentIndexForPagedMediaVC)
	pagedMediaViewController.modalPresentationStyle = .overFullScreen
	present(pagedMediaViewController, animated: true)
}