Swift 3 UICollectionView navigation Buttons

UICollectionViewButtons.swift

 @IBAction private func locationLeftButton(_ sender: UIButton) {
        let visibleItems: NSArray = self.locationsCollectionView.indexPathsForVisibleItems as NSArray
        let currentItem: IndexPath = visibleItems.object(at: 0) as! IndexPath
        let prevItem: IndexPath = IndexPath(item: currentItem.item - 1, section: 0)
        if prevItem.row != -1 {
            self.locationsCollectionView.scrollToItem(at: prevItem, at: .right, animated: true)
        }
    }
    
    @IBAction private func locationRightButton(_ sender: UIButton) {
        let visibleItems: NSArray = self.locationsCollectionView.indexPathsForVisibleItems as NSArray
        let currentItem: IndexPath = visibleItems.object(at: 0) as! IndexPath
        let nextItem: IndexPath = IndexPath(item: currentItem.item + 1, section: 0)
        // StoredLocationsData is your collection view cell array
        if nextItem.row < storedLocationsData.count {
            self.locationsCollectionView.scrollToItem(at: nextItem, at: .left, animated: true)
        }
    }