Used for providing custom paging for collection view.

CustomCollectionViewPaging.swift

func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
        let pageWidth: Float =  214+22 // PagingWidth = CellWidth + Cell Space
        let currentOffset: Float = Float(scrollView.contentOffset.x)
        let targetOffset: Float = Float(targetContentOffset.pointee.x)
        var newTargetOffset: Float = 0
        if targetOffset > currentOffset {
            newTargetOffset = ceilf(currentOffset / pageWidth) * pageWidth
        }
        else {
            newTargetOffset = floorf(currentOffset / pageWidth) * pageWidth
        }
        if newTargetOffset < 0 {
            newTargetOffset = 0
        }
        else if (newTargetOffset > Float(scrollView.contentSize.width)){
            newTargetOffset = Float(Float(scrollView.contentSize.width))
        }
        
        targetContentOffset.pointee.x = CGFloat(currentOffset)
        scrollView.setContentOffset(CGPoint(x: CGFloat(newTargetOffset), y: scrollView.contentOffset.y), animated: true)
    }