infinite scrolling of collectionView

scroll.swift

func infinateLoop(scrollView: UIScrollView) {
        var index = Int((scrollView.contentOffset.x)/(scrollView.frame.width))
        guard currentIndex != index, let banners = banners else {
            //currentIndex = index
            return
        }
        currentIndex = index
        if index <= 0 {
            index = banners.count - 1
            let adjust = isDragging ? 1 : 0
            scrollView.setContentOffset(CGPoint(x: (scrollView.frame.width + (scrollView.frame.width / 2 - adjust)) * CGFloat(banners.count), y: 0), animated: false)
        } else if index >= banners.count + 1 {
            index = 0
            scrollView.setContentOffset(CGPoint(x: (scrollView.frame.width), y: 0), animated: false)
        } else {
            index -= 1
        }
        Log.d(">>>>>>>>>> index = \(index), currentIndex = \(currentIndex), offset=\(scrollView.contentOffset.x)")
    }
    
    func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
        infinateLoop(scrollView: scrollView)
        isDragging = false
    }
    
    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        infinateLoop(scrollView: scrollView)
    }