ios – How to use index from table view row to determine page number

I have a table view that I am using to show chat channels inside my app.

How would I get the current page at the current visible index? I posted my code below.

    let currentVisibleIndex = indexPath.row
    let currentChannel = channelsViewModel[currentVisibleIndex]
        
        var totalPageCount: Int {
            let page = ceil(Double(channelsViewModel.count / ChatChannelsManager.channelsLimit))
            return max(1, Int(page))
        }

        var currentPageFirstIndex: Int {
            let index = totalPageCount == 1 ? 0 : (totalPageCount - 1) * ChatChannelsManager.channelsLimit
            return index
        }
        
        var currentPageLastIndex: Int {
            let index = (totalPageCount * ChatChannelsManager.channelsLimit) - 1
            return index
        }

This is the incorrect code:

       var visiblePage: Int {
            let index = currentVisibleIndex == 0 ? 1 : currentVisibleIndex
            let page = ceil(Double(index / channelsViewModel.count))
            return max(1, Int(page))
        }

       var visiblePageFirstIndex: Int {
            let index = visiblePage == 1 ? 0 : (visiblePage - 1) * ChatChannelsManager.channelsLimit
            return index
        }
        
        var visiblePageLastIndex: Int {
            let index = (visiblePage * ChatChannelsManager.channelsLimit) - 1
            return index
        }

These are some of the cases I’m trying to solve for, assuming each page has a limit of 15

Case 1:

• total pages 1
• start at channel index 0
• end at channel index 14
• current visible index 4
• current visible page 1

Case 2:

• total pages 2
• start at channel index 15
• end at channel index 29
• current visible index 18
• current visible page 2

Case 3:

• total pages 4
• start at channel index 45
• end at channel index 59
• current visible index 44
• current visible page 3

Case 4:

• total pages 4
• start at channel index 45
• end at channel index 59
• current visible index 0
• current visible page 1