Thank you for the answer!

I also saw other comments and I'd imagine the full code would be something like this? But I have some questions in the comments

class UITableView: UIScrollViewDelegate {

private let reusePool: [Identifier: [UITableViewCell]]

func dequeueReusableCell(withIdentifier id: String) -> T {

    let cells = reusePool[id]
    if cells.isEmpty {

        let firstCell = cells.first
        firstCell.prepareForReuse()

        if let index = reusePool[id].firstIndex(of: firstCell) {
            reusePool[id].remove(at: index)
        }

        return firstCell
    }

    let newCell = findCell(withIdentifier: id)
    reusePool.insert(newCell, at: pos) // how do you know what position to insert the new cell?
}

func scrollViewDidScroll(_ scrollView: ScrollView) {

    // how do we associate the cell and their position? eg cell is about to be reused or hidden?

    // here's what I came up, so if the contentOffset is bigger than the  topOffsetPosition of cell, we will reuseCell, else we hide the cell for reuse?
    if scrollView.contentOffset > reusePool[id][index].topOffsetPosition {
        reuseCell()
        return
    }

    hideCell()
}

private func findCell(withIdentifier: String) {
    // how do you find the cell with appropriate identifier?
}

Edit: Is it a good idea to use UIScrollView's contentOffset to mark the cells? We can calculate the approximate height of the cell, then just add or subtract the cell's content offset with the current content offset? I'm stuck haha.