如何防止Tableview回到顶部？

var currentVisibleCells: [IndexPath] = []

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    currentVisibleCells = tableView.indexPathsForVisibleRows ?? []
}

func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
    if !decelerate {
        scrollToSavedVisibleCells()
    }
}

func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
    scrollToSavedVisibleCells()
}

func scrollToSavedVisibleCells() {
    if !currentVisibleCells.isEmpty {
        tableView.scrollToRow(at: currentVisibleCells[0], at: .top, animated: true)
    }
}

tableView.estimatedRowHeight = 0
tableView.rowHeight = UITableView.automaticDimension

tableView.reloadData()