如何使UITableView返回到xcode的顶部？

func scrollToTop() {
    let indexPath = IndexPath(row: 0, section: 0)
    tableView.scrollToRow(at: indexPath, at: .top, animated: true)
}

func scrollToTop() {
    tableView.setContentOffset(CGPoint(x: 0, y: 0), animated: true)
}

func scrollToTop() {
    let rect = CGRect(x: 0, y: 0, width: 1, height: 1)
    tableView.scrollRectToVisible(rect, animated: true)
}