选择文本字段时,使UITableView滚动

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    tableView.deselectRow(at: indexPath, animated: true)
    let cell = tableView.cellForRow(at: indexPath) as! CustomTableViewCell
    cell.textField.becomeFirstResponder()
}

func textFieldDidBeginEditing(_ textField: UITextField) {
    if let superview = textField.superview {
        let origin = superview.convert(textField.frame.origin, to: tableView)
        let indexPath = tableView.indexPathForRow(at: origin)
        if let indexPath = indexPath {
            tableView.scrollToRow(at: indexPath, at: .top, animated: true)
        }
    }
}