I’m working on preexistent code.
I have a textfield inside a section of my tableview, anyway I try to hide the keyboard it ends up removing my view from the superview.

By adding a breakpoint inside the removeFromSuperview() I can see the resignFirstResponder() is the cause of it.

• I can’t find any explicit call to removeFromSuperview()
• The table view is not realoding, because no UITableViewDatasource function is being executed
• I registered the table view cell used as a section and dequeueReusableCell, I also tried calling it directly with Bundle.main.loadNib
• I also tried hiding the keyboard using the UIApplication singleton to see if it acted the same, and it did.

ParentTableViewController

• The first section doesn’t exist, that’s why its height is zero
• The table view is built so there’s a cellOne, section and cellTwo
• the last cell (cellTwo) is another TableView, when I scroll, the section stays as a header

extension ParentTableViewController: UITableViewDataSource, UITableViewDelegate {
func numberOfSections(in tableView: UITableView) -> Int {
return 2
}

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 1
    }

    func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        return section == 0 ? 0 : 105
    }

    func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        guard section == 1 else { return nil }
        let headerView = tableView.dequeueReusableCell(withIdentifier: SectionWithTextfieldCell.identifier) as! SectionWithTextfieldCell
        headerView.delegate = self
        headerView.setupUI(segmentIndexSelected: segmentIndexSelected, membersCount: campData.attributes?.members_count ?? 0, searchedText: viewModel?.searchUsername)
        return headerView
    }
    
    func tableView(_ tableView: UITableView,
                   cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        switch indexPath.section {
        case 0:
            let cell = tableView.dequeueReusableCell(withIdentifier: OtherCellOne.identifier) as! OtherCellOne
            cell.delegate = self
            cell.setup(campData: campData, descriptionLblLines: descriptionLblLines, segmentIndexSelected: segmentIndexSelected)
            return cell
        default:
            let cell = tableView.dequeueReusableCell(withIdentifier: OtherCellTwo.identifier, for: indexPath) as! OtherCellTwo
            cell.delegate = self
            cell.setup(campData: campData, members: members, rooms: rooms, segmentIndexSelected: segmentIndexSelected, loadingUsers: viewModel?.loadingUsers)
            return cell
        }
    }

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath, animated: false)
        self.view.endEditing(true)
    }

    func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
        cell.layoutIfNeeded()
    }

    func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
        switch indexPath.section {
        case 1:
            return heightMembersRooms
        default:
            return UITableView.automaticDimension
        }
    }

    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        switch indexPath.section {
        case 1:
            return heightMembersRooms
        default:
            return UITableView.automaticDimension
        }
    }
}

SectionWithTextfieldCell

class SectionWithTextfieldCell: UITableViewCell {

    @IBOutlet weak var searchBarTrailingConstraint: NSLayoutConstraint!
    @IBOutlet weak var searchBar: UISearchBar!
    @IBOutlet weak var cancelButton: UIButton!

    weak var delegate: Delegate?

    static var identifier: String {
        String(describing: self)
    }

    override func awakeFromNib() {
        super.awakeFromNib()
    }
    
    @IBAction func pressedCancel(_ sender: Any) {
        resetSearch() { [weak self] in
            guard let self else { return }
            searchBar.searchTextField.text = ""
            delegate?.search(username: "")
        }
    }

    func setupUI(segmentIndexSelected: Int, membersCount: Int, searchedText: String?) {
        searchBar.searchTextField.text = searchedText
        setupSearchBar()
    }

    func setupSearchBar() {
        searchBar?.delegate = self
        searchBar?.backgroundImage = UIImage()
        searchBar?.placeholder = String(localized: "Search for users by username...")
        searchBar?.clipsToBounds = true
        searchBar?.searchTextField.textColor = UIColor.init(hexString: "#585858")
        searchBar?.searchTextField.font = FontKit.roundedFont(ofSize: 15, weight: .regular)
        searchBar?.searchTextField.layer.cornerRadius = 25
        searchBar?.searchTextField.layer.masksToBounds = true
        searchBarTrailingConstraint.constant = 0
        cancelButton.setTitle(String(localized: "Cancel"), for: .normal)
        cancelButton.titleLabel?.font = FontKit.roundedFont(ofSize: 12, weight: .regular)
    }
    
    protocol Delegate: AnyObject {
        func search(username: String)
        func scrollToSearchBar()
    }
    
    func resetSearch(completion: (() -> Void)? = nil) {
        UIView.animate(withDuration: 0.3, animations: { [weak self] in
            guard let self else { return }
            searchBarTrailingConstraint.constant = 0
        }, completion: { [weak self] _ in
            guard let self else { return }
            searchBar.searchTextField.resignFirstResponder()
            completion?()
        })
    }
}


// MARK: - UISearchBarDelegate

extension SectionWithTextfieldCell: UISearchBarDelegate {
    func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
        resetSearch()
    }
    
    func searchBarShouldBeginEditing(_ searchBar: UISearchBar) -> Bool {
        UIView.animate(withDuration: 0.3, animations: { [weak self] in
            guard let self else { return }
            searchBarTrailingConstraint.constant = cancelButton.frame.width
            self.layoutIfNeeded()
        })
        delegate?.scrollToSearchBar()
        return true
    }
    
    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
        delegate?.search(username: searchText)
    }
}