具有searchBar的ExpandableCell

Question

我具有ExpandableCell的表格视图！这个tableView从互联网上加载所有数据！当它从服务器解析JSON时，以及当我搜索它给我一个正确的结果但单击单元格扩展单元格时，它的工作都很好。该应用程序崩溃了！ func cellOpened（sender：UIButton）函数中发生的崩溃我该如何解决这个问题！

var aide = [AIDE]()
var filteredAide = [AIDE]()

//searchBar
var inSearchMode = false

var t_count:Int = 0
var lastCell: StackViewCell = StackViewCell()
var button_tag:Int = -1
let cellSpacingHeight: CGFloat = 5
var results: [String : AnyObject]?
@IBOutlet weak var tableView: UITableView!
@IBOutlet weak var searchBar: UISearchBar!


override func viewDidLoad() {
    super.viewDidLoad()
    loadQuestion()
    searchBar.delegate = self
    tableView.register(UINib(nibName: "StackViewCell", bundle: nil), forCellReuseIdentifier: "StackViewCell")
    tableView.delegate = self
    tableView.dataSource = self
    tableView.allowsSelection = false
    tableView.separatorStyle = .none

}//END

func loadQuestion() {
    API.getAideList { (error, aide: [AIDE]?) in
        if let aide = aide {
            self.aide = aide
            self.tableView.reloadData()
            ALLoadingView.manager.hideLoadingView()
        }
    }
}

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    if indexPath.row == button_tag {
        return 0.25*self.view.frame.height
    } else {
        return 0.08*self.view.frame.height
    }
}

func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
    return cellSpacingHeight
}

func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
    let headerView = UIView()
    headerView.backgroundColor = UIColor.clear
    return headerView
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return (inSearchMode) ? filteredAide.count : aide.count
}


func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "StackViewCell", for: indexPath) as! StackViewCell
    if !cell.cellExists {
        let aideData = (inSearchMode) ? filteredAide[indexPath.row] : aide[indexPath.row]
        cell.backgroundColor = UIColor.white
        cell.layer.borderColor = UIColor.black.cgColor
        cell.textView.text = aideData.FaqAnswer
        cell.open.setTitle(aideData.FaqQuestion, for: .normal)
        cell.plusButton.text = "+"
        cell.open.tag = t_count
        cell.openVtwo.tag = t_count
        cell.open.addTarget(self, action: #selector(cellOpened(sender:)), for: .touchUpInside)
        cell.openVtwo.addTarget(self, action: #selector(cellOpened(sender:)), for: .touchUpInside)
        t_count += 1
        cell.cellExists = true
    } else {
        let aideData = (inSearchMode) ? filteredAide[indexPath.row] : aide[indexPath.row]
        cell.backgroundColor = UIColor.white
        cell.layer.borderColor = UIColor.black.cgColor
        cell.textView.text = aideData.FaqAnswer
        cell.open.setTitle(aideData.FaqQuestion, for: .normal)
        cell.plusButton.text = "+"
        cell.open.tag = t_count
        cell.openVtwo.tag = t_count
        cell.open.addTarget(self, action: #selector(cellOpened(sender:)), for: .touchUpInside)
        cell.openVtwo.addTarget(self, action: #selector(cellOpened(sender:)), for: .touchUpInside)
        t_count += 1
        cell.cellExists = true
    }

    UIView.animate(withDuration: 0) {
        cell.contentView.layoutIfNeeded()
    }
    return cell
}

@objc func cellOpened(sender:UIButton) {
    self.tableView.beginUpdates()

    let previousCellTag = button_tag

    if lastCell.cellExists {
        self.lastCell.animate(duration: 0.2, c: {
            self.view.layoutIfNeeded()
        })
        if sender.tag == button_tag {

            button_tag = -1
            lastCell = StackViewCell()
        }
    }

    if sender.tag != previousCellTag {
        button_tag = sender.tag

        lastCell = tableView.cellForRow(at: IndexPath(row: button_tag, section: 0)) as! StackViewCell
        self.lastCell.animate(duration: 0.2, c: {
            self.lastCell.plusButton.text = "-"
            self.view.layoutIfNeeded()
        })
    }
    self.tableView.endUpdates()
}

let userType = currentUser.integer(forKey: "user_type")
@IBAction func backBtnPressed(_ sender: Any) {
    dismiss(animated: true, completion: nil)

}//END


//SearchBar
func searchBarShouldBeginEditing(_ searchBar: UISearchBar) -> Bool {
    inSearchMode = false
    searchBar.setShowsCancelButton(true, animated: true)
    return true
}//END

func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {
    inSearchMode = false
    self.searchBar.endEditing(true)
    searchBar.showsCancelButton = false
    searchBar.resignFirstResponder()
    tableView.reloadData()
}//END

func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
    inSearchMode = false
    tableView.reloadData()
    view.endEditing(true)
    tableView.reloadData()
}//END

func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
    searchBar.text = ""
    inSearchMode = false
    tableView.reloadData()
    view.endEditing(true)
}//END

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {

    if searchBar.text == nil || searchBar.text == "" {
        inSearchMode = false
        tableView.reloadData()
        view.endEditing(true)
    } else {

        inSearchMode = true
        _ = searchBar.text!.lowercased()

        filteredAide = aide.filter({ (aide: AIDE) -> Bool in
            return aide.FaqQuestion.lowercased().contains(searchText.lowercased()) || aide.FaqAnswer.lowercased().contains(searchText.lowercased())
        })
        self.tableView.reloadData()
    }

}//END