添加到超级视图时，带有表视图崩溃的下拉列表

Question

我想调用 tableview dropdownlist，但它会在 viewcontroller 上崩溃，因为 superview!.addSubview(transparentView) 单击了文本字段 textbegin。我怎样才能以最好的方式将下拉列表与表格视图一起使用。请帮助下拉菜单

我想从 viewController 调用函数

 private var dropdownMenu: RegistrationDropdownMenu = RegistrationDropdownMenu(identifier: RegStepTwoIndentifier.regStepTwoTable)
RegistrationDropdownMenu().openDropdownMenu(inputField: inputField)

class RegistrationDropdownMenu: UITableView {
    private var identifier: String
    private var inputField: InputField?
    private var data: [RegistrationAPIResponse.RegistartionItems] = []
    private var transparentView = UIView()
    private var maxHeight: CGFloat = 300
    public var isDropdownMenuOpened: Bool = false

    init(identifier: String) {
        self.identifier = identifier
        super.init(frame: .zero, style: .plain)
        configDropdownMenu()
    }

    private func configDropdownMenu() {
        self.delegate = self
        self.dataSource = self
        self.translatesAutoresizingMaskIntoConstraints = false
        self.register(RegistrationCell.self, forCellReuseIdentifier: identifier)
        self.allowsSelection = true
        self.separatorStyle = .none
        self.layer.masksToBounds = true
        self.backgroundColor = Styles.dropDownMenuBackgroundColor
        self.layer.borderColor = Styles.borderColor.cgColor
        self.layer.borderWidth = Styles.borderWidth
        self.rowHeight = UITableView.automaticDimension
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

extension RegistrationDropdownMenu {
    public func openDropdownMenu(inputField: inputField) {
        isDropdownMenuOpened = true
        self.inputField = inputField
        data = RegistrationDataRepository().get(for: .birthdayMonth)
        self.layoutIfNeeded()
        guard let keyWindow = UIApplication.shared.windows.first(where: { $0.isKeyWindow }) else { return }
        let frames = inputField.convert(inputField.bounds, to: keyWindow)
        superview!.addSubview(transparentView)
        superview!.addSubview(self)
        self.reloadData()
        self.scrollToRow(at: IndexPath(row: 0, section: 0), at: .top, animated: false)
        self.frame = CGRect(
            x: frames.origin.x,
            y: frames.origin.y + frames.height - 1,
            width: frames.width,
            height: maxHeight
        )
    }

    public func closeDropDownMenu() {
        self.scrollToRow(at: IndexPath(row: 0, section: 0), at: .top, animated: false)
        isDropdownMenuOpened = false
        self.data = []
        guard let keyWindow = UIApplication.shared.windows.first(where: { $0.isKeyWindow }) else { return }
        let frames = inputField!.convert(inputField!.bounds, to: keyWindow)
        self.transparentView.alpha = 0
        self.frame = CGRect(x: frames.origin.x, y: frames.origin.y + frames.height, width: frames.width, height: 0)
    }

    @objc private func backgroundBehavior() {
        closeDropDownMenu()
    }
}

extension RegistrationDropdownMenu: UITableViewDelegate, UITableViewDataSource {
    func tableView(_ tableview: UITableView, numberOfRowsInSection section: Int) -> Int {
        return data.count
    }

    func tableView(_ tableview: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableview.dequeueReusableCell(withIdentifier: identifier, for: indexPath)
        cell.textLabel?.text = data[indexPath.row].label
        cell.textLabel?.font = UIFont.systemFont(ofSize: Styles.dropdownMenuTextSize, weight: .regular)
        cell.textLabel?.textColor = Styles.dropDownMenuTextColor
        cell.textLabel?.numberOfLines = 3
        cell.textLabel?.lineBreakMode = .byWordWrapping
        return cell
    }

    func tableView(_ tableview: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        return Styles.dropdownMenuRowSize
    }

    func tableView(_ tableview: UITableView, didSelectRowAt indexPath: IndexPath) {
        inputField!.text = data[indexPath.row].label
        closeDropDownMenu()
    }
}

class RegistrationCell: UITableViewCell {}

[TableView] Warning once only: UITableView was told to layout its visible cells and other contents without being in the view hierarchy (the table view or one of its superviews has not been added to a window). This may cause bugs by forcing views inside the table view to load and perform layout without accurate information (e.g. table view bounds, trait collection, layout margins, safe area insets, etc), and will also cause unnecessary performance overhead due to extra layout passes. Make a symbolic breakpoint at UITableViewAlertForLayoutOutsideViewHierarchy to catch this in the debugger and see what caused this to occur, so you can avoid this action altogether if possible, or defer it until the table view has been added to a window. Table view: <Hong_Kong_International_Airport.RegistrationDropdownMenu: 0x7ff007190800; baseClass = UITableView; frame = (20 312; 335 300); clipsToBounds = YES; gestureRecognizers = <NSArray: 0x600000f971b0>; layer = <CALayer: 0x600001c6e700>; contentOffset: {0, 0}; contentSize: {335, 572}; adjustedContentInset: {0, 0, 0, 0}; dataSource: <Hong_Kong_International_Airport.RegistrationDropdownMenu: 0x7ff007190800; baseClass = UITableView; frame = (20 312; 335 300); clipsToBounds = YES; gestureRecognizers = <NSArray: 0x600000f971b0>; layer = <CALayer: 0x600001c6e700>; contentOffset: {0, 0}; contentSize: {335, 572}; adjustedContentInset: {0, 0, 0, 0}; dataSource: <Hong_Kong_International_Airport.RegistrationDropdownMenu: 0x7ff007190800>>>