UIPickerView delegate inside of TableViewCell not called

I have a TableViewCell that contains a UIPickerView. The problem is, that the delegate of UIPickerView is not getting called

extension ViewController: UITableViewDelegate, UITableViewDataSource {    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {        return 3    }    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {        let cell = tableView.dequeueReusableCell(withIdentifier: "testCell") as! TableViewCell        cell.setupCell(indexPath: indexPath.row)        return UITableViewCell()    }}class TableViewCell: UITableViewCell {    public var picker = UIPickerView()    private var index = 1    override func awakeFromNib() {        super.awakeFromNib()        // Initialization code        print("awakeFromNib")        picker.dataSource = self        picker.delegate = self            }    public func setupCell(indexPath: Int) {        print("setupcell")        index = indexPath        contentView.addSubview(picker)        picker.translatesAutoresizingMaskIntoConstraints = false        picker.leadingAnchor.constraint(equalTo: contentView.layoutMarginsGuide.leadingAnchor).isActive = true        picker.trailingAnchor.constraint(equalTo: contentView.layoutMarginsGuide.trailingAnchor).isActive = true        picker.topAnchor.constraint(equalTo: contentView.bottomAnchor).isActive = true    }}extension TableViewCell: UIPickerViewDataSource, UIPickerViewDelegate {    func numberOfComponents(in pickerView: UIPickerView) -> Int {                return 3    }    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {        return 10    }    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {        return "abc"    }}

I tried to reload picker using picker.reloadAllComponents(), but then only func numberOfComponents(in pickerView: UIPickerView) is getting called. What am i missing? The problem is for sure with my cell.