Expand UiPickerView only whet it tapped in Swift

I'm using pickerView in my project and i wanna make it so it will expand only when user taps on it. Than reduce after few second. How can i do it?

import UIKitclass guideMode :UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {    let places = ["SHYMBULAK","PLACE 1","PLAC 2","PLACE 3"]    @IBOutlet weak var pickerView: UIPickerView!    func numberOfComponents(in pickerView: UIPickerView) -> Int {        return 1    }    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {        pickerView.setValue(UIColor(red: 0.07, green: 0.45, blue: 0.87, alpha: 0.86), forKey: "textColor")        pickerView.borderParamm()        return places.count    }    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {        return places[row]    }    override func viewDidLoad() {        super.viewDidLoad()        pickerView.delegate = self        pickerView.dataSource = self    }