UIButton not calling action when UISearchBar in navigationBar is firstResponder - ios

Question

I want to have a UIButton in a UIViewController tappable while the user is editing text in a UISearchBar that is part of the UINavigationBar.
The UIButton is responding to touches (it shows the highlighted state), but it is not calling its action. Same problem for other UIControl classes like UISwitch.
To make it more intriguing: when placing the UISearchBar in the UIViewController's UIView, there's no problem.
What should I do in order to trigger the button action while the UISearchBar is active?
Example VC:
import UIKit
class ViewController: UIViewController {
private let button: UIButton = {
let button = UIButton(type: UIButtonType.system)
button.translatesAutoresizingMaskIntoConstraints = false
button.setTitle("Test", for: .normal)
button.setTitleColor(.green, for: .normal)
button.addTarget(self, action: #selector(buttonTapped), for: .touchUpInside)
return button
}()
private let textField: UITextField = {
let textField = UITextField()
textField.translatesAutoresizingMaskIntoConstraints = false
textField.placeholder = "place"
textField.borderStyle = .bezel
textField.addTarget(self, action: #selector(textFieldTriggered), for: .allEditingEvents)
return textField
}()
private let uiSwitch: UISwitch = {
let uiSwitch = UISwitch()
uiSwitch.translatesAutoresizingMaskIntoConstraints = false
uiSwitch.addTarget(self, action: #selector(switchToggled), for: UIControlEvents.valueChanged)
return uiSwitch
}()
private let formSearchBar: UISearchBar = {
let searchBar = UISearchBar()
searchBar.translatesAutoresizingMaskIntoConstraints = false
return searchBar
}()
private let navigationSearchBar: UISearchBar = {
return UISearchBar()
}()
init() {
super.init(nibName: nil, bundle: nil)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .white
view.addSubview(button)
view.addSubview(textField)
view.addSubview(formSearchBar)
view.addSubview(uiSwitch)
NSLayoutConstraint.activate([
view.safeAreaLayoutGuide.leadingAnchor.constraint(equalTo: button.leadingAnchor, constant: -16),
view.safeAreaLayoutGuide.topAnchor.constraint(equalTo: button.topAnchor, constant: -16),
button.bottomAnchor.constraint(equalTo: textField.topAnchor, constant: -16),
view.safeAreaLayoutGuide.leadingAnchor.constraint(equalTo: textField.leadingAnchor, constant: -16),
textField.widthAnchor.constraint(equalToConstant: 100),
textField.bottomAnchor.constraint(equalTo: formSearchBar.topAnchor, constant: -16),
view.safeAreaLayoutGuide.leadingAnchor.constraint(equalTo: formSearchBar.leadingAnchor, constant: -16),
formSearchBar.widthAnchor.constraint(equalToConstant: 100),
formSearchBar.bottomAnchor.constraint(equalTo: uiSwitch.topAnchor, constant: -16),
view.safeAreaLayoutGuide.leadingAnchor.constraint(equalTo: uiSwitch.leadingAnchor, constant: -16),
])
navigationItem.titleView = navigationSearchBar
_ = navigationSearchBar.becomeFirstResponder()
}
#objc
private func buttonTapped() {
let color = button.titleColor(for: .normal)
button.setTitleColor(color == .green ? .red : .green, for: .normal)
}
#objc
private func textFieldTriggered() {
textField.placeholder = textField.placeholder == "place" ? "holder" : "place"
}
#objc
private func switchToggled() {
UIView.animate(withDuration: 0.3) {
self.uiSwitch.isOn = !self.uiSwitch.isOn
}
}
}