// set this as the Root viewController of a navigation controller

class NavTestVC: UIViewController {
	var navID: Int = 0
	
	@objc func btnTap(_ sender: Any?) {
		let vc = NavTestVC()
		vc.navID = self.navID + 1
		navigationController?.pushViewController(vc, animated: true)
	}

	override func viewDidLoad() {
		super.viewDidLoad()
		
		view.backgroundColor = UIColor(white: 0.95, alpha: 1.0)
		
		var config = UIButton.Configuration.filled()
		config.buttonSize = .medium
		config.cornerStyle = .medium
		config.title = "Push"
		
		let btnA = UIButton(configuration: config)
		btnA.addAction (
			UIAction { _ in
				self.btnTap(nil)
			}, for: .touchUpInside
		)

		let label = UILabel()
		
		label.translatesAutoresizingMaskIntoConstraints = false
		view.addSubview(label)
		btnA.translatesAutoresizingMaskIntoConstraints = false
		view.addSubview(btnA)

		let g = view.safeAreaLayoutGuide
		NSLayoutConstraint.activate([
			label.topAnchor.constraint(equalTo: g.topAnchor, constant: 40.0),
			label.centerXAnchor.constraint(equalTo: g.centerXAnchor),
			btnA.topAnchor.constraint(equalTo: label.bottomAnchor, constant: 40.0),
			btnA.centerXAnchor.constraint(equalTo: g.centerXAnchor),
		])
		
		label.text = "This navID: \(navID)"
	}
	
	override func viewWillAppear(_ animated: Bool) {
		super.viewWillAppear(animated)
		print("navID:", navID, #function)
	}
	override func viewDidAppear(_ animated: Bool) {
		super.viewDidAppear(animated)
		print("navID:", navID, #function)
	}
	override func viewWillDisappear(_ animated: Bool) {
		super.viewWillDisappear(animated)
		print("navID:", navID, #function)
	}
	
}