// 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)
}
}
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