override func viewDidDisappear(_ animated: Bool) {
    super.viewDidDisappear(animated)
    viewModel.viewDidDisappear()
}

override func willMove(toParent parent: UIViewController?) { 
    super.willMove(toParent: parent)
    if parent == nil { //detect "Back" tapping
        viewModel.willMoveToParent()
    }
}

override func viewDidLoad() {
    super.viewDidLoad()
    configureUI(with: viewModel)
}