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Hides navigation bar for current controller and shows it smoothly on push and hides it on pop.
override func viewWillAppear(_ animated: Bool) {
if let navigationController = navigationController,
presentedViewController == nil {
navigationController.setNavigationBarHidden(true, animated: true)
override func viewWillDisappear(_ animated: Bool) {
if let navigationController = navigationController,
presentingViewController != nil {
navigationController.setNavigationBarHidden(false, animated: true)
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