Navigation bar not showing iOS swift

Question

I am having multiple view controller in my application. I want to hide navigationbar in my first view controller. So I use the following code to hide the navigation

Answer 1

do like in viewcontroller based hidden using Swift 4.0

To hide navigationController in viewWillAppear

override func viewWillAppear(animated: Bool) {
     super.viewWillAppear(animated)
    self.navigationController?.isNavigationBarHidden = true
}

To unhide navigationController in viewWillDisappear

override func viewWillDisappear(animated: Bool)
{
    super.viewWillDisappear(animated)
    self.navigationController?.isNavigationBarHidden = false
}