如何正确隐藏/显示导航栏

Question

I have an app with some viewControllers. Only one viewController must not display the navigationBar , so in this controller I have:

override func viewWillAppear(animated: Bool) {
      self.navigationController?.setNavigationBarHidden(true,animated:true)
}

Now, I noticed that this is a global setting because anytime I access another viewController the navigation bar is hidden.

So, in every viewController , in my viewWillAppear , I will make it visible again.

But, is this the way to go?

Answer 1

You can set the navigationBar to hidden in the viewWillAppear and to visible in the viewWillDisappear of this one viewController like that:

override func viewWillAppear(animated: Bool) {
  self.navigationController?.setNavigationBarHidden(true,animated:true)
}


override func viewWillDisappear(animated: Bool) {
  self.navigationController?.setNavigationBarHidden(false,animated:true)
}

Answer 2

In your UIViewController, if you are using a referencing outlet for the UINavigationBar, then you can change the state via the 'hidden' property, where myNavigationBar is the IBOutlet you defined:

override func viewWillAppear(animated: Bool) {
    self.myNavigationBar.hidden = true
}

Edit: seeing marc's answer, I am curious to know whether the property or the function is the preferred way to go?