When using hidesBottomBarWhenPushed, i want the tab bar to reappear when i push another view

Question

I have a navigation controller. For one of the views i want to hide the bottom tab bar, so it gets the max possible screen real estate. To do this, i have:

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Answer 1

Case one: To hide UITabbarController in a cetain UIVIewController, for example while calling self.performSegueWithIdentifier("Identifier", sender: self), it is necesssary prior to to that, set self.hidesBottomBarWhenPushed = true flag. And after self.hidesBottomBarWhenPushed = false flag. But we have to understad that through one UIViewController, UITabbarController will re-appear and, in case if you need to use UITabbarController with single UIViewControler, it wont yield right result.

in the FirstItemViewController

    @IBAction func pushToControllerAction(sender: AnyObject) {
        self.hidesBottomBarWhenPushed = true
        self.performSegueWithIdentifier("nextController", sender: self)
        self.hidesBottomBarWhenPushed = false
    }

Case Two: To hide UITabbarController in a certain UIVIewController, after which a UITabbarController should be popped, it is necessary, for example, while calling self.performSegueWithIdentifier("nextController", sender: self) , to set self.hidesBottomBarWhenPushed = true before the method. Alse willMoveToParentViewController(parent: UIViewController?) in the method should be configured as it shown in the code example.

in the first UIViewController "FirstItemViewController"

 @IBAction func pushToControllerAction(sender: AnyObject) {
     self.hidesBottomBarWhenPushed = true
     self.performSegueWithIdentifier("nextController", sender: self)
 }

in the next UIViewController "ExampleViewController"`

 override func willMoveToParentViewController(parent: UIViewController?) {
         if parent == nil {
             var viewControllers = self.navigationController!.viewControllers
             if ((viewControllers[viewControllers.count - 2]).isKindOfClass(FirstItemViewController.self)) {
                 (viewControllers[viewControllers.count - 2] as! FirstItemViewController).hidesBottomBarWhenPushed = false
             }
         }
 }

Swift 3 code:

let viewControllers = self.navigationController!.viewControllers
                if ((viewControllers[viewControllers.count - 2]) is (FirstItemViewController)) {
                    (viewControllers[viewControllers.count - 2] as! FirstItemViewController).hidesBottomBarWhenPushed = false
                }

Test project