How To Hide Navigation Bar button in Swift 

[[self navigationController] setNavigationBarHidden:YES animated:YES];
 
[[self navigationController] setNavigationBarHidden:NO animated:YES];
 
override func viewWillAppear(animated: Bool)
    {
      self.navigationController?.navigationBarHidden = true
    }  
 
override func viewWillAppear(animated: Bool)
        {
          self.navigationController?.navigationBarHidden = false
        } 
 
self.navigationItem.setHidesBackButton(true, animated: false)

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