title: hide tab bar in view with push
body: <p>I have a <code>tabBar</code> + <code>NavigationViewController</code>. The Tab bar has collection view  with cells(Say <strong><em>view1</em></strong>) and with cells a push seague is implemented to another view(Say <strong><em>view2</em></strong>). </p>
  
  <p>In <strong><em>view2</em></strong> I want to have a <code>navBar</code> but no tab bar. </p>
  
  <p>I tried </p>
  
  <p><code>self.tabBarController?.tabBar.hidden = true</code>, </p>
  
  <p>it worked fine for <strong><em>view2</em></strong> but when I went back to <strong><em>view1</em></strong> by <strong>back button</strong> the tab was still hidden( even after in <strong><em>view1</em></strong> class I added <code>self.tabBarController?.tabBar.hidden = false</code> in <strong>viewDidLoad</strong> func). </p>
  
  <p>How can i make the tab bar reappear in <strong><em>view1</em></strong>?</p>
  
  <p>I'm working in swift. </p>