title: Added navigation bar but there is no back button?
body: <p>I created a table view and from there let say a user pressed a cell it will go to the detailItemView , but the only problem right now is that whenever a user is in detailItemView there is no back button even thought I already embed a navigation Controller</p>
  
  <p>Here's the code that will perform a segue once a user pressed a cell:</p>
  
  <pre><code>override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
  
      // Get the new view controller using [segue destinationViewController].
      var nav = segue.destinationViewController as! UINavigationController
      var detailScene = nav.topViewController as! DetailViewController
  
  
      // Pass the selected object to the destination view controller.
      if let indexPath = self.tableView.indexPathForSelectedRow() {
          let row = Int(indexPath.row)
          detailScene.currentObject = objects?[row] as? PFObject
      }
  }
  </code></pre>
  
  <p>The screenshot for the storyboard:</p>
  
  <p><img src="https://i.stack.imgur.com/Z9k9N.png" alt="enter image description here"></p>
  
  <p>edited Screenshot</p>
  
  <p><img src="https://i.stack.imgur.com/QcIga.png" alt="enter image description here"></p>
  
  <p>I tried to do the answer below but there is still no back button</p>
  
  <p>Another screenshot, the detailView controller doesn't have a back button</p>
  
  <p><img src="https://i.stack.imgur.com/nVjrq.png" alt="enter image description here"></p>