title: How to show Navigation Left bar button?
body: <p>Developing an iOS application with Xcode ver 9.3, Swift.</p>
  
  <p>Navigation Left bar button does not appear. Could you tell me how to show Left bar button?</p>
  
  <p>When I tried the button on the right side with the same code, it displayed without any problem.</p>
  
  <p>The code and the storyboard are as follows.</p>
  
  <p><strong>Code of First TableView</strong></p>
  
  <pre><code>import UIKit
  
  class TableViewController: UITableViewController {
  
      override func viewDidLoad() {
          super.viewDidLoad()
  
          let naviButton = UIBarButtonItem(title: "naviButton", style: UIBarButtonItemStyle.plain, target: self, action: #selector(Tapped))
  
          // Left bar button does not appear
          self.navigationItem.leftBarButtonItem = naviButton
  
          // Right bar button do appear
          self.navigationItem.rightBarButtonItem = naviButton
  
          // Uncomment the following line to preserve selection between presentations
          // self.clearsSelectionOnViewWillAppear = false
  
          // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
          // self.navigationItem.rightBarButtonItem = self.editButtonItem
      }
  
      @objc func Tapped() {
          print("Tapped")
      }
  
  ...
  </code></pre>
  
  <p><strong>Storyboard</strong></p>
  
  <p><a href="https://i.stack.imgur.com/zmUGp.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zmUGp.png" alt="Storyboard"></a></p>
  
  <p><strong>Simulator</strong></p>
  
  <p><a href="https://i.stack.imgur.com/8cu7X.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8cu7X.png" alt="enter image description here"></a></p>