title: swift 3.0 UIBarButtonItem action not work
body: <pre><code>let leftbarbuttonitem = UIBarButtonItem(title:"Reset",style: .plain, target: self, action: #selector(tapResetButton(_:)))
  
      func tapResetButton(_ sender:UIBarButtonItem){
          count = 0
          numberLabel.text = "0"
  
      }
  </code></pre>
  
  <p>The action can't respond to the click event. I added the breakpoint then found that it even didn't go into the function. I have no idea what's wrong with my code. Any answer will be appreciated. Thanks in advance.</p>