title: Selector syntax for swift 3.0
body: <p>I am trying to add target into button this way:</p>
  
  <pre><code>btnAll.addTarget(self, action: #selector(buttonTapped(_:)), for: .touchUpInside)
  </code></pre>
  
  <p>But it is giving me an error:</p>
  
  <blockquote>
    <p>Use of unresolved identifier 'buttonTapped'</p>
  </blockquote>
  
  <p>But I declared function like:</p>
  
  <pre><code>func buttonTapped(sender: UIButton) {
  
      print("All Tapped")
  }
  </code></pre>
  
  <p>Can anybody tell me what is the correct way to do this in swift 3.</p>