title: Cannot convert value of type '() -> ()' to expected argument type 'Selector'
body: <p>I encountered this error when I used the selector.</p>
  
  <p>I am using xcode9.0 swift4.</p>
  
  <p><a href="https://i.stack.imgur.com/9cQpo.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9cQpo.png" alt="enter image description here"></a></p>
  
  <p><strong>Error</strong></p>
  
  <p><a href="https://i.stack.imgur.com/00LoP.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/00LoP.png" alt="enter image description here"></a></p>
  
  <p>Any suggestion will be appreciated</p>