title: Attach parameter to button.addTarget action in Swift
body: <p>I am trying to pass an extra parameter to the buttonClicked action, but cannot work out what the syntax should be in Swift.</p>
  
  <pre><code>button.addTarget(self, action: "buttonClicked:", forControlEvents: UIControlEvents.TouchUpInside)
  </code></pre>
  
  <p>Any my buttonClicked method:</p>
  
  <pre><code>func buttonClicked(sender:UIButton)
  {
      println("hello")
  }
  </code></pre>
  
  <p>Anyone any ideas?</p>
  
  <p>Thanks for your help.</p>