title: accessing UIButton by (id)sender
body: <p>I have the following code</p>
  
  <pre><code>-(IBAction)ATapped:(id)sender{
  //want some way to hide the button which is tapped
  self.hidden = YES;
  }
  </code></pre>
  
  <p>Which is linked to multiple buttons. I want to hide the button which triggered this IBAction. 
  self.hidden is obviously not the button. </p>
  
  <p>How do I hide the button which was tapped? The sender.</p>
  
  <p>Thanks</p>