title: UIButton does not work when hidden
body: <p>I am hiding a UIButton underneath a UITextField. Normally, the UIButton responds just find. However, when I set it to hidden (or when I set alpha to 0), it stops working. </p>
  
  <p>For context, I am including a hidden button under a UITextField because the clickable area to edit the textfield is small--I'd like the user to be able to click anywhere in the neighborhood of the uitextfield in order to make the text field become the first responder. Thus, the code for the button is:</p>
  
  <pre><code>- (IBAction)enterTextField:(id)sender {
      [nameTextField becomeFirstResponder];
      NSLog(@"Pressed");
  }
  </code></pre>
  
  <p>However, this code does not get called when the button is hidden. Otherwise, it does get called.</p>