title: How to get the UIButton ID?
body: <p>I have created 5 buttons dynamically in Swift like this:</p>
  
  <pre><code>for theIndex in 0..&lt;5 {
  
          let aButton = UIButton()
          aButton.frame = CGRectMake(self.view.bounds.width / 2 - 120, self.view.bounds.height / 2 - 150, 240, 300)
          aButton.setTitle("Button \(theIndex)", forState: .Normal)
          aButton.addTarget(self, action: "btnClicked:", forControlEvents:.TouchUpInside)
  
          self.view.addSubview(aButton) 
      }
  </code></pre>
  
  <p>But how can I get the <strong>BUTTON_ID</strong> for each one?</p>
  
  <pre><code> func btnClicked(sender: AnyObject?) {
          let vc = storyboard!.instantiateViewControllerWithIdentifier("vc_name") as! DetailVC
          vc.selectedId = **WANT_TO_PASS_BUTTON_ID_HERE**
          self.presentViewController(vc, animated:true, completion:nil)
      }
  </code></pre>