title: How to open another view controller when OK is pressed in alert.addAction in iOS 9
body: <p>I want to display a viewcontroller called InViewController, when the "OK" from the <code>add.alertAction</code> is pressed. </p>
  
  <pre><code>if ((user) != nil) {               
     let alert = UIAlertController(title: "Success", message:   "Logged In", preferredStyle: .Alert)
     alert.addAction(UIAlertAction(title: "OK", style: .Default) { _ in })
     self.presentViewController(alert, animated: true){}
  }
  </code></pre>