title: How to blur the background when an alert is showing?
body: <p>I would like to apply a blur effect to the existing view when an alert is shown on the screen, and I am currently doing this by displaying an imageView (<code>BlurEffect:blurBackGroundSignUp</code>) on top of my view, hiding it initially and showing it when calling the following code: </p>
  
  <pre><code>[self BlurEffect:blurBackGroundSignUp];
  </code></pre>
  
  <p>The <code>BlurEffect</code> method works as I get a blurred view when I put the code in the <code>ViewDidLoad</code> method, but when I check for an alert or add the code to where I am displaying the alert it refuses to show. I am guessing there is something that needs to be overridden and I do not know how to do this.</p>