title: how to make exact blur
body: <p><a href="https://i.stack.imgur.com/SkIi2.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SkIi2.png" alt="enter image description here"></a>
  I want Blur actual like first Image.</p>
  
  <p><a href="https://i.stack.imgur.com/kOALE.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/kOALE.png" alt="enter image description here"></a></p>
  
  <p>I have did some code and made it like second image.</p>
  
  <p>My Code For Blur is Like</p>
  
  <pre><code>    let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.Dark)
      blurEffectView = UIVisualEffectView(effect: blurEffect)
      blurEffectView.layer.opacity = 0.8
      blurEffectView.alpha = 0.6
      blurEffectView.frame = CGRectMake(0, 42, UIScreen.mainScreen().bounds.width, UIScreen.mainScreen().bounds.height - 42)
      sourceView.addSubview(blurEffectView)
  </code></pre>
  
  <p>Sourceview is my background view. Which I wants to make blur. Any Suggestion ?</p>