title: Where do I put common utility functions in iOS 8 + Swift
body: <p>I have the following method (for instance) that I'd like to be able to use from any ViewController in an iOS + Swift project:</p>
  
  <pre><code>func initializeBlurEffectOnGivenUIView(UIViewToBeBlurred: UIView) {
  
      let UIViewToBeBlurredHeight = UIViewToBeBlurred.frame.size.height
      let UIViewToBeBlurredWidth = UIViewToBeBlurred.frame.size.width
      let UIViewToBeBlurredX = UIViewToBeBlurred.frame.origin.x
      let UIViewToBeBlurredY = UIViewToBeBlurred.frame.origin.y
  
      let blurEffect:UIBlurEffect = UIBlurEffect(style: UIBlurEffectStyle.Light)
      let vibrancyEffect = UIVibrancyEffect(forBlurEffect: blurEffect)
  
      let vibrancyEffectView = UIVisualEffectView(effect: vibrancyEffect)
      let blurEffectView:UIVisualEffectView = UIVisualEffectView(effect: blurEffect)
      blurEffectView.frame = CGRectMake(UIViewToBeBlurredX, UIViewToBeBlurredY, UIViewToBeBlurredWidth, UIViewToBeBlurredHeight)
      blurEffectView.contentView.addSubview(vibrancyEffectView)
  
      UIViewToBeBlurred.addSubview(blurEffectView)
  }
  </code></pre>
  
  <p>I have more common helpers such as there that I'd like to make available as well. How do I structure the application to achieve this?</p>