This is the example code used in the iOS 8 visual effects crash course written by Tammy Coron. Read it here: http://www.binpress.com/tutorial/a-primer-on-ios-8-visual-effects/159
This tutorial will give you a crash course on giving your iOS 8 apps some added polish with UIBlurEffect, UIVibrancyEffect and UIVisualEffectView. The app we'll be building to walk through these visual effects pays homage to one of my favorite creative professionals, Tim Burton.