override func viewDidLoad() {
  super.viewDidLoad()

  let onboarding = PaperOnboarding(itemsCount: 3)
  onboarding.dataSource = self
  onboarding.translatesAutoresizingMaskIntoConstraints = false
  view.addSubview(onboarding)

  // add constraints
  for attribute: NSLayoutAttribute in [.Left, .Right, .Top, .Bottom] {
    let constraint = NSLayoutConstraint(item: onboarding,
                                        attribute: attribute,
                                        relatedBy: .Equal,
                                        toItem: view,
                                        attribute: attribute,
                                        multiplier: 1,
                                        constant: 0)
    view.addConstraint(constraint)
  }
}

func onboardingItemAtIndex(index: Int) -> OnboardingItemInfo {
   return [
     ("BIG_IMAGE1", "Title", "Description text", "IconName1", "BackgroundColor", textColor, DescriptionColor, textFont, DescriptionFont),
     ("BIG_IMAGE1", "Title", "Description text", "IconName1", "BackgroundColor", textColor, DescriptionColor, textFont, DescriptionFont),
     ("BIG_IMAGE1", "Title", "Description text", "IconName1", "BackgroundColor", textColor, DescriptionColor, textFont, DescriptionFont)
   ][index]
 }

 func onboardingItemsCount() -> Int {
    return 3
  }

func onboardingConfigurationItem(item: OnboardingContentViewItem, index: Int) {

//    item.titleLabel?.backgroundColor = .redColor()
//    item.descriptionLabel?.backgroundColor = .redColor()
//    item.imageView = ...
  }