import BONavigationPullToRefresh

class ExampleViewController: UIViewController, NavigationPullRefreshable {
  let fakeLoadingTime = dispatch_time(DISPATCH_TIME_NOW, Int64(4 * NSEC_PER_SEC))
  @IBOutlet weak var scrollView: UIScrollView!

  override func viewDidLoad() {
    super.viewDidLoad()

    // Maximum height for the loading view
    let maxHeight: CGFloat = self.navigationController?.navigationBar.absoluteHeight ?? 10

    // Configurations to animate the default RefreshableView
    let configurations = DefaultRefreshingViewConfigurations(maxHeight: maxHeight,
                                                             image: UIImage(named: "sample"))

    let refreshableView = DefaultRefreshingView(configurations: configurations)


    addNavigationPullToRefresh(toScrollView: self.scrollView, refreshingView: refreshableView) {
      let fakeLoadingTime = dispatch_time(DISPATCH_TIME_NOW, Int64(10 * NSEC_PER_SEC))
      dispatch_after(fakeLoadingTime, dispatch_get_main_queue()) {
        self.endRefreshing()
      }
    }
  }
}

public protocol RefreshableView {
  // View will start refreshing
  func startRefreshing()

  // Loading has beed canceled due to ViewController disapear
  func cancelRefreshing()

  // Loading has finished successfully
  func endRefreshing()

  // View needs to be updated to the percentage of loading given (bettween 0 - 1)
  func updateLoadingItem(percentage: CGFloat)
}

  // configurations is a DefaultRefreshingViewConfigurations
  DefaultRefreshingView(configurations: configurations)

public struct DefaultRefreshingViewConfigurations {

// Maximum view Size
var maxHeight: CGFloat = 80

  // View inset
  var inset = CGPoint.zero

  // Image to be shown
  var image: UIImage?

  // Scaling option of the UIImageView
  var imageOptions = UIViewContentMode.ScaleToFill

  // Animation time
  var animationTime: NSTimeInterval = 1

  // Fade animation Time
  var animationFadeTime: NSTimeInterval = 0.5
}

self.endRefreshing()

override func viewWillAppear(animated: Bool) {
  super.viewWillAppear(animated)
  viewControllerWillShow()
}

override func viewDidAppear(animated: Bool) {
  super.viewDidAppear(animated)
  viewControllerDidShow()
}

override func viewWillDisappear(animated: Bool) {
  super.viewWillDisappear(animated)
  viewControllerWillDisappear()
}

public protocol NavigationPullRefreshable {
  // Configure the NavigationPullToRefresh
  func addNavigationPullToRefresh(toScrollView scrollView: UIScrollView,
                                               refreshingView: RefreshableView,
                                               startLoading: () -> Void)

  // You must call when the ViewController appears to pause loader when viewController is pushed
  func viewControllerWillShow()

  // You must call when the ViewController didAppear to set the refreshable view below the title
  func viewControllerDidShow()

  // You must call when the ViewController will disappear to pause loader when viewController is popped
  // or pushed
  func viewControllerWillDisappear()

  func endRefreshing()
}

  // Distance needed to trigger refresh
  public var triggerDistance: CGFloat = 80