@IBOutlet weak var scrollingFollowView: ScrollingFollowView!

// NSLayoutConstraint of moving edge.
@IBOutlet weak var constraint: NSLayoutConstraint!

override func viewDidLoad() {
    super.viewDidLoad()

    let scrollingFollowViewHeight = scrollingFollowView.frame.size.height
    let statusBarHeight = UIApplication.sharedApplication().statusBarFrame.size.height

    // First setup
    // In default use, maxFollowPoint should be maxPoint of following to scroll DOWN.
    // In default use, minFollowPoint should be maxPoint of following to scroll UP.
    scrollingFollowView.setup(constraint: constraint, maxFollowPoint: scrollingFollowViewHeight + statusBarHeight, minFollowPoint: 0)
}

func scrollViewDidScroll(scrollView: UIScrollView) {
	// scrollingFollowView follows UIScrollView scrolling.
    scrollingFollowView.didScroll(scrollView)
}

// show
@IBAction func showButton() {
	scrollingFollowView.show(true)
	scrollingFollowView.resetPreviousPoint(scrollView)
}
// hide
@IBAction func hideButton() {
	scrollingFollowView.hide(false)
	scrollingFollowView.resetPreviousPoint(scrollView)
}

func show(animated: Bool, duration: Double = 0.2, completionHandler: (()->())? = nil)
func hide(animated: Bool, duration: Double = 0.2, completionHandler: (()->())? = nil)

// show
@IBAction func showButton() {
	scrollingFollowView.show(true, duration: 0.6) { print("showed") }
	scrollingFollowView.resetPreviousPoint(scrollView)
}
// hide
@IBAction func hideButton() {
	scrollingFollowView.hide(true, duration: 0.5) { print("hid") }
	scrollingFollowView.resetPreviousPoint(scrollView)
}

override func viewDidLoad() {
    super.viewDidLoad()

    let scrollingFollowViewHeight = scrollingFollowView.frame.size.height
    let statusBarHeight = UIApplication.sharedApplication().statusBarFrame.size.height

    scrollingFollowView.setup(constraint: constraint, maxFollowPoint: scrollingFollowViewHeight + statusBarHeight, minFollowPoint: 0)

    scrollingFollowView.setupDelayPoints(pointOfStartingHiding: 100, pointOfStartingShowing: 50)
}

override func viewDidLoad() {
    super.viewDidLoad()

    let scrollingFollowViewHeight = scrollingFollowView.frame.size.height
    let statusBarHeight = UIApplication.sharedApplication().statusBarFrame.size.height

    // allowHalfDisplay: Default is false.
    // When allowHalfDisplay is true, ScrollingFollowView can display following scrolling state.
    // When allowHalfDisplay is false, ScrollingFollowView can't display following scrolling state. (If ScrollingFollowView is half-display state, it automatically animates.)
    scrollingFollowView.setup(constraint: constraint, maxFollowPoint: scrollingFollowViewHeight + statusBarHeight, minFollowPoint: 0, allowHalfDisplay: true)
}

extension ViewController: UIScrollViewDelegate {
    func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
        navBarScrollingFollowView.didEndScrolling()
    }
    
    func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
        navBarScrollingFollowView.didEndScrolling(decelerate)
    }
}