Awesome

A Swift extension that add a collapsable UINavigationBar when scrolling content.

Usage

In your view controller that contains scrollable content (i.e. a UIScrollView or something that contains one, like a UITableView) implement the UIScrollViewDelegate:

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, UIScrollViewDelegate {

Then, inside your view controller, add this to the end of viewDidLoad::

// Set up the collapsible bar.
self.navigationController?.pvs_collapsibleBar()

Then implement the following UIScrollViewDelegate method like so:

//#pragma - mark UIScrollViewDelegate

func scrollViewDidScroll(scrollView: UIScrollView) {
    self.navigationController?.pvs_collapisbleBarScrollViewDidScroll(scrollView)
}

That's it! If needed, play with the globals inside PVSCollapsibleBarNavigationController to change the speed of the collapse and the title size.