UIBarButtonItem not showing under horizontal scrolling - ios

Question

I followed this tutorial, specifically under "Paging with UIScrollView" section to create horizontal scrolling. Currently, I have it set up so that the images cover the entire frame/screen.
I am trying to add a simple UIBarButtonItem on the navigation bar (using Storyboard) in an attempt to build a slide-out menu. However, the button does not show up. Also, the navigation bar does not show up either even when I tried self.navigationController?.navigationBarHidden = false.
My current view controller is written like so.
class HomeViewController: UIViewController, UIScrollViewDelegate {
#IBOutlet weak var pagedScrollView: UIScrollView!
#IBOutlet weak var pageControl: UIPageControl!
#IBOutlet weak var hamburger: UIBarButtonItem! // the button
var pageImages: [UIImage] = []
var pageViews: [UIImageView?] = []
override func viewDidLoad() {
super.viewDidLoad()
self.navigationController?.toolbarHidden = false
hamburger.target = self.revealViewController()
hamburger.action = Selector("revealToggle:")
}
override func prefersStatusBarHidden() -> Bool {
return true
}
override func viewDidAppear(animated: Bool) {
let weatherData = WeatherDataLibrary().library
pageImages = [
UIImage(named: weatherData[0]["image"] as! String!)!,
UIImage(named: weatherData[1]["image"] as! String!)!,
UIImage(named: weatherData[2]["image"] as! String!)!,
UIImage(named: weatherData[3]["image"] as! String!)!,
UIImage(named: weatherData[4]["image"] as! String!)!,
UIImage(named: weatherData[5]["image"] as! String!)!,
]
let pageCount = weatherData.count
pageControl.currentPage = 0
pageControl.numberOfPages = pageCount
for _ in 0..<pageCount {
pageViews.append(nil)
}
let pagesScrollViewSize = pagedScrollView.frame.size
pagedScrollView.contentSize = CGSize(width: pagesScrollViewSize.width * CGFloat(pageImages.count),
height: pagesScrollViewSize.height)
loadVisiblePages()
}
func loadPage(page: Int) {
if page < 0 || page >= pageImages.count {
// If it's outside the range of what you have to display, then do nothing
return
}
// 1
if let pageView = pageViews[page] {
// Do nothing. The view is already loaded.
} else {
// 2
var frame = pagedScrollView.bounds
frame.origin.x = frame.size.width * CGFloat(page)
frame.origin.y = 0.0
// 3
let newPageView = UIImageView(image: pageImages[page])
newPageView.contentMode = .ScaleToFill
newPageView.frame = frame
pagedScrollView.addSubview(newPageView)
// 4
pageViews[page] = newPageView
}
}
func purgePage(page: Int) {
if page < 0 || page >= pageImages.count {
// If it's outside the range of what you have to display, then do nothing
return
}
// Remove a page from the scroll view and reset the container array
if let pageView = pageViews[page] {
pageView.removeFromSuperview()
pageViews[page] = nil
}
}
func loadVisiblePages() {
// First, determine which page is currently visible
let pageWidth = pagedScrollView.frame.size.width
let numberOfImages = pageImages.count
let page = Int(floor((pagedScrollView.contentOffset.x * CGFloat(numberOfImages) + pageWidth) / (pageWidth * CGFloat(numberOfImages))))
// Update the page control
pageControl.currentPage = page
// Work out which pages you want to load
let firstPage = 0
let lastPage = numberOfImages
// Purge anything before the first page
for var index = 0; index < firstPage; ++index {
purgePage(index)
}
// Load pages in our range
for index in firstPage...lastPage {
loadPage(index)
}
// Purge anything after the last page
for var index = lastPage+1; index < pageImages.count; ++index {
purgePage(index)
}
}
func scrollViewDidScroll(pagedScrollView: UIScrollView!) {
// Load the pages that are now on screen
loadVisiblePages()
}

Answer 1

The code looks fine. Your problem is likely in your storyboard. Maybe the navigation controller isn't properly linked to your View Controller.
Did you attached the nav controller to the VC using Editor > Embed In > Navigation Controller? From the top menu.