I am implementing a straightforward gallery view controller where the app displays a small range of full-screen images that the user can scroll through. I'm using UIPageViewController which I thought, should display the Page Control indicators automatically if I implement the correct datasource functions. However I still cannot see any indicators.
In my main GalleryViewController:
class GalleryViewController: UIViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate {
var pageController: UIPageViewController?
var pageContent = NSArray()
override func viewDidLoad() {
super.viewDidLoad()
.... some code to load images into the pageContent array ....
pageController = UIPageViewController(transitionStyle:.Scroll, navigationOrientation:.Horizontal,options:nil)
pageController?.delegate = self
pageController?.dataSource = self
... some more standard code to add the page controller to self.view etc.
var pageControl = UIPageControl.appearance()
pageControl.pageIndicatorTintColor = UIColor.lightGray()
pageControl.currentPageIndicatorTintColor = UIColor.whiteColor()
pageControl.backgroundColor = UIColor.blackColor()
pageController!.didMoveToParentViewController(self)
}
func viewControllerAtIndex(index:Int) -> ContentViewController? {
....
}
I have implemented the two compulsory protocol methods viewControllerBeforeViewController and viewControllerAfterController as well as the two required ones for paging, presentationCountForPagesViewController and presentationIndexForPageViewController.
My ContentViewController has a UIImageView that fills the entire screen. However even when I decrease its size off the bottom of the screen, I cannot see any page indicator lights.
Have I missed something here? Let me know if I have not provided enough information. I've been trying to rewrite an old app of mine that I coded in Objective-C over 5 years ago - entirely in Swift for iOS8 and Xcode etc. has changed so much, it is confusing.
Thanks!
Taken from here :
In order to show UIPageControl, you need to implement two optional datasource methods. Just return the whole number of pages for presentationCountForPageViewController and the initially selected index for presentationIndexForPageViewController
func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int {
return pageContent.count
}
func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int {
return 0
}