swift 3 trigger on container view contents update

Question

I have a view controller containing a container view. This container view is being used to show an UIPageViewController and its various pages. The view containing the container view also contains a navigation bar at the top of the page - which has the Page Control item in it.

This is the arrangement:

When it runs, I can swipe between the green and blue view controllers, and the navigation bar doesn't move. How do I update the Page Control to show which page I am on?

Answer 1

You should use UIPageViewControllerDataSource

func presentationCount(for: UIPageViewController)
func presentationIndex(for: UIPageViewController)