Are my pageviewcontroller gestures being intercepted?

Question

I have followed a pageviewcontroller tutorial to create an image slider. I have then adapted it to insert into a tableviewcell as I want an image slider within the table.

I like the idea of using this same code in full screen or embedded into another view.

However, when I do this, the pageviewafter and pageviewbefore events dont fire when sliding. I suspect the tableviewcontroller or cell are gobbling up the events so the pageviewcontroller isnt receiving them.

Im a part time ios developer at best, so looking for any suggestions I can check out/overcome my problem.

Some code detail as requested. I am adding my PageViewController after a callback of retreiving the images completes. plantPhotoContainerView is a UIView inside a static cell which was added with the storyboard.

self.plantPhotoContainerView.addSubview(vc.view)

The pageviewcontroller sets the delegate to itself and I'm currently ignoring the images passed in the controller and just using some test images:

class ImageSliderViewController: UIPageViewController, UIPageViewControllerDataSource {
    init(images: [String]) {
        super.init(transitionStyle: UIPageViewController.TransitionStyle.scroll, navigationOrientation: UIPageViewController.NavigationOrientation.horizontal, options: nil)
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    var images = ["Growers", "Home", "Media"]

    override func viewDidLoad() {
        super.viewDidLoad()

        dataSource = self

        view.backgroundColor = UIColor.yellow

        let imageViewController = ImageViewController()
        imageViewController.imageName = images.first
        let viewControllers = [imageViewController]

        setViewControllers(viewControllers, direction: .forward, animated: true, completion: nil)
    }

    override func viewDidLayoutSubviews() {
        self.view.translatesAutoresizingMaskIntoConstraints = false
        view.leftAnchor.constraint(equalTo: view.superview!.leftAnchor).isActive = true
        view.rightAnchor.constraint(equalTo: view.superview!.rightAnchor).isActive = true
        view.topAnchor.constraint(equalTo: view.superview!.topAnchor).isActive = true
        view.bottomAnchor.constraint(equalTo: view.superview!.bottomAnchor).isActive = true
    }

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
        let currentImageName = (viewController as! ImageViewController).imageName!
        let currentIndex = images.firstIndex(of: currentImageName)!

        if currentIndex < images.count - 1 {
            let imageViewController = ImageViewController()
            imageViewController.imageName = images[currentIndex + 1]

            return imageViewController
        }

        return nil
    }

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
        let currentImageName = (viewController as! ImageViewController).imageName!
        let currentIndex = images.firstIndex(of: currentImageName)!

        if currentIndex > 0 {
            let imageViewController = ImageViewController()
            imageViewController.imageName = images[currentIndex - 1]

            return imageViewController
        }

        return nil
    }
}

Answer 1

Ok, I eventually found a post which helped. When adding a subview, two extra lines are required for the default gesture functionality to be passed on through to the pageviewcontroller. Hope this helps others.

self.addChild(vc)
self.plantPhotoContainerView.addSubview(vc.view)
vc.didMove(toParent: self)

To be honest, I don't full understand what this does, maybe someone better versed in the swift framework could elaborate.