How do I Disable the swipe gesture of UIPageViewController?

Question

The documented way to prevent the UIPageViewController from scrolling is to not assign the dataSource property. If you assign the data source it will move into 'gesture-based' navigation mode which is what you're trying to prevent.

Without a data source you manually provide view controllers when you want to with setViewControllers:direction:animated:completion method and it will move between view controllers on demand.

The above can be deduced from Apple's documentation of UIPageViewController (Overview, second paragraph):

To support gesture-based navigation, you must provide your view controllers using a data source object.

for (UIScrollView *view in self.pageViewController.view.subviews) {

    if ([view isKindOfClass:[UIScrollView class]]) {

        view.scrollEnabled = NO;
    }
}

I translate answer of user2159978 to Swift 5.1

func removeSwipeGesture(){
    for view in self.pageViewController!.view.subviews {
        if let subView = view as? UIScrollView {
            subView.isScrollEnabled = false
        }
    }
}

Implementing @lee's (@user2159978's) solution as an extension:

extension UIPageViewController {
    var isPagingEnabled: Bool {
        get {
            var isEnabled: Bool = true
            for view in view.subviews {
                if let subView = view as? UIScrollView {
                    isEnabled = subView.isScrollEnabled
                }
            }
            return isEnabled
        }
        set {
            for view in view.subviews {
                if let subView = view as? UIScrollView {
                    subView.isScrollEnabled = newValue
                }
            }
        }
    }
}

Usage: (in UIPageViewController)

self.isPagingEnabled = false

I've been fighting this for a while now and thought I should post my solution, following on from Jessedc's answer; removing the PageViewController's datasource.

I added this to my PgeViewController class (linked to my page view controller in the storyboard, inherits both UIPageViewController and UIPageViewControllerDataSource):

static func enable(enable: Bool){
    let appDelegate  = UIApplication.sharedApplication().delegate as! AppDelegate
    let pageViewController = appDelegate.window!.rootViewController as! PgeViewController
    if (enable){
        pageViewController.dataSource = pageViewController
    }else{
        pageViewController.dataSource = nil
    }
}

This can then be called when each sub view appears (in this case to disable it);

override func viewDidAppear(animated: Bool) {
    PgeViewController.enable(false)
}

I hope this helps someone out, its not as clean as I would like it but doesn't feel too hacky etc.

EDIT: If someone wants to translate this into Objective-C please do :)