How to programmatically set the constraints of the subViews of a UIPageViewController? - swift

Question

I have contained the subViews of a UIPageViewController within a UIView so that my screen has a partial scrollView container. However, the subViewControllers extend beyond both, the UIView that is supposed to contain the (horizontal/swiping page style) scrollView and the screen of the device.
I have already tried to use autolayout constraints but the subViews still go beyond the device screen.
Here is the UIView that contains the subViews of the UIPVC:
let pagingContainer: UIView = {
let view = UIView()
view.backgroundColor = .white
view.translatesAutoresizingMaskIntoConstraints = false
return view
}()
and here is the set up within viewDidLoad():
let pageController = PageViewController(transitionStyle: .scroll, navigationOrientation: .horizontal)
addChild(pageController)
pageController.didMove(toParent: self)
pagingContainer.addSubview(pageController.view)
In case I haven't articulated properly:
What I wish for to happen is that the bottom half of my screen is a horizontal-page-style swiping scrollView that contains x number of subViewControllers (under UIPVC), and the size of subViewControllers are limited to the size of the UIView(pagingContainer).

Answer 1

I think I might understand what you're asking.
It should be pretty simple, set your left/right/top/bottom constraints for the pageController.view to be equal to the pagingContainer
In my example, I'm using SnapKit, so I set the edges equal to superview (which is the paingContainer).
let pageController = PageViewController(transitionStyle: .scroll, navigationOrientation: .horizontal)
self.addChild(pageController)
pageController.didMove(toParent: self)
pagingContainer.addSubview(pageController.view)
// I set up constraints with SnapKit (since I mostly use that pod)
pageController.view.snp.makeConstraints({ (make) in
make.edges.equalToSuperview()
})
// But if I remember correctly, you can also set it like so:
pageController.view.translatesAutoresizingMaskIntoConstraints = false
pageController.view.widthAnchor.constraint(equalTo: self.pagingContainer.widthAnchor).isActive = true
pageController.view.heightAnchor.constraint(equalTo: self.pagingContainer.heightAnchor).isActive = true
pageController.view.centerXAnchor.constraint(equalTo: self.pagingContainer.centerXAnchor).isActive = true
Here is a quick gif of what it looks like. Main view controller only has red background and a pagingContainer on the bottom half and inset of 30 on each side (to demonstrate the size of pageController being within the pagingContainer and not overflowing)