Swift Question
How do I navigate forward and backward within UIPageViewController using buttons?
I'm creating an onboarding app for New Patients of a physical therapy clinic. The new patient will answer questions on each view controller within the
UIPageViewControllerI followed a tutorial and set up my
UIPageViewControllerPageVCPageVCPageVCI like using
UIPageViewControllerUIPageViewControllerclass PageVC: UIPageViewController, UIPageViewControllerDataSource {
private(set) lazy var orderedViewControllers: [UIViewController] = {
return [self.VCInstance(name: "BodyChart"),
self.VCInstance(name: "Symptoms"),
self.VCInstance(name: "HadSurgery")]
}()
private func VCInstance(name: String) -> UIViewController {
return UIStoryboard(name: "Main", bundle: nil) .
instantiateViewController(withIdentifier: name)
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
guard let viewControllerIndex = orderedViewControllers.index(of: viewController) else {
return nil
}
let previousIndex = viewControllerIndex - 1
guard previousIndex >= 0 else {
return nil
}
guard orderedViewControllers.count > previousIndex else {
return nil
}
return orderedViewControllers[previousIndex]
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
guard let viewControllerIndex = orderedViewControllers.index(of: viewController) else {
return nil
}
let nextIndex = viewControllerIndex + 1
let orderedViewControllersCount = orderedViewControllers.count
guard orderedViewControllersCount != nextIndex else {
return nil
}
guard orderedViewControllersCount > nextIndex else {
return nil
}
return orderedViewControllers[nextIndex]
}
override func viewDidLoad() {
super.viewDidLoad()
dataSource = self
if let firstViewController = orderedViewControllers.first {
setViewControllers([firstViewController], direction: .forward, animated: true, completion: nil)
}
}
}
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Answer Source
I think what you're looking for is here. But this is another way.
UIPageViewController has an instance method transition. The snippet below will move from the first to the second page child view controller.
pageViewController.transition(from: pageViewController.viewControllers[0], to: pageViewController.viewControllers[1], duration: 0.3, options: UIViewAnimationOptions.curveEaseInOut, animations: nil, completion: nil)
PageVC currently changes pages by swiping, but I want to be able to navigate backward and forward through view controllers using two buttons
Add your buttons to page content, then disable horizontal scrolling on PageVC's scrollview or disable views' user interaction in a mannered fashion.
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