Completely lost on this coordinator stuff.
import SwiftUI
import UIKit
struct PageViewController<Page: View>: UIViewControllerRepresentable {
var pages: [Page]
func makeCoordinator() -> Coordinator {
Coordinator(self)
}
func makeUIViewController(context: Context) -> UIPageViewController {
let pageViewController = UIPageViewController(
transitionStyle: .scroll,
navigationOrientation: .horizontal
)
pageViewController.dataSource = context.coordinator
return pageViewController
}
func updateUIViewController(_ pageViewController: UIPageViewController, context: Context) {
pageViewController.setViewControllers([context.coordinator.controllers[0]], direction: .forward, animated: true)
}
class Coordinator: NSObject, UIPageViewControllerDataSource {
var parent: PageViewController
var controllers = [UIViewController]()
init(_ pageViewController: PageViewController) {
parent = pageViewController
controllers = parent.pages.map { UIHostingController(rootView: $0) }
}
func pageViewController(
_ pageViewController: UIPageViewController,
viewControllerBefore viewController: UIViewController
) -> UIViewController? {
guard let index = controllers.firstIndex(of: viewController) else {
return nil
}
if index == 0 {
return controllers.last
}
return controllers[index - 1]
}
func pageViewController(
_ pageViewController: UIPageViewController,
viewControllerAfter viewController: UIViewController
) -> UIViewController? {
guard let index = controllers.firstIndex(of: viewController) else {
return nil
}
if index + 1 == controllers.count {
return controllers.first
}
return controllers[index + 1]
}
}
}