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SwiftUI PageView
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| import SwiftUI | |
| import UIKit | |
| struct PageViewController: UIViewControllerRepresentable { | |
| var controllers: [UIViewController] | |
| @Binding var currentPage: Int | |
| func makeCoordinator() -> Coordinator { | |
| Coordinator(self) | |
| } | |
| func makeUIViewController(context: Context) -> UIPageViewController { | |
| let pageViewController = UIPageViewController( | |
| transitionStyle: .scroll, | |
| navigationOrientation: .horizontal) | |
| pageViewController.dataSource = context.coordinator | |
| pageViewController.delegate = context.coordinator | |
| return pageViewController | |
| } | |
| func updateUIViewController(_ pageViewController: UIPageViewController, context: Context) { | |
| pageViewController.setViewControllers( | |
| [controllers[currentPage]], direction: .forward, animated: true) | |
| } | |
| class Coordinator: NSObject, UIPageViewControllerDataSource, UIPageViewControllerDelegate { | |
| var parent: PageViewController | |
| init(_ pageViewController: PageViewController) { | |
| self.parent = pageViewController | |
| } | |
| func pageViewController( | |
| _ pageViewController: UIPageViewController, | |
| viewControllerBefore viewController: UIViewController) -> UIViewController? | |
| { | |
| guard let index = parent.controllers.firstIndex(of: viewController) else { | |
| return nil | |
| } | |
| if index == 0 { | |
| return nil | |
| } | |
| return parent.controllers[index - 1] | |
| } | |
| func pageViewController( | |
| _ pageViewController: UIPageViewController, | |
| viewControllerAfter viewController: UIViewController) -> UIViewController? | |
| { | |
| guard let index = parent.controllers.firstIndex(of: viewController) else { | |
| return nil | |
| } | |
| if index + 1 == parent.controllers.count { | |
| return nil | |
| } | |
| return parent.controllers[index + 1] | |
| } | |
| func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) { | |
| if completed, | |
| let visibleViewController = pageViewController.viewControllers?.first, | |
| let index = parent.controllers.firstIndex(of: visibleViewController) | |
| { | |
| parent.currentPage = index | |
| } | |
| } | |
| } | |
| } | |
| #if DEBUG | |
| struct PageViewController_Previews: PreviewProvider { | |
| @State static var currentPage = 0 | |
| static var previews: some View { | |
| PageViewController(controllers: [], currentPage: $currentPage) | |
| } | |
| } | |
| #endif | |
| struct PageView<Page: View>: View { | |
| var viewControllers: [UIHostingController<Page>] | |
| @Binding var currentPage: Int | |
| init(_ views: [Page], currentPage: Binding<Int>) { | |
| self._currentPage = currentPage | |
| self.viewControllers = views.map { UIHostingController(rootView: $0) } | |
| } | |
| var body: some View { | |
| PageViewController(controllers: viewControllers, currentPage: $currentPage) | |
| } | |
| } | |
| #if DEBUG | |
| struct PageView_Previews: PreviewProvider { | |
| @State static var page = 0 | |
| static var previews: some View { | |
| PageView([Text("Hello")], currentPage: $page) | |
| } | |
| } | |
| #endif | |
| struct ContentView: View { | |
| @State private var page = 0 | |
| var body: some View { | |
| VStack { | |
| Picker("Page", selection: $page) { | |
| Text("Page 1").tag(0) | |
| Text("Page 2").tag(1) | |
| } | |
| .pickerStyle(SegmentedPickerStyle()) | |
| .padding(EdgeInsets(top: 0, leading: 12, bottom: 0, trailing: 12)) | |
| PageView([ | |
| Text("Page1"), | |
| Text("Page2") | |
| ], currentPage: $page) | |
| } | |
| } | |
| } | |
| struct ContentView_Previews: PreviewProvider { | |
| static var previews: some View { | |
| ContentView() | |
| } | |
| } |
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