我想在我的 SwiftUI 应用程序中使用 UIPageViewController，如本教程所示。但是，本教程传递与页面相同的视图类型，我想传递任何类型的视图。
struct PageViewController<Page: View>: UIViewControllerRepresentable {
var pages: [Page]
@Binding var currentPage: Int
func makeCoordinator() -> Coordinator {
Coordinator(self)
}
func makeUIViewController(context: Context) -> UIPageViewController {
let pageViewController = UIPageViewController(
transitionStyle: .scroll,
navigationOrientation: .horizontal)
pageViewController.delegate = context.coordinator
return pageViewController
}
func updateUIViewController(_ pageViewController: UIPageViewController, context: Context) {
pageViewController.setViewControllers(
[context.coordinator.controllers[currentPage]], direction: .forward, animated: true)
}
class Coordinator: NSObject, UIPageViewControllerDelegate {
var parent: PageViewController
var controllers = [UIViewController]()
init(_ pageViewController: PageViewController) {
parent = pageViewController
controllers = parent.pages.map { UIHostingController(rootView: $0) }
}
func pageViewController(
_ pageViewController: UIPageViewController,
didFinishAnimating finished: Bool,
previousViewControllers: [UIViewController],
transitionCompleted completed: Bool) {
if completed,
let visibleViewController = pageViewController.viewControllers?.first,
let index = controllers.firstIndex(of: visibleViewController) {
parent.currentPage = index
}
}
}
}
struct PageView<Page: View>: View {
var pages: [Page]
@State var currentPage = 0
var body: some View {
ZStack {
PageViewController(pages: pages, currentPage: $currentPage)
}
}
}
struct PageView_Previews: PreviewProvider {
static var previews: some View {
PageView(pages: [
Color.red,
Color.blue
// I want to add other view types here
])
}
}
如果我将 PageView_Previews 中的页面数组更改为 [Color.red, Text("abc")] 之类的内容，则会收到错误消息，因为它们的类型不同。如何让 SwiftUI 在这里允许异构视图类型？
我不能将 TabView 与 PageTabViewStyle 一起使用（很多错误），所以这就是我需要使用这个 UIKit 方法的原因。