Calling swiftUI View from UIKIt and pass data with or without userdefaults - swift

Question

I have been trying to call SwiftUI view from UIViewController but i dont know the right way to do it.
I have trying using use Userdefaults but SwiftUI view complains that URL passed via userdefaults is nil
this is the view
import SwiftUI
import QuickLook
import UIKit
struct PreviewController: UIViewControllerRepresentable {
let url: URL
var error: Binding<Bool>
func makeUIViewController(context: Context) -> QLPreviewController {
let controller = QLPreviewController()
controller.dataSource = context.coordinator
controller.isEditing = false
return controller
}
func makeCoordinator() -> Coordinator {
return Coordinator(parent: self)
}
func updateUIViewController(
_ uiViewController: QLPreviewController, context: Context) {}
class Coordinator: QLPreviewControllerDataSource {
var parent: PreviewController
init(parent: PreviewController) {
self.parent = parent
}
func numberOfPreviewItems(
in controller: QLPreviewController
) -> Int {
return 1
}
func previewController(
_ controller: QLPreviewController, previewItemAt index: Int
) -> QLPreviewItem {
guard self.parent.url.startAccessingSecurityScopedResource()
else {
return NSURL(fileURLWithPath: parent.url.path)
}
defer {
self.parent.url.stopAccessingSecurityScopedResource()
}
return NSURL(fileURLWithPath: self.parent.url.path)
}
}
}
struct ProjectDocumentOpener: View {
#Binding var open: Bool
#State var errorInAccess = false
var body: some View {
NavigationView {
VStack(alignment: .center, spacing: 0) {
let url = URL(string: UserDefaults.standard.string(forKey: "documentLink")!)
PreviewController(url: url!, error: $errorInAccess)
}
}
.navigationBarTitleDisplayMode(.inline)
.navigationBarTitle(
Text(URL(string: UserDefaults.standard.string(forKey: "documentLink")!)?.lastPathComponent ?? "")
)
.toolbar {
ToolbarItem(placement: .navigationBarLeading) {
Button("Done") {
self.open = false
}
}
}
}
}
This is how i have been calling it in UIViewController
UserDefaults.standard.set(docURL, forKey: "documentLink")
self.navigationController?.pushViewController(UIHostingController(rootView: ProjectDocumentOpener(open: .constant(true))), animated: true)
I tried to google and find a proper resource which explains how to use a SwiftUI view with UIViewController but cant find any resource suitable for my needs.