Here is the code using an ObservedObject.
import SwiftUI
import OSLog
final class NavigationModel: ObservableObject {
@Published var path = NavigationPath() {
didSet {
print("navigationModel.path.count: \(path.count)")
}
}
}
class Report: ObservableObject {
@Published var title: String
@Published var photo: UIImage?
init(title: String, photo: UIImage? = UIImage(systemName: "z.circle")) {
self.title = title
self.photo = photo
}
}
private let logger = Logger()
struct ViewType: Identifiable, Hashable {
let id: String
}
private var viewTypes = [
ViewType(id: "First View"),
]
struct ContentView: View {
@StateObject private var navigationModel = NavigationModel()
@State var selection: Set<String> = [viewTypes[0].id]
@StateObject var report = Report(title: "ContentView Report")
var body: some View {
NavigationSplitView {
List(viewTypes, selection: $selection) { viewType in
Text("\(viewType.id)")
}
} detail: {
if let viewTitle = selection.first {
switch viewTitle {
case "First View":
FirstView(report: report)
default:
Text("Invalid View")
}
}
}
.environmentObject(navigationModel)
}
}
// FirstView
struct FirstView: View {
@EnvironmentObject var navigationModel: NavigationModel
@ObservedObject var report: Report
private enum NavigationLinkValueFirstView {
case secondView
}
var body: some View {
NavigationStack(path: $navigationModel.path) {
NavigationLink(value: NavigationLinkValueFirstView.secondView) {
let _ = logger.debug("FirstView NavigationLink")
Text("Push Second View")
}
.navigationDestination(for: NavigationLinkValueFirstView.self) { value in
let _ = logger.debug("FirstView navigationDestination")
SecondView(report: report)
}
}
.navigationTitle("First View")
}
}
// SecondView
struct SecondView: View {
@State var showTheView = false
@ObservedObject var report: Report
private enum NavigationLinkValueSecondView {
case firstView
}
var body: some View {
NavigationLink(value: NavigationLinkValueSecondView.firstView) {
let _ = logger.debug("SecondView NavigationLink")
Text("Push New/Different Instantiation of First View")
}
.navigationDestination(for: NavigationLinkValueSecondView.self) { value in
FirstView(report: report)
let _ = logger.debug("SecondView navigationDestination")
}
.navigationTitle("Second View")
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
