SwiftUI - Nested links within NavigationStack inside a NavigationSplitView not working - swift

Question

I'm playing around with the new navigation API's offered in ipadOS16/macOS13, but having some trouble working out how to combine NavigationSplitView, NavigationStack and NavigationLink together on macOS 13 (Testing on a Macbook Pro M1). The same code does work properly on ipadOS.
I'm using a two-column NavigationSplitView. Within the 'detail' section I have a list of SampleModel1 instances wrapped in a NavigationStack. On the List I've applied navigationDestination's for both SampleModel1 and SampleModel2 instances.
When I select a SampleModel1 instance from the list, I navigate to a detailed view that itself contains a list of SampleModel2 instances. My intention is to navigate further into the NavigationStack when clicking on one of the SampleModel2 instances but unfortunately this doesn't seem to work. The SampleModel2 instances are selectable but no navigation is happening.
When I remove the NavigationSplitView completely, and only use the NavigationStack the problem does not arise, and i can successfully navigate to the SampleModel2 instances.
Here's my sample code:
// Sample model definitions used to trigger navigation with navigationDestination API.
struct SampleModel1: Hashable, Identifiable {
let id = UUID()
static let samples = [SampleModel1(), SampleModel1(), SampleModel1()]
}
struct SampleModel2: Hashable, Identifiable {
let id = UUID()
static let samples = [SampleModel2(), SampleModel2(), SampleModel2()]
}
// The initial view loaded by the app. This will initialize the NavigationSplitView
struct ContentView: View {
enum NavItem {
case first
}
var body: some View {
NavigationSplitView {
NavigationLink(value: NavItem.first) {
Label("First", systemImage: "house")
}
} detail: {
SampleListView()
}
}
}
// A list of SampleModel1 instances wrapped in a NavigationStack with multiple navigationDestinations
struct SampleListView: View {
#State var path = NavigationPath()
#State var selection: SampleModel1.ID? = nil
var body: some View {
NavigationStack(path: $path) {
List(SampleModel1.samples, selection: $selection) { model in
NavigationLink("\(model.id)", value: model)
}
.navigationDestination(for: SampleModel1.self) { model in
SampleDetailView(model: model)
}
.navigationDestination(for: SampleModel2.self) { model in
Text("Model 2 ID \(model.id)")
}
}
}
}
// A detailed view of a single SampleModel1 instance. This includes a list
// of SampleModel2 instances that we would like to be able to navigate to
struct SampleDetailView: View {
var model: SampleModel1
var body: some View {
Text("Model 1 ID \(model.id)")
List (SampleModel2.samples) { model2 in
NavigationLink("\(model2.id)", value: model2)
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}

Answer 1

I removed this unclear ZStack and all works fine. Xcode 14b3 / iOS 16
// ZStack { // << this !!
SampleListView()
// }

Answer 2

Apple just releases macos13 beta 5 and they claimed this was resolved through feedback assistant, but unfortunately this doesn't seem to be the case.
I cross-posted this question on the apple developers forum and user nkalvi posted a workaround for this issue. I’ll post his example code here for future reference.
import SwiftUI
// Sample model definitions used to trigger navigation with navigationDestination API.
struct SampleModel1: Hashable, Identifiable {
let id = UUID()
static let samples = [SampleModel1(), SampleModel1(), SampleModel1()]
}
struct SampleModel2: Hashable, Identifiable {
let id = UUID()
static let samples = [SampleModel2(), SampleModel2(), SampleModel2()]
}
// The initial view loaded by the app. This will initialize the NavigationSplitView
struct ContentView: View {
#State var path = NavigationPath()
enum NavItem: Hashable, Equatable {
case first
}
var body: some View {
NavigationSplitView {
List {
NavigationLink(value: NavItem.first) {
Label("First", systemImage: "house")
}
}
} detail: {
SampleListView(path: $path)
}
}
}
// A list of SampleModel1 instances wrapped in a NavigationStack with multiple navigationDestinations
struct SampleListView: View {
// Get the selection from DetailView and append to path
// via .onChange
#State var selection2: SampleModel2? = nil
#Binding var path: NavigationPath
var body: some View {
NavigationStack(path: $path) {
VStack {
Text("Path: \(path.count)")
.padding()
List(SampleModel1.samples) { model in
NavigationLink("Model1: \(model.id)", value: model)
}
.navigationDestination(for: SampleModel2.self) { model in
Text("Model 2 ID \(model.id)")
.navigationTitle("navigationDestination(for: SampleModel2.self)")
}
.navigationDestination(for: SampleModel1.self) { model in
SampleDetailView(model: model, path: $path, selection2: $selection2)
.navigationTitle("navigationDestination(for: SampleModel1.self)")
}
.navigationTitle("First")
}
.onChange(of: selection2) { newValue in
path.append(newValue!)
}
}
}
}
// A detailed view of a single SampleModel1 instance. This includes a list
// of SampleModel2 instances that we would like to be able to navigate to
struct SampleDetailView: View {
var model: SampleModel1
#Binding var path: NavigationPath
#Binding var selection2: SampleModel2?
var body: some View {
NavigationStack {
Text("Path: \(path.count)")
.padding()
List(SampleModel2.samples, selection: $selection2) { model2 in
NavigationLink("Model2: \(model2.id)", value: model2)
// This also works (without .onChange):
// Button(model2.id.uuidString) {
// path.append(model2)
// }
}
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}