SwiftUI 4: NavigationSplitView behaves strangely? - swiftui

Question

In SwiftUI 4, there is now a NavigationSplitView. I played around with it and detected some strange behaviour.
Consider the following code: When the content function returns the plain Text, then there is the expected behaviour - tapping a menu item changes the detail view to the related text.
However, when commenting out the first four cases, and commenting in the next four, then a tap on "Edit Profile" does not change the detail view display. (Using #ViewBuilder does not change this behaviour.)
Any ideas out there about the reasons for that? From my point of view, this may just be a simple bug, but perhaps there are things to be considered that are not documented yet?!
struct MainScreen: View {
#State private var menuItems = MenuItem.menuItems
#State private var menuItemSelection: MenuItem?
var body: some View {
NavigationSplitView {
List(menuItems, selection: $menuItemSelection) { course in
Text(course.name).tag(course)
}
.navigationTitle("HappyFreelancer")
} detail: {
content(menuItemSelection)
}
.navigationSplitViewStyle(.balanced)
}
func content(_ selection: MenuItem?) -> some View {
switch selection {
case .editProfile:
return Text("Edit Profile")
case .evaluateProfile:
return Text("Evaluate Profile")
case .setupApplication:
return Text("Setup Application")
case .none:
return Text("none")
// case .editProfile:
// return AnyView(EditProfileScreen())
//
// case .evaluateProfile:
// return AnyView(Text("Evaluate Profile"))
//
// case .setupApplication:
// return AnyView(Text("Setup Application"))
//
// case .none:
// return AnyView(Text("none"))
}
}
}
struct MainScreen_Previews: PreviewProvider {
static var previews: some View {
MainScreen()
}
}
enum MenuItem: Int, Identifiable, Hashable, CaseIterable {
var id: Int { rawValue }
case editProfile
case evaluateProfile
case setupApplication
var name: String {
switch self {
case .editProfile: return "Edit Profile"
case .evaluateProfile: return "Evaluate Profile"
case .setupApplication: return "Setup Application"
}
}
}
extension MenuItem {
static var menuItems: [MenuItem] {
MenuItem.allCases
}
}
struct EditProfileScreen: View {
var body: some View {
Text("Edit Profile")
}
}

Answer 1

After playing around a bit in order to force SwiftUI to redraw the details view, I succeeded in this workaround:
Wrap the NavigationSplitView into a GeometryReader.
Apply an .id(id) modifier to the GeometryReader (e.g., as #State private var id: Int = 0)
In this case, any menu item selection leads to a redraw as expected.
However, Apple should fix the bug, which it is obviously.

Answer 2

I've found that wrapping the Sidebar list within its own view will fix this issue:
struct MainView: View {
#State var selection: SidebarItem? = .none
var body: some View {
NavigationSplitView {
Sidebar(selection: $selection)
} content: {
content(for: selection)
} detail: {
Text("Detail")
}
}
#ViewBuilder
func content(for item: SidebarItem?) -> some View {
switch item {
case .none:
Text("Select an Item in the Sidebar")
case .a:
Text("A")
case .b:
Text("B")
}
}
}