What toolbar feature do you need?
|
+- User-customizable toolbar (add/remove/reorder items)
|  +- Use .toolbar(id:) with ToolbarItem(id:)
|
+- Search field in toolbar
|  +- Minimize to button -> .searchToolbarBehavior(.minimize)
|  +- Reposition search -> DefaultToolbarItem(kind: .search, placement:)
|
+- Toolbar transition/animation
|  +- Zoom transition from toolbar item -> .matchedTransitionSource(id:in:)
|  +- Hide glass background -> .sharedBackgroundVisibility(.hidden)
|
+- Custom subtitle area content
|  +- Use ToolbarItem(placement: .largeSubtitle)
|
+- System toolbar items with custom placement
|  +- DefaultToolbarItem(kind: .search/.sidebar, placement:)

ContentView()
    .toolbar(id: "main-toolbar") {
        ToolbarItem(id: "tag") {
            TagButton()
        }
        ToolbarItem(id: "share") {
            ShareButton()
        }
        ToolbarSpacer(.fixed)
        ToolbarItem(id: "more") {
            MoreButton()
        }
    }

ToolbarSpacer(.fixed)      // Fixed-width space
ToolbarSpacer(.flexible)   // Flexible space — pushes items apart

// ❌ Missing IDs in customizable toolbar — items can't be customized
.toolbar(id: "main") {
    ToolbarItem {           // No id parameter
        ShareButton()
    }
}

// ✅ Every item needs its own ID
.toolbar(id: "main") {
    ToolbarItem(id: "share") {
        ShareButton()
    }
}

@State private var searchText = ""

NavigationStack {
    RecipeList()
        .searchable(text: $searchText)
        .searchToolbarBehavior(.minimize)
}

NavigationSplitView {
    AllCalendarsView()
} detail: {
    SelectedCalendarView()
        .searchable(text: $query)
        .toolbar {
            ToolbarItem(placement: .bottomBar) {
                CalendarPicker()
            }
            ToolbarItem(placement: .bottomBar) {
                Invites()
            }
            DefaultToolbarItem(kind: .search, placement: .bottomBar)
            ToolbarSpacer(placement: .bottomBar)
            ToolbarItem(placement: .bottomBar) {
                NewEventButton()
            }
        }
}

.toolbar {
    DefaultToolbarItem(kind: .search, placement: .bottomBar)
    DefaultToolbarItem(kind: .sidebar, placement: .navigationBarLeading)
}

NavigationStack {
    DetailView()
        .navigationTitle("Title")
        .navigationSubtitle("Subtitle")
        .toolbar {
            ToolbarItem(placement: .largeSubtitle) {
                CustomLargeNavigationSubtitle()
            }
        }
}

struct ContentView: View {
    @State private var isPresented = false
    @Namespace private var namespace

    var body: some View {
        NavigationStack {
            DetailView()
                .toolbar {
                    ToolbarItem(placement: .topBarTrailing) {
                        Button("Show Sheet", systemImage: "globe") {
                            isPresented = true
                        }
                    }
                    .matchedTransitionSource(id: "world", in: namespace)
                }
                .sheet(isPresented: $isPresented) {
                    SheetView()
                        .navigationTransition(
                            .zoom(sourceID: "world", in: namespace))
                }
        }
    }
}

ContentView()
    .toolbar(id: "main") {
        ToolbarItem(id: "build-status", placement: .principal) {
            BuildStatus()
        }
        .sharedBackgroundVisibility(.hidden)
    }