Why doesn’t the navigation title show up using SwiftUI?

.navigationBarTitle() and .navigationBarItem() are modifiers on the View inside of the NavigationView, not on the NavigationView itself:

struct LandmarkList: View {
    var body: some View {
        NavigationView {
            List(landmarkData) { landmark in
                LandmarkRow(landmark: landmark)
            }
            .navigationBarItem(title: Text("Done"))
            .navigationBarTitle(Text("Landmarks"))
        }
    }
}

and if you think about it, this makes sense. As the View within the NavigationView changes, the new View dictates what the title and contents of the navigation bar should be.