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How to preview your layout in a navigation view

Paul Hudson    @twostraws   

Fully updated for Xcode 11.3

If you’ve designed a view that you know will be presented as part of a navigation stack, but doesn’t itself contain a navigation view, you won’t see its navigation bar title or buttons by default.

Fortunately, you can add your view to a navigation view right inside your preview – this simulates having a navigation bar at the top without actually adding one for the live code, so you can see exactly how it looks.

For example, this view has no navigation view but is configured to display in a specific way when presented as part of one – i.e. being pushed from another view:

struct ContentView: View {
   var body: some View {
      Text("Hello World")
         .navigationBarTitle("Welcome")
   }
}

To preview that in a navigation view, just add a NavigationView around the content view in your preview, like this:

#if DEBUG
struct ContentView_Previews: PreviewProvider {
   static var previews: some View {
      NavigationView {
         ContentView()
      }
   }
}
#endif

This allows you to see accurately how the view will look without having to modify the view’s actual layout.

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