import SwiftUI

struct DetailView: View {
   var body: some View {
      VStack {
         Text("Details")
            .padding()
         Spacer()
      }
      .navigationTitle("My Title")
      .navigationSubtitle("My Subtitle")
      .toolbarTitleDisplayMode(.inlineLarge)
      .toolbar {
         #if os(macOS)
         ToolbarItem(placement: .primaryAction) {
            Button(action: {
               print("Add Item")
            }, label: {
               Image(systemName: "plus")
            })
         }
         #else
         ToolbarItem(placement: .topBarTrailing) {
            Button(action: {
               print("Add Item")
            }, label: {
               Image(systemName: "plus")
            })
         }
         #endif
      }
   }
}