les prémices d'une navbar

NavigationExemple/ContentView.swift

@@ -7,42 +7,31 @@
 
 import SwiftUI
 
-class User: ObservableObject {
-    @Published var score = 0
-}
-
-struct ChangeView: View {
-    @EnvironmentObject var user: User
-    
-    var body: some View {
-        VStack{
-            Text("Score : \(user.score)")
-            Button("Increase"){
-                self.user.score += 1
-            }
-        }
-    }
-}
 
 
 struct ContentView: View {
-    @ObservedObject var user = User()
+    @State private var score = 0
     
     var body: some View {
         NavigationView{
             
-            VStack(alignment: /*@START_MENU_TOKEN@*/.center/*@END_MENU_TOKEN@*/, spacing: 20){
-                Text("Score: \(user.score)")
-                
-                NavigationLink(destination: ChangeView()){
-                    Text("Show detail view")
-                }
-              
-               
-            }.navigationTitle("Menu principal")
+            Text("Score: \(score)")
+                .navigationTitle("Menu principal")
+                .navigationBarItems(
+                    
+                    trailing:
+                        HStack{
+                            Button("Add"){
+                                self.score += 1
+                            }
+                            
+                            Button("Sub"){
+                                self.score -= 1
+                            }
+                        }                    
+                    
+                )
         }
-        // Important à ajouter
-        .environmentObject(user)
         
     }
 }