End of Step 5: Get the ContentView to tell us the OS

AppShared/ContentView.swift

@@ -13,7 +13,16 @@ struct ContentView: View {
             Image(systemName: "globe")
                 .imageScale(.large)
                 .foregroundColor(.accentColor)
-            Text("Hello, world!")
+
+            #if os(iOS)
+            Text("Hello \(UIDevice.isIPad ? "iPadOS" : "iOS")")
+            #elseif os(macOS)
+            Text("Hello macOS")
+            #elseif os(tvOS)
+            Text("Hello tvOS")
+            #elseif os(watchOS)
+            Text("Hello watchOS")
+            #endif
         }
         .padding()
     }
@@ -24,3 +33,15 @@ struct ContentView_Previews: PreviewProvider {
         ContentView()
     }
 }
+
+#if os(iOS)
+extension UIDevice {
+    static var isIPad: Bool {
+        UIDevice.current.userInterfaceIdiom == .pad
+    }
+    
+    static var isIPhone: Bool {
+        UIDevice.current.userInterfaceIdiom == .phone
+    }
+}
+#endif