9

lib/06/02/main.dart

@@ -2,7 +2,7 @@ import 'package:flutter/material.dart';
 
 import 'pages/page_a.dart';
 import 'pages/page_b.dart';
-import 'pages/page_c.dart';
+import 'pages/home_page.dart';
 
 void main() {
   runApp(const MyApp());
@@ -23,25 +23,26 @@ class MyApp extends StatelessWidget {
           titleTextStyle: TextStyle(color: Colors.black,fontSize: 18,fontWeight: FontWeight.bold)
         )
       ),
-      home:  const PageA(),
-      onUnknownRoute: _onUnknownRoute,
+      initialRoute: '/a/b',
+      onGenerateRoute: _onGenerateRoute,
     );
   }
 
-  Route? _onUnknownRoute(RouteSettings settings) {
+  Route? _onGenerateRoute(RouteSettings settings) {
     String? name = settings.name;
     Widget? page ;
+    if(name=='/'){
+      page = const HomePage();
+    }
     if(name=='/a'){
       page = const PageA();
     }
-    if(name=='/b'){
+    if(name=='/a/b'){
       page = const PageB();
     }
-    if(name=='/c'){
-      page = const PageC();
-    }
+
     if(page!=null){
-      return MaterialPageRoute(builder: (_)=> const PageB());
+      return MaterialPageRoute(builder: (_)=> page!,settings: settings);
     }
     return null;
   }

lib/06/02/pages/home_page.dart

@@ -0,0 +1,28 @@
+import 'package:flutter/material.dart';
+
+class HomePage extends StatelessWidget {
+  const HomePage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    const Color bgColor = Color(0xffFFE6CD);
+
+    return Scaffold(
+      backgroundColor: bgColor,
+      appBar: AppBar(
+        title: const Text('主页面'),
+        backgroundColor: bgColor,
+      ),
+      body: Center(
+        child: ElevatedButton(
+          onPressed: ()=>toPageA(context),
+          child: const Text('Push A'),
+        ),
+      ),
+    );
+  }
+
+  void toPageA(BuildContext context){
+    Navigator.of(context).pushNamed('/a');
+  }
+}

lib/06/02/pages/page_b.dart

@@ -1,6 +1,6 @@
 import 'package:flutter/material.dart';
 
-import 'page_c.dart';
+import 'home_page.dart';
 
 class PageB extends StatelessWidget {
   const PageB({super.key});
@@ -17,13 +17,13 @@ class PageB extends StatelessWidget {
       body: Center(
         child: ElevatedButton(
           onPressed: ()=>toPageC(context),
-          child: const Text('Push C'),
+          child: const Text('回到主界面'),
         ),
       ),
     );
   }
 
   void toPageC(BuildContext context){
-    Navigator.of(context).push(MaterialPageRoute(builder: (_)=> const PageC()));
+    Navigator.of(context).popUntil(ModalRoute.withName('/'));
   }
 }

lib/06/02/pages/page_c.dart

@@ -1,21 +0,0 @@
-import 'package:flutter/material.dart';
-
-class PageC extends StatelessWidget {
-  const PageC({super.key});
-
-  @override
-  Widget build(BuildContext context) {
-    const Color bgColor = Color(0xffFFE6CD);
-
-    return Scaffold(
-      backgroundColor: bgColor,
-      appBar: AppBar(
-        title: const Text('C'),
-        backgroundColor: bgColor,
-      ),
-      body: const Center(
-        child: Text('到达终点'),
-      ),
-    );
-  }
-}