7

lib/07/01/main.dart

@@ -16,6 +16,7 @@ class MyApp extends StatelessWidget {
       debugShowCheckedModeBanner: false,
       theme: ThemeData(
         appBarTheme: AppBarTheme(
+          elevation: 0,
           iconTheme: IconThemeData(color: Colors.black),
           titleTextStyle: TextStyle(color: Colors.black,fontSize: 18,fontWeight: FontWeight.bold)
         )

lib/07/01/pages/page_a.dart

@@ -1,5 +1,5 @@
 import 'package:flutter/material.dart';
-import 'package:iroute/07/01/pages/page_b.dart';
+import 'page_b.dart';
 
 class PageA extends StatelessWidget {
   const PageA({super.key});
@@ -10,14 +10,13 @@ class PageA extends StatelessWidget {
 
     return Scaffold(
       backgroundColor: bgColor,
-      appBar: AppBar(title: Text('A'),
-      elevation: 0,
+      appBar: AppBar(title: const Text('A'),
         backgroundColor: bgColor,
       ),
       body: Center(
         child: ElevatedButton(
           onPressed: ()=>toPageB(context),
-          child: Text('Push B'),
+          child: const Text('Push B'),
         ),
       ),
     );

lib/07/01/pages/page_b.dart

@@ -11,14 +11,13 @@ class PageB extends StatelessWidget {
 
     return Scaffold(
       backgroundColor: bgColor,
-      appBar: AppBar(title: Text('B',style: TextStyle(color: Colors.black),),
-        elevation: 0,
+      appBar: AppBar(title: const Text('B',),
         backgroundColor: bgColor,
       ),
       body: Center(
         child: ElevatedButton(
           onPressed: ()=>toPageC(context),
-          child: Text('Push C'),
+          child: const Text('Push C'),
         ),
       ),
     );

lib/07/01/pages/page_c.dart

@@ -5,12 +5,16 @@ class PageC extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    const Color bgColor = Color(0xffFFE6CD);
+
     return Scaffold(
-      appBar: AppBar(title: Text('C'),),
-      body: Center(
-        child: Text(
-          'C'
-        ),
+      backgroundColor: bgColor,
+      appBar: AppBar(
+        title: const Text('C'),
+        backgroundColor: bgColor,
+      ),
+      body: const Center(
+        child: Text('到达终点'),
       ),
     );
   }

lib/07/02/main.dart

@@ -0,0 +1,27 @@
+import 'package:flutter/material.dart';
+
+import 'pages/page_a.dart';
+
+void main() {
+  runApp(const MyApp());
+}
+
+class MyApp extends StatelessWidget {
+  const MyApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Flutter Demo',
+      debugShowCheckedModeBanner: false,
+      theme: ThemeData(
+        appBarTheme: AppBarTheme(
+          elevation: 0,
+          iconTheme: IconThemeData(color: Colors.black),
+          titleTextStyle: TextStyle(color: Colors.black,fontSize: 18,fontWeight: FontWeight.bold)
+        )
+      ),
+      home:  const PageA(),
+    );
+  }
+}

lib/07/02/pages/page_a.dart

@@ -0,0 +1,28 @@
+import 'package:flutter/material.dart';
+import 'page_b.dart';
+
+class PageA extends StatelessWidget {
+  const PageA({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    const Color bgColor = Color(0xffCCFFFF);
+
+    return Scaffold(
+      backgroundColor: bgColor,
+      appBar: AppBar(title: const Text('A'),
+        backgroundColor: bgColor,
+      ),
+      body: Center(
+        child: ElevatedButton(
+          onPressed: ()=>toPageB(context),
+          child: const Text('Push B'),
+        ),
+      ),
+    );
+  }
+
+  void toPageB(BuildContext context){
+    Navigator.of(context).pushReplacement(MaterialPageRoute(builder: (_)=> const PageB()));
+  }
+}

lib/07/02/pages/page_b.dart

@@ -0,0 +1,29 @@
+import 'package:flutter/material.dart';
+
+import 'page_c.dart';
+
+class PageB extends StatelessWidget {
+  const PageB({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    const Color bgColor = Color(0xffCCE5FF);
+
+    return Scaffold(
+      backgroundColor: bgColor,
+      appBar: AppBar(title: const Text('B',),
+        backgroundColor: bgColor,
+      ),
+      body: Center(
+        child: ElevatedButton(
+          onPressed: ()=>toPageC(context),
+          child: const Text('Push C'),
+        ),
+      ),
+    );
+  }
+
+  void toPageC(BuildContext context){
+    Navigator.of(context).pushReplacement(MaterialPageRoute(builder: (_)=> const PageC()));
+  }
+}

lib/07/02/pages/page_c.dart

@@ -0,0 +1,21 @@
+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'),
+      ),
+    );
+  }
+}

lib/07/节点介绍.txt

@@ -0,0 +1,4 @@
+01: 分析 push 方法。
+    A、B、C 三个界面跳转。
+
+02: replace