从新修改页面保持状态

lib/home_page.dart

@@ -16,11 +16,10 @@ class HomePage extends StatefulWidget {
   _HomePageState createState() => _HomePageState();
 }
 
-class _HomePageState extends State < HomePage > with SingleTickerProviderStateMixin{
-  
-   TabController _controller;
+class _HomePageState extends State < HomePage > with SingleTickerProviderStateMixin {
+
   int _currentIndex = 0;
-  List<Widget> pageList =[
+  List < Widget > pageList = [
     OrderTakingPage(),
     OrderManagementPage(),
     SendExpressPage(),
@@ -30,60 +29,53 @@ class _HomePageState extends State < HomePage > with SingleTickerProviderStateMi
   @override
   void initState() {
     super.initState();
-     _controller = TabController(length: pageList.length, vsync: this);
   }
 
   @override
   Widget build(BuildContext context) {
-    return 
-      Scaffold(
-        body: TabBarView(
-          physics: NeverScrollableScrollPhysics(), //禁止滚动
-          controller: _controller,
-          children: [
-             OrderTakingPage(),
-              OrderManagementPage(),
-              SendExpressPage(),
-              MyPage()
-          ]),
-        bottomNavigationBar: BottomNavigationBar(
-          currentIndex: _currentIndex,
-          type: BottomNavigationBarType.fixed,
-          items:[
-            BottomNavigationBarItem(
-              icon: Image.asset('lib/images/icon_jiedan.png',scale: 1.6,),
-              title: Text('接单',style: TextStyle(color:_currentIndex==0?Color.fromRGBO(64, 98, 254, 1):Colors.grey,fontSize: ScreenUtil.getInstance().setSp(20)),),
-              activeIcon: Image.asset('lib/images/icon_jiedan01.png',scale: 1.6)
-            ),
-            BottomNavigationBarItem(
-               icon: Image.asset('lib/images/icon_dingdan.png',scale: 1.6),
-              title: Text('订单管理',style: TextStyle(color:_currentIndex==1?Color.fromRGBO(64, 98, 254, 1):Colors.grey,fontSize: ScreenUtil.getInstance().setSp(20)),),
-              activeIcon: Image.asset('lib/images/icon_dingdan01.png',scale: 1.6)
-            ),
-            BottomNavigationBarItem(
-               icon: Image.asset('lib/images/icon_fajian.png',scale: 1.6),
-              title: Text('发件',style: TextStyle(color:_currentIndex==2?Color.fromRGBO(64, 98, 254, 1):Colors.grey,fontSize: ScreenUtil.getInstance().setSp(20)),),
-              activeIcon: Image.asset('lib/images/icon_fajian01.png',scale: 1.6)
-            ),
-            BottomNavigationBarItem(
-               icon: Image.asset('lib/images/icon_wode.png',scale: 1.6),
-              title: Text('我的',style: TextStyle(color:_currentIndex==3?Color.fromRGBO(64, 98, 254, 1):Colors.grey,fontSize: ScreenUtil.getInstance().setSp(20)),),
-              activeIcon: Image.asset('lib/images/icon_wode01.png',scale: 1.6)
-            ),
-          ],
-          onTap: (index){
-            setState(() {
-              _currentIndex = index;
-            });
-            // if(_currentIndex==2){
-            //    Navigator.pushReplacement(context, MaterialPageRoute(builder: (context){
-            //       return SendExpressPage();
-            //     }));
-            // }else{
-               _controller.animateTo(_currentIndex);
-            //}
-          },
-        ),
-      );
+    return
+    Scaffold(
+      body: IndexedStack(
+        index: _currentIndex,
+        children: pageList
+      ),
+      bottomNavigationBar: BottomNavigationBar(
+        currentIndex: _currentIndex,
+        type: BottomNavigationBarType.fixed,
+        items: [
+          BottomNavigationBarItem(
+            icon: Image.asset('lib/images/icon_jiedan.png', scale: 1.6, ),
+            title: Text('接单', style: TextStyle(color: _currentIndex == 0 ? Color.fromRGBO(64, 98, 254, 1) : Colors.grey, fontSize: ScreenUtil.getInstance().setSp(20)), ),
+            activeIcon: Image.asset('lib/images/icon_jiedan01.png', scale: 1.6)
+          ),
+          BottomNavigationBarItem(
+            icon: Image.asset('lib/images/icon_dingdan.png', scale: 1.6),
+            title: Text('订单管理', style: TextStyle(color: _currentIndex == 1 ? Color.fromRGBO(64, 98, 254, 1) : Colors.grey, fontSize: ScreenUtil.getInstance().setSp(20)), ),
+            activeIcon: Image.asset('lib/images/icon_dingdan01.png', scale: 1.6)
+          ),
+          BottomNavigationBarItem(
+            icon: Image.asset('lib/images/icon_fajian.png', scale: 1.6),
+            title: Text('发件', style: TextStyle(color: _currentIndex == 2 ? Color.fromRGBO(64, 98, 254, 1) : Colors.grey, fontSize: ScreenUtil.getInstance().setSp(20)), ),
+            activeIcon: Image.asset('lib/images/icon_fajian01.png', scale: 1.6)
+          ),
+          BottomNavigationBarItem(
+            icon: Image.asset('lib/images/icon_wode.png', scale: 1.6),
+            title: Text('我的', style: TextStyle(color: _currentIndex == 3 ? Color.fromRGBO(64, 98, 254, 1) : Colors.grey, fontSize: ScreenUtil.getInstance().setSp(20)), ),
+            activeIcon: Image.asset('lib/images/icon_wode01.png', scale: 1.6)
+          ),
+        ],
+        onTap: (index) {
+          setState(() {
+            _currentIndex = index;
+          });
+          // if(_currentIndex==2){
+          //    Navigator.pushReplacement(context, MaterialPageRoute(builder: (context){
+          //       return SendExpressPage();
+          //     }));
+          // }else{
+          //}
+        },
+      ),
+    );
   }
 }