如何使用底部导航栏导航到新页面？

【问题标题】：How do i navigate to new pages using my bottom-navigation-bar?如何使用底部导航栏导航到新页面？
【发布时间】：2021-12-14 01:40:23
【问题描述】：

我想使用底部导航栏导航到新页面。使用底部导航栏以及我在下面附加的代码导航到新页面的可能方法是什么。

此外，我不希望在我的新页面中出现底部导航栏。我只想要当前页面的底部导航栏。

提前谢谢你。

代码：

class dashboard extends StatefulWidget {
  @override
  _dashboardState createState() => _dashboardState();
}

// ignore: camel_case_types
class _dashboardState extends State<dashboard> {
  int currentIndex = 1;

  changeIndex(index) {
    setState(() {
      currentIndex = index;
    });
  }

  @override
  Widget build(BuildContext context) {
    final authService = Provider.of<AuthService>(context);
    return Scaffold(
      body: SingleChildScrollView(
        child: Column(
          children: <Widget>[
            Padding(
              padding: const EdgeInsets.only(top: 80.0, right: 250),
              child: Center(
                child: Container(
                  width: 200.0,
                  height: 20.0,
                  decoration:
                      BoxDecoration(borderRadius: BorderRadius.circular(15.0)),
                  child: (const Text(
                    'Hello',
                    textAlign: TextAlign.center,
                    style: TextStyle(
                        fontWeight: FontWeight.bold, color: Colors.black),
                  )),
                ),
              ),
            ),
            Padding(
              padding: EdgeInsets.only(left: 300.0, top: 1.0),
              child: IconButton(
                icon: new Icon(Icons.account_circle, size: 30.0),
                onPressed: () {
                  Navigator.push(
                    context,
                    MaterialPageRoute(
                      builder: (context) => Notifications(),
                    ),
                  );
                },
              ),
            ),
            Padding(
              padding: EdgeInsets.only(left: 300.0, top: 5.0),
              child: IconButton(
                icon: const Icon(
                  Icons.notifications,
                  size: 25.0,
                ),
                onPressed: () {
                  Navigator.push(
                    context,
                    MaterialPageRoute(
                      builder: (context) => Notifications(),
                    ),
                  );
                },
              ),
            ),
            Padding(
              padding: const EdgeInsets.only(top: 0.0),
              child: Center(
                child: Container(
                  width: 390,
                  height: 450,
                  decoration: BoxDecoration(
                      color: Colors.green.shade100,
                      borderRadius: BorderRadius.circular(10.0)),
                ),
              ),
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(onPressed: () async {
        await authService.signOut();
      }),
      //  : _children[_currentIndex],
      bottomNavigationBar: BottomNavigationBar(
        type: BottomNavigationBarType.fixed,
        backgroundColor: Colors.green[100],
        items: const [
          BottomNavigationBarItem(
            icon: Icon(Icons.book_online),
            label: 'Page 1',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.read_more),
            label: 'Page 2',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.account_circle),
            label: 'Profile',
          ),
        ],
      ),
    );
  }
}

【问题讨论】：

    标签： flutter dart routes flutter-bottomnavigation


    【解决方案1】：

    您可以使用 onTap 属性

    onTap: _onItemTapped,

 void _onItemTapped(int index) {
    setState(() {
      _selectedIndex = index;
    });
  }

    查看完整代码

    import 'package:flutter/material.dart';

class dashboadrState extends StatefulWidget {
  const dashboadrState({Key? key}) : super(key: key);

  @override
  State<dashboadrState> createState() => _dashboadrStateState();
}

class _dashboadrStateState extends State<dashboadrState> {
  void _onItemTapped(int index) {
    setState(() {
      _selectedIndex = index;
    });
  }

  int _selectedIndex = 0;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SingleChildScrollView(
        child: Column(
          children: <Widget>[
            Padding(
              padding: const EdgeInsets.only(top: 80.0, right: 250),
              child: Center(
                child: Container(
                  width: 200.0,
                  height: 20.0,
                  decoration:
                      BoxDecoration(borderRadius: BorderRadius.circular(15.0)),
                  child: (const Text(
                    'Hello',
                    textAlign: TextAlign.center,
                    style: TextStyle(
                        fontWeight: FontWeight.bold, color: Colors.black),
                  )),
                ),
              ),
            ),
            Padding(
              padding: EdgeInsets.only(left: 300.0, top: 1.0),
              child: IconButton(
                icon: new Icon(Icons.account_circle, size: 30.0),
                onPressed: () {
                  print("hit");
                  // Navigator.push(
                  //   context,
                  //   MaterialPageRoute(
                  //     builder: (context) => Notifications(),
                  //   ),
                  // );
                },
              ),
            ),
            Padding(
              padding: EdgeInsets.only(left: 300.0, top: 5.0),
              child: IconButton(
                icon: const Icon(
                  Icons.notifications,
                  size: 25.0,
                ),
                onPressed: () {
                  print("hit ");
                  // Navigator.push(
                  //   context,
                  //   MaterialPageRoute(
                  //     builder: (context) => Notifications(),
                  //   ),
                  // );
                },
              ),
            ),
            Padding(
              padding: const EdgeInsets.only(top: 0.0),
              child: Center(
                child: Container(
                  width: 390,
                  height: 450,
                  decoration: BoxDecoration(
                      color: Colors.green.shade100,
                      borderRadius: BorderRadius.circular(10.0)),
                ),
              ),
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(onPressed: () async {
        // await authService.signOut();
      }),
      //  : _children[_currentIndex],
      bottomNavigationBar: BottomNavigationBar(
        type: BottomNavigationBarType.fixed,
        backgroundColor: Colors.green[100],
        items: const [
          BottomNavigationBarItem(
            icon: Icon(Icons.book_online),
            label: 'Page 1',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.read_more),
            label: 'Page 2',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.account_circle),
            label: 'Profile',
          ),
        ],
        currentIndex: _selectedIndex,
        selectedItemColor: Colors.amber[800],
        onTap: _onItemTapped,
      ),
    );
  }
}

    输出

    更新的答案（屏幕根据需要动态变化）

    代码：-

    import 'package:flutter/material.dart';

class dashboadrState extends StatefulWidget {
  const dashboadrState({Key? key}) : super(key: key);

  @override
  State<dashboadrState> createState() => _dashboadrStateState();
}

class _dashboadrStateState extends State<dashboadrState> {
  void _onItemTapped(int index) {
    setState(() {
      _selectedIndex = index;
    });
  }

  int _selectedIndex = 0;
  static final List<Widget> _widgetOptions = <Widget>[
    Scaffold(
      body: SingleChildScrollView(
        child: Column(
          children: <Widget>[
            Padding(
              padding: const EdgeInsets.only(top: 80.0, right: 250),
              child: Center(
                child: Container(
                  width: 200.0,
                  height: 20.0,
                  decoration:
                      BoxDecoration(borderRadius: BorderRadius.circular(15.0)),
                  child: (const Text(
                    'Hello',
                    textAlign: TextAlign.center,
                    style: TextStyle(
                        fontWeight: FontWeight.bold, color: Colors.black),
                  )),
                ),
              ),
            ),
            Padding(
              padding: const EdgeInsets.only(left: 300.0, top: 1.0),
              child: IconButton(
                icon: const Icon(Icons.account_circle, size: 30.0),
                onPressed: () {
                  print("hit");
                  // Navigator.push(
                  //   context,
                  //   MaterialPageRoute(
                  //     builder: (context) => Notifications(),
                  //   ),
                  // );
                },
              ),
            ),
            Padding(
              padding: const EdgeInsets.only(left: 300.0, top: 5.0),
              child: IconButton(
                icon: const Icon(
                  Icons.notifications,
                  size: 25.0,
                ),
                onPressed: () {
                  print("hit ");
                  // Navigator.push(
                  //   context,
                  //   MaterialPageRoute(
                  //     builder: (context) => Notifications(),
                  //   ),
                  // );
                },
              ),
            ),
            Padding(
              padding: const EdgeInsets.only(top: 0.0),
              child: Center(
                child: Container(
                  width: 390,
                  height: 450,
                  decoration: BoxDecoration(
                      color: Colors.green.shade100,
                      borderRadius: BorderRadius.circular(10.0)),
                ),
              ),
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(onPressed: () async {
        // await authService.signOut();
      }),
    ),
    const Text(
      'Index 1: Business',
    ),
    const Text(
      'Index 2: School',
    ),
  ];
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: _widgetOptions.elementAt(_selectedIndex),
      ),

      //  : _children[_currentIndex],
      bottomNavigationBar: BottomNavigationBar(
        type: BottomNavigationBarType.fixed,
        backgroundColor: Colors.green[100],
        items: const [
          BottomNavigationBarItem(
            icon: Icon(Icons.book_online),
            label: 'Page 1',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.read_more),
            label: 'Page 2',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.account_circle),
            label: 'Profile',
          ),
        ],
        currentIndex: _selectedIndex,
        selectedItemColor: Colors.amber[800],
        onTap: _onItemTapped,
      ),
    );
  }
}

    输出

    【讨论】：

    • 嗨，我想要的是使用底部导航栏导航到不同的屏幕。
    • 是的，您可以这样做，只需更改 ontap 功能上的屏幕
    • 我试过了，但我得到了这个错误：参数类型'void Function()'不能分配给参数类型'void Function(int)?'。
    【解决方案2】：

    您可以在BottomNavigationBar 上添加onTap: onTabTapped，然后使用选定的索引导航到您的目标页面

      void onTabTapped(int index) {
    if(index==2) {
      Navigator.of(context).pushReplacement(
        new MaterialPageRoute(builder: (context) => new YourPage())
    }
  }

    【讨论】：

    • 非常感谢:)
    【解决方案3】：

    请参考以下代码：

    import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final GlobalKey<NavigatorState> _navigatorKey = GlobalKey<NavigatorState>();
  int _currentTabIndex = 0;
  ValueNotifier<bool> refreshPage = ValueNotifier(false);

  @override
  Widget build(BuildContext context) {
    return ValueListenableBuilder<bool>(
      valueListenable: refreshPage,
      builder: (context, value, child) {
        return WillPopScope(
          onWillPop: () {
            Navigator.of(context).pop();
          },
          child: Scaffold(
            backgroundColor: _currentTabIndex == 0
                ? Colors.white
                : _currentTabIndex == 1
                    ? Colors.green
                    : Colors.green,
            appBar: AppBar(
              backgroundColor: Colors.white,
              elevation: 0,
              title: Text(
                "Bottom Navigation Bar",
                style: TextStyle(
                    color: Colors.black,
                    fontSize: 14,
                    fontWeight: FontWeight.w600),
              ),
              leading: IconButton(
                icon: Icon(
                  Icons.arrow_back_ios,
                  size: 18.0,
                  color: Colors.black,
                ),
                onPressed: () {
                  Navigator.of(context).pop();
                },
              ),
              centerTitle: true,
            ),
            body: SingleChildScrollView(
              child: _currentTabIndex == 0
                  ? Column(
                      children: <Widget>[
                        Padding(
                          padding: const EdgeInsets.only(top: 80.0, right: 250),
                          child: Center(
                            child: Container(
                              width: 200.0,
                              height: 20.0,
                              decoration: BoxDecoration(
                                  borderRadius: BorderRadius.circular(15.0)),
                              child: (const Text(
                                'Hello',
                                textAlign: TextAlign.center,
                                style: TextStyle(
                                    fontWeight: FontWeight.bold,
                                    color: Colors.black),
                              )),
                            ),
                          ),
                        ),
                        Padding(
                          padding: EdgeInsets.only(left: 300.0, top: 1.0),
                          child: IconButton(
                            icon: new Icon(Icons.account_circle, size: 30.0),
                            onPressed: () {
                              Navigator.push(
                                context,
                                MaterialPageRoute(
                                  builder: (context) => Notifications(),
                                ),
                              );
                            },
                          ),
                        ),
                        Padding(
                          padding: EdgeInsets.only(left: 300.0, top: 5.0),
                          child: IconButton(
                            icon: const Icon(
                              Icons.notifications,
                              size: 25.0,
                            ),
                            onPressed: () {
                              Navigator.push(
                                context,
                                MaterialPageRoute(
                                  builder: (context) => Notifications(),
                                ),
                              );
                            },
                          ),
                        ),
                        Padding(
                          padding: const EdgeInsets.only(top: 0.0),
                          child: Center(
                            child: Container(
                              width: 390,
                              height: 450,
                              decoration: BoxDecoration(
                                  color: Colors.green.shade100,
                                  borderRadius: BorderRadius.circular(10.0)),
                            ),
                          ),
                        ),
                      ],
                    )
                  : _currentTabIndex == 1
                      ? Column(
                          crossAxisAlignment: CrossAxisAlignment.center,
                          mainAxisAlignment: MainAxisAlignment.center,
                          children: [
                            Container(
                                color: Colors.green,
                                child: Center(child: Text("Page 2"))),
                          ],
                        )
                      : Column(
                          crossAxisAlignment: CrossAxisAlignment.center,
                          mainAxisAlignment: MainAxisAlignment.center,
                          children: [
                            Container(
                                color: Colors.green,
                                child: Center(child: Text("Profile"))),
                          ],
                        ),
            ),
            bottomNavigationBar: _bottomNavigationBar(),
          ),
        );
      },
    );
  }

  Widget _bottomNavigationBar() {
    return BottomNavigationBar(
      type: BottomNavigationBarType.fixed,
      items: [
        BottomNavigationBarItem(
          icon: Icon(Icons.book_online),
          label: 'Page 1',
        ),
        BottomNavigationBarItem(
          icon: Icon(Icons.read_more),
          label: 'Page 2',
        ),
        BottomNavigationBarItem(
          icon: Icon(Icons.account_circle),
          label: 'Profile',
        )
      ],
      onTap: _onTap,
      currentIndex: _currentTabIndex,
    );
  }

  _onTap(int tabIndex) {
    switch (tabIndex) {
      case 0:
        Notifications();
        // _navigatorKey.currentState.pushReplacementNamed("Page 1");
        break;
      case 1:
        Notifications();
        //  _navigatorKey.currentState.pushReplacementNamed("Page 2");
        break;
      case 2:
        Notifications();
        // _navigatorKey.currentState.pushReplacementNamed("Profile");
        break;
    }

    _currentTabIndex = tabIndex;
    refreshPage.value = !refreshPage.value;
  }

  Route<dynamic> generateRoute(RouteSettings settings) {
    switch (settings.name) {
      case "Page 1":
        return MaterialPageRoute(builder: (context) => Notifications()
            // Container(
            //     color: Colors.green, child: Center(child: Text("Page 1")))
            );
      case "Page 2":
        return MaterialPageRoute(builder: (context) => Notifications()
            //  Container(
            //     color: Colors.green, child: Center(child: Text("Page 2")))
            );
      default:
        return MaterialPageRoute(builder: (context) => Notifications()
            // Container(
            //     color: Colors.green, child: Center(child: Text("Profile")))
            );
    }
  }
}

class Notifications extends StatefulWidget {
  Notifications({Key key, this.title}) : super(key: key);
  final String title;

  @override
  _NavitionState createState() => _NavitionState();
}

class _NavitionState extends State<Notifications> {
  @override
  Widget build(BuildContext context) {
    return WillPopScope(
      onWillPop: () {
        Navigator.of(context).pop();
      },
      child: Scaffold(
        backgroundColor: Colors.white,
        appBar: AppBar(
          backgroundColor: Colors.white,
          elevation: 0,
          title: Text(
            "Notification",
            style: TextStyle(
                color: Colors.black, fontSize: 14, fontWeight: FontWeight.w600),
          ),
          leading: IconButton(
            icon: Icon(
              Icons.arrow_back_ios,
              size: 18.0,
              color: Colors.black,
            ),
            onPressed: () {
              Navigator.of(context).pop();
            },
          ),
          centerTitle: true,
        ),
        body: Column(
          crossAxisAlignment: CrossAxisAlignment.center,
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Center(
              child: Container(
                child: Text("Notification Body"),
              ),
            )
          ],
        ),
      ),
    );
  }
}

    【讨论】：

    • 非常感谢:)
    【解决方案4】：

    请参考以下代码

    import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final GlobalKey<NavigatorState> _navigatorKey = GlobalKey<NavigatorState>();
  int _currentTabIndex = 0;
  ValueNotifier<bool> refreshPage = ValueNotifier(false);

  @override
  Widget build(BuildContext context) {
    return ValueListenableBuilder<bool>(
      valueListenable: refreshPage,
      builder: (context, value, child) {
        return WillPopScope(
          onWillPop: () {
            Navigator.of(context).pop();
          },
          child: Scaffold(
            backgroundColor: _currentTabIndex == 0
                ? Colors.white
                : _currentTabIndex == 1
                    ? Colors.green
                    : Colors.green,
            appBar: AppBar(
              backgroundColor: Colors.white,
              elevation: 0,
              title: Text(
                "Bottom Navigation Bar",
                style: TextStyle(
                    color: Colors.black,
                    fontSize: 14,
                    fontWeight: FontWeight.w600),
              ),
              leading: IconButton(
                icon: Icon(
                  Icons.arrow_back_ios,
                  size: 18.0,
                  color: Colors.black,
                ),
                onPressed: () {
                  Navigator.of(context).pop();
                },
              ),
              centerTitle: true,
            ),
            body: SingleChildScrollView(
              child: _currentTabIndex == 0
                  ? Column(
                      children: <Widget>[
                        Padding(
                          padding: const EdgeInsets.only(top: 80.0, right: 250),
                          child: Center(
                            child: Container(
                              width: 200.0,
                              height: 20.0,
                              decoration: BoxDecoration(
                                  borderRadius: BorderRadius.circular(15.0)),
                              child: (const Text(
                                'Hello',
                                textAlign: TextAlign.center,
                                style: TextStyle(
                                    fontWeight: FontWeight.bold,
                                    color: Colors.black),
                              )),
                            ),
                          ),
                        ),
                        Padding(
                          padding: EdgeInsets.only(left: 300.0, top: 1.0),
                          child: IconButton(
                            icon: new Icon(Icons.account_circle, size: 30.0),
                            onPressed: () {
                              Navigator.push(
                                context,
                                MaterialPageRoute(
                                  builder: (context) => Notifications(),
                                ),
                              );
                            },
                          ),
                        ),
                        Padding(
                          padding: EdgeInsets.only(left: 300.0, top: 5.0),
                          child: IconButton(
                            icon: const Icon(
                              Icons.notifications,
                              size: 25.0,
                            ),
                            onPressed: () {
                              Navigator.push(
                                context,
                                MaterialPageRoute(
                                  builder: (context) => Notifications(),
                                ),
                              );
                            },
                          ),
                        ),
                        Padding(
                          padding: const EdgeInsets.only(top: 0.0),
                          child: Center(
                            child: Container(
                              width: 390,
                              height: 450,
                              decoration: BoxDecoration(
                                  color: Colors.green.shade100,
                                  borderRadius: BorderRadius.circular(10.0)),
                            ),
                          ),
                        ),
                      ],
                    )
                  : _currentTabIndex == 1
                      ? Column(
                          crossAxisAlignment: CrossAxisAlignment.center,
                          mainAxisAlignment: MainAxisAlignment.center,
                          children: [
                            Container(
                                color: Colors.green,
                                child: Center(child: Text("Page 2"))),
                          ],
                        )
                      : Column(
                          crossAxisAlignment: CrossAxisAlignment.center,
                          mainAxisAlignment: MainAxisAlignment.center,
                          children: [
                            Container(
                                color: Colors.green,
                                child: Center(child: Text("Profile"))),
                          ],
                        ),
            ),
            bottomNavigationBar: _bottomNavigationBar(),
          ),
        );
      },
    );
  }

  Widget _bottomNavigationBar() {
    return BottomNavigationBar(
      type: BottomNavigationBarType.fixed,
      items: [
        BottomNavigationBarItem(
          icon: Icon(Icons.book_online),
          label: 'Page 1',
        ),
        BottomNavigationBarItem(
          icon: Icon(Icons.read_more),
          label: 'Page 2',
        ),
        BottomNavigationBarItem(
          icon: Icon(Icons.account_circle),
          label: 'Profile',
        )
      ],
      onTap: _onTap,
      currentIndex: _currentTabIndex,
    );
  }

  _onTap(int tabIndex) {
    switch (tabIndex) {
      case 0:
        Notifications();
        // _navigatorKey.currentState.pushReplacementNamed("Page 1");
        break;
      case 1:
        Notifications();
        //  _navigatorKey.currentState.pushReplacementNamed("Page 2");
        break;
      case 2:
        Notifications();
        // _navigatorKey.currentState.pushReplacementNamed("Profile");
        break;
    }

    _currentTabIndex = tabIndex;
    refreshPage.value = !refreshPage.value;
  }

  Route<dynamic> generateRoute(RouteSettings settings) {
    switch (settings.name) {
      case "Page 1":
        return MaterialPageRoute(builder: (context) => Notifications()
            // Container(
            //     color: Colors.green, child: Center(child: Text("Page 1")))
            );
      case "Page 2":
        return MaterialPageRoute(builder: (context) => Notifications()
            //  Container(
            //     color: Colors.green, child: Center(child: Text("Page 2")))
            );
      default:
        return MaterialPageRoute(builder: (context) => Notifications()
            // Container(
            //     color: Colors.green, child: Center(child: Text("Profile")))
            );
    }
  }
}

class Notifications extends StatefulWidget {
  Notifications({Key key, this.title}) : super(key: key);
  final String title;

  @override
  _NavitionState createState() => _NavitionState();
}

class _NavitionState extends State<Notifications> {
  @override
  Widget build(BuildContext context) {
    return WillPopScope(
      onWillPop: () {
        Navigator.of(context).pop();
      },
      child: Scaffold(
        backgroundColor: Colors.white,
        appBar: AppBar(
          backgroundColor: Colors.white,
          elevation: 0,
          title: Text(
            "Notification",
            style: TextStyle(
                color: Colors.black, fontSize: 14, fontWeight: FontWeight.w600),
          ),
          leading: IconButton(
            icon: Icon(
              Icons.arrow_back_ios,
              size: 18.0,
              color: Colors.black,
            ),
            onPressed: () {
              Navigator.of(context).pop();
            },
          ),
          centerTitle: true,
        ),
        body: Column(
          crossAxisAlignment: CrossAxisAlignment.center,
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Center(
              child: Container(
                child: Text("Notification Body"),
              ),
            )
          ],
        ),
      ),
    );
  }
}

    【讨论】：

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