flutter 底部特殊导航

 

import 'package:flutter/material.dart';
import 'each_view.dart';

class BottomAppBarDemo extends StatefulWidget {
  //const BottomAppBarDemo({super.key});
  @override
  State<BottomAppBarDemo> createState() => _BottomAppBarDemoState();
}

class _BottomAppBarDemoState extends State<BottomAppBarDemo> {
  late List<Widget> _eachView;
  int _index = 0;

  @override
  void initState() {
    super.initState();
    _eachView = [];
    _eachView
      ..add(EachView("Home"))
      ..add(EachView("Jspany"));
    // TODO: implement setState
    //super.setState(fn);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: _eachView[_index],
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          Navigator.of(context).push(MaterialPageRoute(builder: (ctx) {
            return EachView("new page");
          }));
        },
        tooltip: "JSPang",
        child: Icon(
          Icons.add,
          color: Colors.white,
        ),
      ),
      floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
      bottomNavigationBar: BottomAppBar(
        color: Colors.lightBlue,
        shape: CircularNotchedRectangle(),
        child: Row(
          mainAxisSize: MainAxisSize.max,
          mainAxisAlignment: MainAxisAlignment.spaceAround,
          children: <Widget>[
            IconButton(
              icon: Icon(Icons.home),
              color: Colors.white,
              onPressed: () {
                setState(() {
                  _index = 0;
                });
              },
            ),
            IconButton(
              icon: Icon(Icons.air_rounded),
              color: Colors.white,
              onPressed: () {
                setState(() {
                  _index = 1;
                });
              },
            )
          ],
        ),
      ),
    );
  }
}