Flutter定义tabbar底部导航路由跳转的方法

import 'package:flutter/material.dart';

class HomePage extends StatefulWidget {
  HomePage({Key key}) : super(key: key);

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

class _HomePageState extends State<HomePage> {
  @override
  Widget build(BuildContext context) {
    return Text("我是首页组件");
  }
}

import 'package:flutter/material.dart';
import 'tabs/Home.dart';
import 'tabs/Category.dart';
import 'tabs/Setting.dart';

class Tabs extends StatefulWidget {
  Tabs({Key key}) : super(key: key);

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

class _TabsState extends State<Tabs> {
  int _currentIndex = 0;
  // 把页面存放到数组里
  List _pageList = [
    HomePage(),
    CategoryPage(),
    SettingPage(),
  ];
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('首页'),
      ),
      body: this._pageList[this._currentIndex],
      bottomNavigationBar: BottomNavigationBar(
        // 默认选中第几项
        currentIndex: this._currentIndex,
        // 导航栏点击获取索引值
        onTap: (int index) {
          setState(() {
            this._currentIndex = index;
          });
        },
        iconSize: 30.0, //icon的大小
        fixedColor: Colors.red, //选中的颜色
        type: BottomNavigationBarType.fixed, //配置底部tabs可以有多个按钮
        //定义导航栏的图片+名称
        items: [
          BottomNavigationBarItem(icon: Icon(Icons.home), title: Text("首页")),
          BottomNavigationBarItem(
              icon: Icon(Icons.category), title: Text("分类")),
          BottomNavigationBarItem(
              icon: Icon(Icons.settings), title: Text("设置")),
        ],
      ),
    );
  }
}

import 'package:flutter/material.dart'; //快捷方式:fim
import 'pages/Tabs.dart';

void main() {
  runApp(MyApp());
}

//自定义组件
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      home: Tabs(),
      theme: ThemeData(primarySwatch: Colors.deepOrange),
      debugShowCheckedModeBanner: false,
    );
  }
}