App开发之基础页面搭建

  assets:    - assets/tabs/

import 'package:flutter/material.dart';import 'package:flutter_songbei/custom/buttom_bat_item.dart';
import '../app_theme.dart';import 'tabs/found_tab.dart';import 'tabs/home_tab.dart';import 'tabs/message_tab.dart';import 'tabs/my_tab.dart';
class TabsPage extends StatefulWidget {  @override  State createState() {    return _TabsState();  }}
class _TabsState extends State<TabsPage> {  int _selectedIndex = 0;  List pages = List();

  @override  void initState() {    super.initState();    pages..add(HomeTab())..add(FoundTab())..add(MessageTab())..add(MyTab());  }
  @override  Widget build(BuildContext context) {    return Scaffold(      bottomNavigationBar: BottomAppBar(        color: Colors.white,        shape: CircularNotchedRectangle(),        child: Row(          mainAxisAlignment: MainAxisAlignment.spaceAround,          children: [            BottomBarItem(_selectedIndex == 0, 'assets/tabs/home.png', '首页',                    () {                  _onItemTapped(0);                }),            BottomBarItem(_selectedIndex == 1, 'assets/tabs/found.png', '发现',                    () {                  _onItemTapped(1);                }),            SizedBox(              width: 30,            ),            BottomBarItem(_selectedIndex == 2, 'assets/tabs/message.png', '消息',                    () {                  _onItemTapped(2);                }),            BottomBarItem(_selectedIndex == 3, 'assets/tabs/my.png', '我的', () {              _onItemTapped(3);            })          ],        ),      ),      body: pages[_selectedIndex],      floatingActionButton: FloatingActionButton(        heroTag: 'circleTag',        backgroundColor: AppTheme.mainColor,        child: Column(mainAxisAlignment: MainAxisAlignment.center, children: [          Image(            image: AssetImage('assets/tabs/add.png'),            width: 30,            height: 30,            color: Colors.white,          ),        ]),        onPressed: () {},      ),      floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,    );  }
  void _onItemTapped(int index) {    setState(() {      _selectedIndex = index;    });  }}

import 'package:flutter/material.dart';import 'package:flutter_songbei/app_theme.dart';
class HomeTab extends StatefulWidget {  @override  State createState() {    return _PageState();  }
}
class _PageState extends State<HomeTab>{  @override  Widget build(BuildContext context) {    return Scaffold(      appBar: AppBar(        title: Text('首页'),        backgroundColor: AppTheme.mainColor,      ),    );  }}

import 'package:flutter/material.dart';
class BottomBarItem extends StatelessWidget{
  Color actionColor = Colors.black87;  Color menuColor = Color(0xff707070);
  bool isSelect;  String assetName;  String title;  Function onItem;  BottomBarItem(this.isSelect,this.assetName,this.title,this.onItem);  @override  Widget build(BuildContext context) {    return Container(      padding: EdgeInsets.fromLTRB(0, 5, 0, 5),      height: 60,      child: InkWell(        child: Column(          children: [            Image(              image: AssetImage(assetName),              color: isSelect?actionColor:menuColor,              width: 28,              height: 28,            ),            Text(title,                style: TextStyle(                    color:isSelect?actionColor:menuColor                )            )          ],        ),        onTap: (){          this.onItem();        },      ),    );  }
}