效果

实现

先将自动生成的main.dart里面的代码删除，并创建app.dart文件作为app的入口文件

import 'package:flutter/material.dart';
import 'package:flutter_guohe/pages/main.dart';void main() {runApp(new Guohe());
}复制代码

创建main.dart作为首页的页面文件

class Guohe extends StatefulWidget {@overrideGuoheState createState() => new GuoheState();
}class GuoheState extends State<Guohe> {@overrideWidget build(BuildContext context) {}
}
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创建today.dart、kb.dart、playground.dart三个页面文件作为tabview的填充文件，这里用playground.dart为例。

import 'package:flutter/material.dart';class Playground extends StatefulWidget {@overridePlaygroundState createState() => new PlaygroundState();
}class PlaygroundState extends State<Playground> {@overrideWidget build(BuildContext context) {return new MaterialApp(home: new Scaffold(appBar: new AppBar(title: new Text("操场"),backgroundColor: Color.fromARGB(255, 119, 136, 213), //设置appbar背景颜色centerTitle: true, //设置标题是否局中),body: new Center(child: new Text('操场'),),),);}
}
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main.dart的完整代码

/*** APP的主入口文件*/import 'package:flutter/material.dart';import 'package:flutter_guohe/pages/main/today.dart';
import 'package:flutter_guohe/pages/main/playground.dart';
import 'package:flutter_guohe/pages/main/kb.dart';
import 'package:flutter_guohe/pages/main/leftmenu.dart';import 'package:flutter_guohe/common/eventBus.dart';//果核的主界面
class Guohe extends StatefulWidget {@overrideGuoheState createState() => new GuoheState();
}class GuoheState extends State<Guohe> with SingleTickerProviderStateMixin {TabController controller;@overridevoid initState() {controller = new TabController(length: 3, vsync: this);}@overridevoid dispose() {controller.dispose();super.dispose();}@overrideWidget build(BuildContext context) {return new MaterialApp(home: new Scaffold(drawer: new LeftMenu(),body: new TabBarView(controller: controller,children: <Widget>[new Today(),new Kb(),new Playground(),],),bottomNavigationBar: new Material(color: Colors.white,child: new TabBar(controller: controller,labelColor: Colors.deepPurpleAccent,unselectedLabelColor: Colors.black26,tabs: <Widget>[new Tab(text: "今日",icon: new Icon(Icons.brightness_5),),new Tab(text: "课表",icon: new Icon(Icons.map),),new Tab(text: "操场",icon: new Icon(Icons.directions_run),),],),),),);}
}
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其中

labelColor: Colors.deepPurpleAccent,
unselectedLabelColor: Colors.black26,
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第一个属性是控制标签颜色，这里我选了紫色，第二个属性是未选中标签时的颜色。