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| import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
// TODO: implement build
return new MaterialApp(
title: "flutter demo",
theme: ThemeData(
primarySwatch: Colors.lightBlue //primarySwatch ：现在支持18种主题样本。
),
home: _home(),
);
}
}
class _home extends StatefulWidget {
@override
State<StatefulWidget> createState() {
// TODO: implement createState
return _homeState();
}
}
class _homeState extends State<_home> {
List<Widget> _viewList; //创建视图数组
int _index = 0; //数组索引，通过改变索引值改变视图
@override
void initState() {
super.initState();
_viewList = List();
_viewList..add(EachView("HOME"))..add(EachView("CLOCK"));
}
_openNewPage() {
Navigator.of(context)
.push(MaterialPageRoute(builder: (BuildContext context) {
return EachView("new Pager");
}));
}
@override
Widget build(BuildContext context) {
// TODO: implement build
return new Scaffold(
floatingActionButton: FloatingActionButton(
onPressed: _openNewPage,
child: Icon(
Icons.add,
color: Colors.white,
)),
floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
//和底栏进行融合
bottomNavigationBar: BottomAppBar(
color: Colors.lightBlue, //底部工具栏的颜色。
shape: CircularNotchedRectangle(),
//设置底栏的形状，一般使用这个都是为了和floatingActionButton融合，
// 所以使用的值都是CircularNotchedRectangle(),有缺口的圆形矩形。
child: Row(
//里边可以放置大部分Widget，让我们随心所欲的设计底栏
mainAxisAlignment: MainAxisAlignment.spaceAround,
mainAxisSize: MainAxisSize.max,
children: <Widget>[
IconButton(
icon: Icon(
Icons.home,
color: Colors.white,
),
color: Colors.white,
onPressed: () {
setState(() {
_index = 0;
});
},
),
IconButton(
icon: Icon(Icons.access_alarms, color: Colors.white),
color: Colors.white,
onPressed: () {
setState(() {
_index = 1;
});
},
),
],
),
),
body: _viewList[_index],
);
}
}
//子页面
//代码中设置了一个内部的_title变量，这个变量是从主页面传递过来的，然后根据传递过来的具体值显示在APP的标题栏和屏幕中间。
class EachView extends StatefulWidget {
String _title;
EachView(this._title);
@override
_EachViewState createState() => _EachViewState();
}
class _EachViewState extends State<EachView> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text(widget._title)),
body: Center(child: Text(widget._title)),
);
}
}
|
