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派大星⭐ 人气:0

scafford的bottomNavigationBar参数赋值BottomAppBar可以实现,BottomAppBar比BottomNavigationBar灵活,在body参数之外准备好一个fab,使用BottomAppBar的shape属性设置BottomAppBar为一个挖了圆形的矩形,设置fab的位置便可;

main:

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_app/EachView.dart';
import 'package:flutter_app/NewPage.dart';

void main(){
  runApp(MyApp());
}
class MyApp extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    // throw UnimplementedError();
    return new MaterialApp(
      theme: ThemeData(
        primarySwatch:Colors.lightBlue//fab的颜色
      ),
      home: MyNavigationBar(),
    );
  }

}
class  MyNavigationBar extends StatefulWidget{

  @override
  MyNavigationBarState createState() {
    // TODO: implement createState
    // throw UnimplementedError();
    return new MyNavigationBarState();
  }

}
class MyNavigationBarState extends State<MyNavigationBar>{
  List<Widget> _list;
  int _index=0;

  @override
  void initState() {
    _list=[];
    _list..add(EachView(title: "0",))..add(EachView(title: "1",));
  }

  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    // throw UnimplementedError();
    return new Scaffold(

      floatingActionButton: FloatingActionButton(//注意:如果想要fab放在默认的位置,是放在scafford的floatingactionbar参数的,而不是放在body
        onPressed: (){
          Navigator.push(context, MaterialPageRoute(builder: (BuildContext context){
            return new NewPage();
          }));
        },
        child: Icon(Icons.add,color: Colors.white,),
      ),
      floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,//设置fab的位置
      body: _list[_index],
      bottomNavigationBar: BottomAppBar(
        color: Colors.amber,
        shape: CircularNotchedRectangle(),//让bottomAppBar是一个挖了圆形的矩形
        child: Row(
          mainAxisAlignment: MainAxisAlignment.spaceAround,//首尾的宽度等于中间宽度的一半
          mainAxisSize: MainAxisSize.max,//表示占满整个宽度,如果是min表示包裹子控件
          children: [
            IconButton(
              icon: Icon(Icons.home,color: Colors.lightBlue,),
              onPressed: (){
                setState(() {
                  _index=0;
                });
              },
            ),
            IconButton(
              icon: Icon(Icons.photo,color: Colors.lightBlue,),
              onPressed: (){
                setState(() {
                  _index=1;
                });
              },
            ),

          ],
        ),
      ),
    );
  }

}

EachView:

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

class EachView extends StatelessWidget{
  final String title;

  const EachView({Key key, this.title}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    // throw UnimplementedError();
    return new Scaffold(
      body: Center(
        child: Text("$title"),
      ),
    );
  }

}

NewPage:

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

class NewPage extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    // throw UnimplementedError();
    return new Scaffold(
      body: Center(
        child: Text("NewPage"),
      ),
    );
  }

}

效果:

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