Flutter之自定义底部导航条以及页面切换实例——Flutter基础系列_flutter tabbar 横线

需求：

底部导航条以及页面切换功能的实现。

效果图:

 

在这个过程中，我创建了一个tab.dart, 首页是home.dart,消息页是message.dart,设置页是setting.dart。

 

tab.dart:

import 'package:flutter/material.dart';
import 'home.dart';
import 'message.dart';
import 'setting.dart';
 
class tab extends StatefulWidget {
  @override
  _tabState createState() => _tabState();
}
 
class _tabState extends State<tab> {
  int currentIndex=0;
  List _pageList=[
    Home(),
    Message(),
    Setting(),
  ];
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
          title: Text("hello word")
      ),
      body: this._pageList[this.currentIndex],
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: this.currentIndex,
        onTap: (int index){
          setState(() {
            this.currentIndex=index;
          });
        },
        items: [
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            title: Text("首页"),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.add_comment),
            title: Text("消息"),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.settings),
            title: Text("設置"),
          ),
        ],
        fixedColor: Colors.blue,
      ),
    );
  }
}

home.dart

import 'package:flutter/material.dart';
 
class Home extends StatefulWidget {
  @override
  _HomeState createState() => _HomeState();
}
 
class _HomeState extends State<Home> {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Center(
      child: Text("首页"),
    );
  }
 
}

message.dart

import 'package:flutter/material.dart';
 
class Message extends StatefulWidget {
  @override
  _MessageState createState() => _MessageState();
}
 
class _MessageState extends State<Message> {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Center(
      child: Text("消息页"),
    );
  }
 
}

setting.dart

import 'package:flutter/material.dart';
 
class Setting extends StatefulWidget {
  @override
  _SettingState createState() => _SettingState();
}
 
class _SettingState extends State<Setting> {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Center(
      child: Text("设置页"),
    );
  }
 
}

然后就完成了，最后将tab.dart放到MateriaApp中的home中就行，如下图：

顶部导航栏参数配置

在TabBar中与tabs同级设置

              isScrollable: false,   //是否可滚动
              indicatorColor: Colors.red,  //bar的下划线指示器选中颜色
              indicatorWeight: 3, //bar的下划线指示器的高度
              indicatorPadding:  EdgeInsets.all(8.0),  //bar的下划线指示器的padding
              labelColor: Colors.yellow,  //标签文字颜色
              indicatorSize: TabBarIndicatorSize.label, //下划线指示器与标签文字等宽,默认为tab与bar等宽
              labelStyle: TextStyle(), //标签文字样式
              labelPadding:  EdgeInsets.only(left: 8.0), //标签文字padding
              unselectedLabelColor: Colors.white,   //未选中文字标签颜色
              unselectedLabelStyle: TextStyle(),  //未选中文字标签样式

基础篇

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Flutter之自定义底部导航条以及页面切换实例——Flutter基础系列

Flutter之自定义顶部Tab——Flutter基础系列

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Flutter之自定义按钮RaisedButton、OutlineButton、IconButton等——Flutter基础系列