本文实例为大家分享了flutter实现底部导航栏的具体代码,供大家参考,具体内容如下
一 flutter底部导航栏常用组件BottomNavigationBar
本文实例为大家分享了flutter实现底部导航栏的具体代码,供大家参考,具体内容如下
一.flutter底部导航栏常用组件BottomNavigationBar 属性介绍
BottomNavigationBar({ Key? key, required this.items, //必填项,设置各个按钮 this.onTap, //点击事件 this.currentIndex = 0, //当前选中item下标 this.elevation, //控制阴影高度 this.type, //BottomNavigationBarType,默认 fixed,设置为 shifting 时,需要设置选中样式,和未选中样式,提供一个特殊动画 Color? fixedColor, //选中 item 填充色 this.backgroundColor, //整个BottomNavigationBar 背景色 this.iconSize = 24.0, //图标大小 Color? selectedItemColor, //选中title填充色 this.unselectedItemColor, //未选中title填充色 this.selectedIconTheme, //选中item图标主题 this.unselectedIconTheme, //未选中item图标主题 this.selectedFontSize = 14.0, //选中title字体大小 this.unselectedFontSize = 12.0, //未选中title字体大小 this.selectedLabelStyle, //选中title样式 TextStyle this.unselectedLabelStyle, //未选中title样式 TextStyle this.showSelectedLabels, //是否展示选中title,默认为true this.showUnselectedLabels, //是否展示未选中title,默认为true this.mouseCursor, //鼠标悬停 this.enableFeedback, this.landscapeLayout, })
二.BottomNavigationBar的具体实现
1.创建四个页面,分别为,首页,通讯录,发现和我的,这里以homepage.dart为例,其他页面只需要修改对应内容显示即可,eg:
import 'package:flutter/material.dart'; class HomePage extends StatefulWidget{ const HomePage({Key? key}) : super(key: key); @override State<StatefulWidget> createState()=>_HomePageState(); } class _HomePageState extends State<HomePage>{ @override Widget build(BuildContext context) { return const Center( child: Text( "主页", style:TextStyle( color: Colors.black, fontSize: 20 ), ), ); } }
2.添加BottomNavigationBar,需要在主页中实现BottomNavigationBar,eg:
import 'package:flutter/material.dart'; import 'findpage.dart'; import 'mypage.dart'; import 'contactpage.dart'; import 'homepage.dart'; class MainPage extends StatefulWidget{ const MainPage({Key? key}) : super(key: key); @override State<StatefulWidget> createState()=>_MainPageState(); } class _MainPageState extends State<MainPage>{ var allPages=[HomePage(),ContactPage(),FindPage(),MyPage()]; var currentIndex=0; @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text( "导航栏", style: TextStyle( color: Colors.black, fontSize: 30, ), textAlign: TextAlign.center, ), ), body: allPages[currentIndex], backgroundColor: Colors.green, bottomNavigationBar: BottomNavigationBar( currentIndex: currentIndex, type: BottomNavigationBarType.fixed, unselectedItemColor: Colors.grey, selectedItemColor: Colors.blue, /*unselectedLabelStyle:TextStyle( color: Colors.black ),*/ items: [ BottomNavigationBarItem( icon: Icon(Icons.home), label: "首页", //backgroundColor:Colors.blue ), BottomNavigationBarItem( icon: Icon(Icons.person), label: "通讯录", //backgroundColor:Colors.blue ), BottomNavigationBarItem( icon: Icon(Icons.find_in_page), label: "发现", //backgroundColor:Colors.blue ), BottomNavigationBarItem( icon: Icon(Icons.flip_outlined), label: "我的", //backgroundColor:Colors.blue ), ], onTap: (index){ setState(() { print("the index is :$index"); currentIndex=index; }); }, ), ); } }
三.实际效果展示,eg:
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持好代码网。