Flutter实现顶部导航栏功能

本文实例为大家分享了Flutter实现顶部导航栏的具体代码，供大家参考，具体内容如下import'package:flutter/material.dart';classAppBarDemoPag...

本文实例为大家分享了Flutter实现顶部导航栏的具体代码，供大家参考，具体内容如下

import 'package:flutter/material.Dart';
class AppBarDemoPage extends StatelessWidget {
 const AppBarDemoPage({Key key}) : super(key: key);

 @override
 Widget build(BuildContext context) {
  return DefaultTabController(
  //导航栏的长度
   length: 4,
   child: Scaffold(
    appBar: AppBar(
     title: Text("AppBarDemoPage"),
     backgroundCowww.cppcns.comlor: Colors.red,
     centerTitle: true,
     bottom: TabBar(
      // isScrollable: true, //可滚动
      indicatorColor: Colors.blueGrey, //指示器的颜色
      labelColor: Colors.blueGrey, //选中文字颜色
      unselectedLabelColor: Colors.white, //为选中文字颜色
      // indicatorSize: TabBarIndicatorSize.label, //指示器与文字等宽
      tabs: <Widget>[
       Tab(text: "热门"),
       Tab(text: "推荐"),
       Tab(text: "好友"),
       Tab(text: "动态"),
      ],
     ),
    ),
    body: TabBarView(
     children: <Widget>[
      Container(
       child: Text("hello"),
      ),
      ListView(
       children: <Widget>[
        ListTile(
         title: Text("第二个tab"),
        )
       ],
      ),
      ListView(
       children: <Widget>[
        ListTile(
         title: Text("第三个tab"),
        )
       ],
      ),
      ListView(
       children: <Widget>[
        ListTile(
         title: Text("第四个tab"),
        )
       ],
      ),
     ],
    ),
   ),
  );
 }
}

如果底部导航栏和顶部导航栏同时存在的

在这里只写顶部导航栏的实现，底部的可以参照我之前的文章

tabbar导航栏的实现

import 'package:flutter/material.dart';

class CategoryPage extends StatefulWidget {
 CategoryPage({Key key}) : super(key: key);

 @override
 _CategoryPageState createState() => _CategoryPageState();
}

class _CategoryPageState extends State<CategoryPage> {
 @override
 Widget build(BuildContext context) {
  return DefaultTabController(
   length: 4,
   child: Scaffold(
 编程   appBar: AppBar(
     title: Row(
      children: <Widget>[
       Expanded(
        child: TabBar(
         tabs: <Widget>[
          Tab(text: "精选"),
          Tab(text: "电影"),
          Tab(text: "动漫"),
          Tab(text: "NBA"),
         ],
        ),
       )
      ],
     ),
    ),
    body: TabBarView(
     children: <Widget>[
      ListView(
       children: <Widget>[
        ListTile(
         title: Text("第一个tab"),
        )
       ],
      ),
      ListView(
       children: <Widget>[
        ListTile(
         title: Text("第二个tab"),
        )
       ],
      ),
      ListView(
       children: <Widget>[
        ListTile(
         title: Text("第三个tab"),
        )
       ],
      ),
      ListView(
       children: <Widget>[
        ListTile(
         title: Text("第四个tab"),
        )
       ],
      ),
     ],
    ),
   ),
  );
 }
}

这么写是对导航栏点击做的监听，实现效果一样

import 'package:flutter/material.dart';

class NavbarPage extends StatefulWidget {
 NaVBArPage({Key key}) : super(key: key);

 @override
 _NavBarPageState createState() => _NavBarPageState();
}

class _NavBarPageState extends State<NavBarPage>
  with SingleTickerProviderStateMixin {
 TabController _tabController;
 @override
 void initState() {
  super.initState(); //length为导航栏的个数
  _tabController = new TabController(vsync: this, length: 2);
  _tabController.addListener(() {
   print(_tabController.index);//打印点击的索引
  });
 }

 @override
 Widget build(BuildContext context) {
  return Scaffold(
    appBar: AppBar(
     title: Text("NavBar"),
     bottom: TabBar(
      controller: this._tabController,
      tabs: <Widget>[
       Tab(text: "热销"),
       Tab(text: "推荐"),
      ],
     ),
    ),
    body: TabBarView(
     controller: this._tabController,
     children: <Widgjset>[
      Center(child: Text("热销")),
      Center(child: Text("推荐"))
     ],
    ));
 }
}

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我们。