自定义TabBar

# Flutter自定义TabBar

# 1. 创建tab_navigator.dart文件

import 'package:flutter/material.dart';
import 'package:flutter_trip/pages/home_page.dart';
import 'package:flutter_trip/pages/my_page.dart';
import 'package:flutter_trip/pages/search_page.dart';
import 'package:flutter_trip/pages/travel_page.dart';
import 'package:flutter_trip/utils/theme_color.dart';

class TabNavigator extends StatefulWidget {
  const TabNavigator({Key? key}) : super(key: key);

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

class _TabNavigatorState extends State<TabNavigator> {
  // 默认字体颜色
  final _defaultColor = WZThemeColor.text2Color;

  // 选中颜色
  final _activeColor = WZThemeColor.primaryColor;

  // 页面控制器
  final PageController _controller = PageController(initialPage: 0);

  // 当前界面索引记录
  int _currentIndex = 0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: PageView(
          // PageView组件
          controller: _controller,
          // 控制器绑定
          children: const [HomePage(), SearchPage(), TravelPage(), MyPage()],
          // 子页面列表
          onPageChanged: (int valueChanged) {
            // 监听界面改变
            setState(() {
              if (_currentIndex != valueChanged) {
                // 当界面改变时改变当前界面索引
                _currentIndex = valueChanged;
              }
            });
          }),
      // 底部导航栏
      bottomNavigationBar: BottomNavigationBar(
        // 关联当前相应索引
        currentIndex: _currentIndex,
        // 监听点击事件
        onTap: (index) {
          // 页面控制器跳转到点击的界面
          _controller.jumpToPage(index);
          // 设置当前选中索引
          setState(() {
            _currentIndex = index;
          });
        },
        // BottomNavigationBarType有两种类型，fixed:一直显示文字；shifting：仅选中的Item显示文字
        type: BottomNavigationBarType.fixed,
        // 设置Item选中的颜色
        selectedItemColor: _activeColor,
        // 设置Item选中的字体
        selectedFontSize: 12.0,
        // 设置未选中Item的颜色
        unselectedItemColor: _defaultColor,
        // 子选项
        items: [
          BottomNavigationBarItem(
              icon: Icon(Icons.home, color: _defaultColor),
              activeIcon: Icon(Icons.home, color: _activeColor),
              label: '首页'),
          BottomNavigationBarItem(
              icon: Icon(Icons.search, color: _defaultColor),
              activeIcon: Icon(Icons.search, color: _activeColor),
              label: '搜索'),
          BottomNavigationBarItem(
              icon: Icon(Icons.camera_alt, color: _defaultColor),
              activeIcon: Icon(Icons.camera_alt, color: _activeColor),
              label: '旅拍'),
          BottomNavigationBarItem(
              icon: Icon(Icons.account_circle, color: _defaultColor),
              activeIcon: Icon(Icons.account_circle, color: _activeColor),
              label: '我的')
        ],
      ),
    );
  }
}

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# 2. 在main.dart中引入tab_navigator.dart

import 'package:flutter/material.dart';

import 'navigator/tab_navigator.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
          primarySwatch: Colors.blue,
          highlightColor: const Color.fromRGBO(0, 0, 0, 0),
          splashColor: const Color.fromRGBO(0, 0, 0, 0)),
      home: const TabNavigator(),
    );
  }
}

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上次更新: 10/29/2021, 4:56:25 PM

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