[移动开发]Flutter NavigationBar(Tabbar)

移除 状态栏底色

main.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_trip/navigator/tabNavigator.dart';

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

class MyApp extends StatelessWidget {
  // SystemUiOverlayStyle uiStyle = SystemUiOverlayStyle.light.copyWith(
  //   statusBarColor: Colors.transparent,
  // );

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    //设置状态栏背景透明
    SystemChrome.setSystemUIOverlayStyle(SystemUiOverlayStyle.light.copyWith(
      statusBarColor: Colors.transparent,
    ));
    //强制竖屏
    SystemChrome.setPreferredOrientations(
      [DeviceOrientation.portraitUp, DeviceOrientation.portraitDown],
    );
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: TabNavigator(),
    );
  }
}

bottomNavigationBar 配置

?tabNavigator.dart

import 'package:flutter/material.dart';
import 'package:flutter_trip/pages/home/tabHome.dart';
import 'package:flutter_trip/pages/mine/tabMine.dart';
import 'package:flutter_trip/pages/search/tabSearch.dart';
import 'package:flutter_trip/pages/travel/tabTravel.dart';

class TabNavigator extends StatefulWidget {
  @override
  _TabNavigatorState createState() => _TabNavigatorState();
}

class _TabNavigatorState extends State<TabNavigator> {
  final List<Map> navigationBarArray = [
    {
      'title': '首页',
      'icon': Icons.home,
      'colorDefault': Colors.grey,
      'colorSelect': Colors.blue
    },
    {
      'title': '搜索',
      'icon': Icons.search,
      'colorDefault': Colors.grey,
      'colorSelect': Colors.blue
    },
    {
      'title': '旅拍',
      'icon': Icons.camera,
      'colorDefault': Colors.grey,
      'colorSelect': Colors.blue
    },
    {
      'title': '我的',
      'icon': Icons.account_circle,
      'colorDefault': Colors.grey,
      'colorSelect': Colors.blue
    }
  ];

  int tabIndexCurrent = 0;

  final PageController pageController = PageController(initialPage: 0);
  // _TabNavigatorState({Key? key, required this.pageController})
  //     : super(key: key);
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      body: PageView(
        controller: pageController,
        children: [
          TabHome(),
          TabSearch(),
          TabTravel(),
          TabMine(),
        ],
      ),
      bottomNavigationBar: BottomNavigationBar(
          currentIndex: tabIndexCurrent,
          type: BottomNavigationBarType.fixed,
          onTap: (index) {
            pageController.jumpToPage(index);
            setState(() {
              tabIndexCurrent = index;
            });
          },
          items: navigationBarArray
              .asMap()
              .map(
                (index, item) => MapEntry(
                    index,
                    BottomNavigationBarItem(
                        title: Text(
                          item['title'],
                          style: TextStyle(
                              color: index == tabIndexCurrent
                                  ? item['colorSelect']
                                  : item['colorDefault']),
                        ),
                        icon: Icon(
                          item['icon'],
                          color: item['colorDefault'],
                        ),
                        activeIcon: Icon(
                          item['icon'],
                          color: item['colorSelect'],
                        ))),
              )
              .values
              .toList()),
    );
  }
}

上拉显示导航栏： swiper 插件

flutter_swiper_null_safety | Flutter Package

flutter_swiper_null_safety: ^1.0.2

tabHome.dart

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

class TabHome extends StatefulWidget {
  @override
  _TabHomeState createState() => _TabHomeState();
}

class _TabHomeState extends State<TabHome> {
  final List imageArray = [
    'https://tenfei05.cfp.cn/creative/vcg/800/new/VCG21gic13899040.jpg',
    'https://tenfei05.cfp.cn/creative/vcg/800/new/VCG21gic17808815-ZKZ.jpg',
    'https://alifei01.cfp.cn/creative/vcg/800/version23/VCG21gic5474093.jpg',
    'https://tenfei03.cfp.cn/creative/vcg/800/version23/VCG41159337470.jpg',
    'https://tenfei04.cfp.cn/creative/vcg/800/version23/VCG41162310340.jpg',
    'https://tenfei04.cfp.cn/creative/vcg/800/version23/VCG41147366616.jpg'
  ];
  double appBarOpacity = 0;

  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      body: Stack(
        children: [
          MediaQuery.removePadding(
            removeTop: true,
            context: context,
            child: NotificationListener(
              onNotification: (ScrollNotification scrollNotification) {//不光监听父widget 还监听子widget监听
                //列表滚动 并且只监听外部元素；
                if (scrollNotification is ScrollUpdateNotification &&
                    scrollNotification.depth == 0) {
                  _onScroll(scrollNotification.metrics.pixels);
                }
                return true;
              },
              child: ListView(
                children: [
                  Container(
                    height: 160,
                    child: Swiper(
                      autoplay: true,
                      itemCount: imageArray.length,
                      itemBuilder: (BuildContext content, int index) {
                        return Image.network(
                          imageArray[index],
                          fit: BoxFit.fill,
                        );
                      },
                      pagination: SwiperPagination(
                        builder: DotSwiperPaginationBuilder(
                          size: 6,
                          activeSize: 6,
                        ),
                      ),
                    ),
                  ),
                  Container(
                    height: 1888,
                    child: ListTile(
                      title: Text('哈哈'),
                    ),
                  )
                ],
              ),
            ),
          ),
          Opacity(
            opacity: appBarOpacity,
            child: Container(
              height: 80,
              decoration: BoxDecoration(
                color: Colors.white,
              ),
              child: Center(
                child: Padding(
                  padding: EdgeInsets.only(top: 20),
                  child: Text('首页'),
                ),
              ),
            ),
          )
        ],
      ),
    );
  }

  bool _onScroll(double pixels) {
    print('---)$pixels');
    double opacity = pixels / 100;
    if (opacity < 0) {
      opacity = 0;
    } else if (opacity > 1) {
      opacity = 1;
    }
    setState(() {
      appBarOpacity = opacity;
    });
    return true;
  }
}

?

• ?可以监听滑动的组件
• 移除安全区域

MediaQuery.removePadding(//移除安全区域
  removeTop: true,
  context: context,
  child: NotificationListener(//可以监听滑动的组件
    onNotification: (ScrollNotification scrollNotification) {//不光监听父widget 还监听子widget监听
      //列表滚动 并且只监听外部元素；
      if (scrollNotification is ScrollUpdateNotification &&
          scrollNotification.depth == 0) {
        _onScroll(scrollNotification.metrics.pixels);
      }
      return true;
    },