project_telephony/lib/ui/tab_navigator.dart

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

import 'package:project_telephony/ui/user/user_page.dart';
import 'package:project_telephony/utils/headers.dart';


import '../utils/hive_store.dart';
import 'home/home_page.dart';

class TabNavigator extends StatefulWidget {
  final int? index;
  const TabNavigator({Key? key, this.index}) : super(key: key);

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

class _TabNavigatorState extends State<TabNavigator>
    with SingleTickerProviderStateMixin {
  TabController? _tabController;
  int _pageIndex = 0;
  DateTime? _lastPressed;

//    页面列表
  List<Widget> _pages = <Widget>[];

  @override
  void initState() {
    super.initState();
    //页面加载调用
    Future.delayed(const Duration(milliseconds: 0), () async {
      //Hive.initFlutter;
      await HiveStore.init();
    });
    _pages = [const HomePage(), const UserPage()];
    _tabController = TabController(
        length: _pages.length, vsync: this, initialIndex: widget.index ?? 0);
  }

  //选中与未选中图标样式
  _buildBottomBar(String title, String unSelected, String selected) {
    return BottomNavigationBarItem(
      icon: Image.asset(
        unSelected,
        height: 44.w,
        width: 44.w,
      ),
      activeIcon: Image.asset(
        selected,
        height: 44.w,
        width: 44.w,
      ),
      label: title,
    );
  }

  @override
  Widget build(BuildContext context) {
    //底部导航来
    List<BottomNavigationBarItem> _bottomNav = <BottomNavigationBarItem>[
      _buildBottomBar("首页", Assets.icons.homeNoSelected.path,
          Assets.icons.homeSelected.path),
      _buildBottomBar(
          "我的", Assets.icons.myNoselected.path, Assets.icons.mySelected.path)
    ];
    return Scaffold(
      body: WillPopScope(
        onWillPop: () async {
          if (_lastPressed == null ||
              DateTime.now().difference(_lastPressed!) >
                  const Duration(seconds: 1)) {
            //两次点击间隔超过1秒重新计算
            _lastPressed = DateTime.now();
            BotToast.showText(text: '再按一次即可退出程序');
            return false;
          }
          // 否则关闭APP
          return true;
        },
        child: TabBarView(
          children: _pages,
          controller: _tabController,
          physics: const NeverScrollableScrollPhysics(),
        ),
      ),
      bottomNavigationBar: BottomNavigationBar(
        items: _bottomNav,
        backgroundColor: Colors.white,
        currentIndex: _pageIndex,
        selectedFontSize: 20.sp,
        unselectedFontSize: 20.sp,
        onTap: (index) {
          _tabController!.animateTo(index, curve: Curves.easeInOutCubic);
          setState(() => _pageIndex = index);
        },
      ),
    );
  }
}