logistics-client-flutter/lib/home_page.dart

import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'pages/order_taking_page.dart';
import 'pages/order_management_page.dart';
import 'pages/send_express_page.dart';
import 'pages/my_page.dart';

class HomePage extends StatefulWidget {
  final Widget child;

  HomePage({
    Key key,
    this.child
  }): super(key: key);

  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State < HomePage > with SingleTickerProviderStateMixin {

  int _currentIndex = 0;
  List < Widget > pageList = [
    OrderTakingPage(),
    OrderManagementPage(),
    SendExpressPage(),
    MyPage()
  ];

  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
     ScreenUtil.instance = ScreenUtil(width: 750, height: 1334,allowFontScaling:false)..init(context);
    return
    Scaffold(
      body: IndexedStack(
        index: _currentIndex,
        children: pageList
      ),
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: _currentIndex,
        type: BottomNavigationBarType.fixed,
        items: [
          BottomNavigationBarItem(
            icon: Image.asset('lib/images/icon_jiedan.png', scale: 1.6, ),
            title: Text('接单', style: TextStyle(color: _currentIndex == 0 ? Color.fromRGBO(64, 98, 254, 1) : Colors.grey, fontSize: ScreenUtil.getInstance().setSp(20)), ),
            activeIcon: Image.asset('lib/images/icon_jiedan01.png', scale: 1.6)
          ),
          BottomNavigationBarItem(
            icon: Image.asset('lib/images/icon_dingdan.png', scale: 1.6),
            title: Text('订单管理', style: TextStyle(color: _currentIndex == 1 ? Color.fromRGBO(64, 98, 254, 1) : Colors.grey, fontSize: ScreenUtil.getInstance().setSp(20)), ),
            activeIcon: Image.asset('lib/images/icon_dingdan01.png', scale: 1.6)
          ),
          BottomNavigationBarItem(
            icon: Image.asset('lib/images/icon_fajian.png', scale: 1.6),
            title: Text('发件', style: TextStyle(color: _currentIndex == 2 ? Color.fromRGBO(64, 98, 254, 1) : Colors.grey, fontSize: ScreenUtil.getInstance().setSp(20)), ),
            activeIcon: Image.asset('lib/images/icon_fajian01.png', scale: 1.6)
          ),
          BottomNavigationBarItem(
            icon: Image.asset('lib/images/icon_wode.png', scale: 1.6),
            title: Text('我的', style: TextStyle(color: _currentIndex == 3 ? Color.fromRGBO(64, 98, 254, 1) : Colors.grey, fontSize: ScreenUtil.getInstance().setSp(20)), ),
            activeIcon: Image.asset('lib/images/icon_wode01.png', scale: 1.6)
          ),
        ],
        onTap: (index) {
          setState(() {
            _currentIndex = index;
          });
          // if(_currentIndex==2){
          //    Navigator.pushReplacement(context, MaterialPageRoute(builder: (context){
          //       return SendExpressPage();
          //     }));
          // }else{
          //}
        },
      ),
    );
  }
}