Fiji/flutter_airplane/lib/code/YSTabbar.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:jpush_flutter/jpush_flutter.dart';
import 'package:shared_preferences/shared_preferences.dart';

class YSTabbar extends StatefulWidget {
  @override
  _YSPageState createState() => _YSPageState();
}

class _YSPageState extends State<YSTabbar> {
  int _selectedIndex = 0;
  final JPush jpush = new JPush();
  @override
  void initState() {
    Future<SharedPreferences> _prefs = SharedPreferences.getInstance();
    _prefs.then((value) => {
      if(value.getInt('chapters')==null){
        value.setInt('chapters', 0),
        value.setInt('childId', 1),
      }
    });
    jpush.setup(
      appKey: "5cdf5bc06073b6ba4b3eaf86", //你自己应用的 AppKey
      channel: "theChannel",
      production: false,
      debug: true,
    );
    jpush.applyPushAuthority(
        new NotificationSettingsIOS(sound: true, alert: true, badge: true)
    );
    jpush.getRegistrationID().then((rid) {
      print("flutter get registration id : $rid");
    });
    try {
      jpush.addEventHandler(
          onReceiveNotification: (Map<String, dynamic> message) async {
            print("flutter onReceiveNotification: $message");
          },
          onOpenNotification: (Map<String, dynamic> message) async {
            print("flutter onOpenNotification: $message");
            Navigator.of(context).push(
                CupertinoPageRoute(
                    builder: (context){
                      return null;
                    }
                )
            );
          },
          onReceiveMessage: (Map<String, dynamic> message) async {
            print("flutter onReceiveMessage: $message");
          },
          onReceiveNotificationAuthorization:(Map<String, dynamic> message) async {
            print("flutter onReceiveNotificationAuthorization: $message");
          });
    } on PlatformException {

    }
    super.initState();
  }
  void onItemTap(int index){
    setState(() {
      _selectedIndex = index;
    });
  }
  @override
  Widget build(BuildContext context) {
    return CupertinoTabScaffold(
      tabBar: CupertinoTabBar(
        items: const<BottomNavigationBarItem>[
          BottomNavigationBarItem(
              icon: Icon(Icons.home),
              title: Text('首页')
          ),
          BottomNavigationBarItem(
              icon: Icon(Icons.calendar_today),
              title: Text('行程')
          ),
          BottomNavigationBarItem(
              icon: Icon(Icons.camera),
              title: Text('广场')
          ),
          BottomNavigationBarItem(
              icon: Icon(Icons.person),
              title: Text('我的')
          ),
        ],
        currentIndex: _selectedIndex,
        onTap: onItemTap,
        activeColor: Color(0xFF007AFF),
        inactiveColor: Color(0xFF999999),
        iconSize: 25,
      ),
      tabBuilder: (context,index){
        return CupertinoTabView(
          builder: (context){
            if (index == 0) {
              return null();
            }else if(index == 1){
              return null();
            }else{
              return null();
            }
          },
        );
      },
    );
  }
}