所有屏幕都需要一个永久/相同的底部导航栏-Flutter [英] Need a persistent/same Bottom Navigation Bar for all screens - Flutter

问题描述

我是初学者，喜欢飞镖和飞镖。我一直在尝试在应用程序的三个不同页面上实现 navigationBar 。对于单个页面，切换效果很好，但是我在将所有页面上的活动和非活动标签状态保持不变时遇到问题。似乎当它导航到另一个页面时，我也失去了选项卡的活动状态。这是我的代码。

I am a beginner with flutter and dart. I have been trying to implement a navigationBar on three different pages in my app. The toggling works well for an individual page but I have problems persisting the active and inactive tabs state on all the pages. It seems like when it navigates to another page, I lose the active state too the tabs. This is my code.

AppFooter.dart

import 'package:flutter/material.dart';

class AppFooter extends StatefulWidget {
  @override
  _AppFooterState createState() => _AppFooterState();
}

class _AppFooterState extends State<AppFooter> {
  int index = 0;
  @override
  Widget build(BuildContext context) {
    return new Theme(
      data: Theme.of(context).copyWith(
          // sets the background color of the `BottomNavigationBar`
          canvasColor: Colors.white,
          // sets the active color of the `BottomNavigationBar` if `Brightness` is light
          primaryColor: Colors.green,
          textTheme: Theme.of(context)
              .textTheme
              .copyWith(caption: new TextStyle(color: Colors.grey))),
      child: new BottomNavigationBar(
          type: BottomNavigationBarType.fixed,
          currentIndex: index,
          onTap: (int index) {
            setState(() {
              this.index = index;
            });
          switch (index){
            case 0:  Navigator.of(context).pushNamed('/dashboard');
            break;
            case 1:  Navigator.of(context).pushNamed('/medical centre');
            break;
            case 2:  Navigator.of(context).pushNamed('/history');
            break;

          }

          },
          items: [
            new BottomNavigationBarItem(
                backgroundColor: Colors.white,
                icon: index==0?new Image.asset('assets/images/dashboard_active.png'):new Image.asset('assets/images/dashboard_inactive.png'),
                title: new Text('Dashboard', style: new TextStyle(fontSize: 12.0))),
           new BottomNavigationBarItem(
               backgroundColor: Colors.white,
               icon: index==1?new Image.asset('assets/images/medical_sevice_active.png'):new Image.asset('assets/images/medical_sevice_inactive.png'),
               title: new Text('Health Services', style: new TextStyle(fontSize: 12.0))),
            new BottomNavigationBarItem(
                icon: InkWell(
                  child: Icon(
                    Icons.format_align_left,
                   // color: green,
                    size: 20.0,
                  ),
                ),
                title: new Text('History', style: new TextStyle(fontSize: 12.0))),
          ]),
    );
  }
}

推荐答案

如果我正确理解了您的问题，您需要在所有三个页面上都保留底部导航栏。关于如何实现这一点，有一篇写得很好的文章。您可以在此处找到详细信息。

If I understand your question correctly, you need the bottom navigation bar persisted on all three pages. There is a well-written article on how to achieve it. You can find the details here.

https://medium.com/coding-with-flutter/flutter-case-study-multiple-navigators-with-bottomnavigationbar-90eb6caa6dbf

https://github.com/bizz84/ nested-navigation-demo-flutter

所有学分归原始作者所有。

All credits go to the original author.

这篇关于所有屏幕都需要一个永久/相同的底部导航栏-Flutter的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！