如何在一个以上的屏幕中保持自定义窗口小部件的通用性

问题描述

我正在制作一个Flutter应用程序，其中我需要两个放置一个在多个屏幕上都通用的小部件.这是屏幕一的构建方法的代码

I am making a flutter application in which I need two put a widget which is common for more than one screen. Here is the code of build method of screen one

  Widget build(BuildContext context) {

    return Scaffold(
      backgroundColor: app_color,
        body: _isLoading == false ? Stack(


          new Container(//used for whole screen ),
            Positioned(
              left: 0,
                    right: 0,
                    bottom: 0,
              //a bottom tab like which is common across screens
            ),

          ],
        )
      :
          //code to show progress indicator while loading data in background 
            Stack(
              children: <Widget>[
                Center(
                    child:Container(
                      height: 50,
                      width: 50,
                      child: CircularProgressIndicator(),
                    )
                ),
                Positioned(
                    left: 0,
                    right: 0,
                    bottom: 0,
                    //keep this to show bottom tab while loading 
                ),
              ],
            )


    );
  }

上面的代码在屏幕底部有一个定位的小部件，我想在多个屏幕上保持通用吗?我该如何实现?我了解android，在那种情况下我可以实现使用片段事务，但是在这里我必须将底部定位的小部件保持在所有屏幕上，问题是在更改屏幕底部位置小部件后消失了一段时间，但我希望该底部小部件保持静态，仅更改屏幕，而不更改底部的小部件

Above code has a positioned widget at the bottom of the screen which I want to keep common across more than one screen? How can I achieve it? I have knowledge of android and in that case I can achieve using fragment transaction but here I have to keep the bottom positioned widget across all screen and the problem with this is that after changing screen bottom position widget disappears for some time but I want that bottom widget to be kept static and change only the screen not bottom positioned widget

推荐答案

您可以做两件事之一

创建一个名为common_view.dart的文件，然后向其中添加视图

create a file called common_view.dart and add the view to it

import 'package:flutter/material.dart';

class CommonBottom extends StatelessWidget {
  CommonBottom();

  @override
  Widget build(BuildContext context) {
    return Positioned(
      left: 0,
      right: 0,
      .......
    );
  }

}

然后在所有页面中将其用作CommonBottom()

Then use it in all your pages as CommonBottom()

为您需要的每个页面创建一个有状态的窗口小部件，并将其呈现在您的页面内部，并用可见性窗口小部件将其包裹起来.

create a stateful widget for every page you need and render it inside your page wrapping it with a visibility widget.

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