Flutter-Scaffold组件

在Flutter开发当中，我们可能会遇到以下的需求：

实现页面组合使用，比如说有悬浮按钮、顶部菜单栏、左右抽屉侧边栏、底部导航栏等等效果。

Scaffold组件可以帮我们实现上面需求说的效果。这篇博客主要分享容器组件的Scaffold组件的使用，希望对看文章的小伙伴有所帮助。

简单示例代码

Scaffold(
      appBar:AppBar(
        title:Text(widget.title),),
      body:Center(
        child:Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children:<Widget>[constText('You have pushed the button this many times:',),Text('$_counter',
              style: Theme.of(context).textTheme.headline4,),],),),
      backgroundColor: Colors.yellow,
      bottomNavigationBar:BottomAppBar(
        color: Colors.white,
        shape:constCircularNotchedRectangle(),
        child:Container(
          height:50,),),
      floatingActionButton:FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip:'Increment',
        child:constIcon(Icons.add),),
      floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,)

效果如下所示：

image.png

组件源码

组件属性说明

这里针对源码做出相应的属性说明，熟悉控件的属性方便大家的使用。

属性名称	属性说明
backgroundColor	设置容器的背景颜色
appBar	顶部状态栏
body	容器的主体
bottomNavigationBar	顶部导航栏
floatingActionButton	悬浮按钮
floatingActionButtonLocation	悬浮按钮的位置
floatingActionButtonAnimator	悬浮按钮相关的动画设置
drawer	侧边栏组件
persistentFooterButtons	固定在下方显示的按钮

完整的源码

以下的代码，可以直接复制到编译器去运行，方便小伙伴查看运行结果或者直接使用：

import'package:flutter/material.dart';voidmain(){runApp(constMyApp());}classMyAppextendsStatelessWidget{constMyApp({Key? key}):super(key: key);// This widget is the root of your application.@overrideWidgetbuild(BuildContext context){returnMaterialApp(
      title:'Flutter Demo',
      theme:ThemeData(
        primarySwatch:Colors.blue,),
      home:constMyHomePage(title:'Flutter Demo Home Page'),);}}classMyHomePageextendsStatefulWidget{constMyHomePage({Key? key, required this.title}):super(key: key);finalString title;@overrideState<MyHomePage>createState()=>_MyHomePageState();}class _MyHomePageState extendsState<MyHomePage>{int _counter =0;void_incrementCounter(){setState((){
      _counter++;});}@overrideWidgetbuild(BuildContext context){returnScaffold(
      appBar:AppBar(
        title:Text(widget.title),),
      body:Center(
        child:Column(
          mainAxisAlignment:MainAxisAlignment.center,
          children:<Widget>[constText('You have pushed the button this many times:',),Text('$_counter',
              style:Theme.of(context).textTheme.headline4,),],),),
      backgroundColor:Colors.yellow,
      bottomNavigationBar:BottomAppBar(
        color:Colors.white,
        shape:constCircularNotchedRectangle(),
        child:Container(
          height:50,),),
      floatingActionButton:FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip:'Increment',
        child:constIcon(Icons.add),),
      floatingActionButtonLocation:FloatingActionButtonLocation.centerDocked,);}}