开课吧全栈架构师期完结瑞客flutter-day3

!utter!utter3..:initialRouteinitialRoute显示失败，也该显示该Widget。:initialRouteinitialRoute显示失败，也该显示该Widget。:routes:Map<String,WidgetBuilder>类型，初化路由:.appBar：显示在界面顶部的一个AppBarbodyWidgetclassMyAppextendsStatelessWidget{Widgetbuild(BuildContextcontext){returnMaterialApp(title:'Fluttertheme:ThemeData(primarySwatch:Colors.blue,home:Scaffold(appBar:AppBar(title:Texttheme:ThemeData(primarySwatch:Colors.blue,home:Scaffold(appBar:AppBar(title:Text('首页//centerTitle:drawer:Drawer(child:Column(children:<Widget>[DrawerItem(1'选项1'),DrawerItem(2'选项2'),DrawerItem(3'选项3'),DrawerItem(4'选项4'),DrawerItem(5,'选项5')bottomNavigationBar:BottomNavigationBar(type:BottomNavigationBarType.fixed,currentIndex:1,items:icon:Ico(Icon.account_balance),title:Text('标题一icon:Icon(Icon.contact),title:Text('标题二title:Text('标题三icon:Icon(Iconchild:Text(THISISBOD.ThemeWidgetThemeWidget可以在App的某个部分使用MaterialApp将Theme做为根widget了。Brightnessbrightness,//深色还是浅色MaterialColorprimarySwatch,//主题颜色样本ColorprimaryColor,//主色，决定导航栏颜色newMaterialApp(title:title,theme:newMaterialApp(title:title,theme:newThemeData(brightness:Brightness.dark,primaryColor:Colors.lightBlue[80newdata:newThemeData(accentColor:Color.yllow,child:newText('HellocopyWith方法。newdata:Theme.of(context).copyWith(accentColor:Colors.yellow),child:newText('usecopyWithmethod'),.ColoraccentColor,//次级色，决定大多数Widget的颜色，如进度条、开关等。ColorcardColor,//卡片颜色ColordividerColor,//分割线颜色ButtonThemeDatabuttonTheme,//按钮主题ColorcursorColor,//输入框光标颜色ColordialogBackgroundColor,//对话框背景颜色StringfontFamily,//文字字体TextThemetextTheme,//字体主题，包括标题、body等文字样式IconThemeDataiconTheme,//Icon的默认样式TargetPlatformplatform,//指定平台，应用特定平台控件风格crossAxisSpacing10.0crossAxisSpacing10.0,//垂直子WidgetmainAxisSpacing://GridViewpadding:crossAxisCount2,//子WidgetchildAspectRatio:childrenwidgetList(),itemCount://SliverGridDelegateWithFixedCrossAxisCount构一gridDelegate:crossAxisCount3,//mainAxisSpacing:crossAxisSpacing10.0,//子组件宽高长度childAspectRatio:itemBuilder:(BuildContextcontext,intindex)//WidgetFunction(BuildContextcontext,intindex)returngetItemContainer(datas[index]);itemCount:itemBuilder:(BuildContextcontext,intindex){returngetItemContainer(datas[index]);gridDelegate:maxCrossAxisExtent:200,mainAxisSpacing:20.0,//垂直单个子WidgetcrossAxisSpacing:SliverGridDelegateWithMaxCrossAxisExtent而言，水平方向元素个数不再maxCrossAxisExtent和屏幕的宽度以及mainAxisSpacing:20.0,//垂直单个子WidgetcrossAxisSpacing:SliverGridDelegateWithMaxCrossAxisExtent而言，水平方向元素个数不再maxCrossAxisExtent和屏幕的宽度以及Widgetbuild(BuildContextcontext){List<String>datas=getDataList();returnGridView.custom(gridDelegate:SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount:3,mainAxisSpacing:10.0,crossAxisSpacing:20.0,childrenDelegate:SliverChildBuilderDelegate((cotext,position){return},childCount:ollVw：可滑动的viw，类似于原生和RN中的ollViw，其只能包含一个子元素ClampingScrollPhysics!Android/child