[英]How to remove the second appbar in Flutter
我正在嘗試使用Flutter
構建一個演示聊天應用程序。 在我的主屏幕之后,我使用Navigator.push
轉到詳細信息屏幕。 問題截圖:
第一屏的構建方法:
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text("Chat Thread App"),
actions: <Widget>[
IconButton(
icon: Icon(Icons.settings),
onPressed: () {
Navigator.pushNamed(context, '/settings');
},
)
],
),
body: isLoading
? Center(
child: CircularProgressIndicator(),
)
: new ChatThreadListCard(messageThreads: _messageThreadLists, user: _user,),
);
}
Navigator.push
方法的代碼:
Navigator.push(context, MaterialPageRoute(
builder: (context) => ChatDetailsScreen(threadModel: new ThreadModel(
user.id,
user.fullName,
user.pic,
"otherId",
"otherName",
"otherPic",
post.threadId
)
),
),);
生成問題的第二個屏幕的構建方法:
return Scaffold(
appBar: AppBar(
title: Text("Chat demo"),
),
body: WillPopScope(
child: isLoading
? Center(
child: CircularProgressIndicator(),
)
: Stack(
alignment: AlignmentDirectional.bottomCenter,
children: <Widget>[
SizedBox(
width: 300,
height: 300,
),
Column(
children: <Widget>[
buildChat(),
buildInput(),
],
)
],
),
onWillPop: onBackPress,
),
);
問題原來是,我在腳手架的主體中創建了一個 MaterialApp 小部件。 因此,當 onTap 方法被調用時,新屏幕被替換為 MaterialApp 的區域。 沒有更換整個屏幕。
訣竅是刪除return new MaterialApp()
。
謝謝大家。
我猜你設置Material App
?
app.dart:
class App extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: HomePage());
}
}
home_page 和 second_page
import 'package:flutter/material.dart';
class HomePage extends StatefulWidget {
@override
State createState() => HomePageState();
}
class HomePageState extends State<HomePage> with TickerProviderStateMixin {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('First Page'),
),
body: Container(
child: Center(child: RaisedButton(child: Text('Forward'), onPressed: () async {
await Navigator.push(context, MaterialPageRoute(builder: (context) => SecondPage()));
},)),
));
}
}
class SecondPage extends StatefulWidget {
@override
State createState() => SecondPageState();
}
class SecondPageState extends State<SecondPage> with TickerProviderStateMixin {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Second Page'),
),
body: Container(
child: Center(child: RaisedButton(child: Text('Backward'), onPressed: () {
Navigator.of(context).pop();
},)),
));
}
}
其中產生:
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