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[英]Flutter How to check if Sliver AppBar is expanded or collapsed?
[英]Flutter How to vertically center the AppBar sliver tilte?
我試圖將Sliver AppBar的標題居中,並在此下方添加第二個文本。 我做不到。
下面是現在的圖像以及應該如何顯示。
誰能幫我?
這是我的代碼。
import 'package:flutter/material.dart';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Slive AppBar',
theme: new ThemeData(
primarySwatch: Colors.blue,
),
debugShowCheckedModeBanner: false,
home: new MyHomePage(title: 'Slive AppBar'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return new Scaffold(
drawer: new Drawer(),
body: new CustomScrollView(
scrollDirection: Axis.vertical,
slivers: <Widget>[
new SliverAppBar(
expandedHeight: 150.0,
flexibleSpace: const FlexibleSpaceBar(
title: const Text("US\$ 123.456.78"),
centerTitle: true,
),
backgroundColor: Colors.redAccent,
pinned: true,
actions: <Widget>[
new IconButton(
icon: const Icon(Icons.add_circle),
tooltip: 'Balance',
onPressed: () {/* ... */},
),
],
),
],
));
}
}
“”“”“”“”“”“”“”“”“”“”“”“”“”“”“”“”“”“”“”“”“”“”“”“”“”“” “”“”“”
您可以使用所需的children
創建“ Column
小部件:
return new Scaffold(
drawer: new Drawer(),
body: new CustomScrollView(
scrollDirection: Axis.vertical,
slivers: <Widget>[
new SliverAppBar(
expandedHeight: 140.0,
flexibleSpace: FlexibleSpaceBar(
title: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
mainAxisAlignment: MainAxisAlignment.start,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
const Text("US\$ 123.456.78", textAlign: TextAlign.center,),
const Text("Anything", style: TextStyle(fontSize: 12.0),textAlign: TextAlign.center,),
],
),
centerTitle: true,
),
backgroundColor: Colors.redAccent,
pinned: true,
actions: <Widget>[
new IconButton(
icon: const Icon(Icons.add_circle),
tooltip: 'Balance',
onPressed: () {/* ... */},
),
],
),
],
));
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