我想制作一个小部件,粘贴到页面底部,然后固定到键盘顶部(当它出现时)。
注意下图中输入文本字段如何固定到键盘:
我该怎么做?我尝试将其放入
bottomNavigationBar
中,但这(显然)不起作用。有内置的方法可以做到这一点吗?
这是您想要的东西的一个工作示例。我认为! 只需复制/粘贴/运行
这个例子中重要的是扩展。一个非常好的小部件,可以扩展到尽可能多的空间。结果是将聊天框尽可能向下推
(屏幕底部或键盘底部)
import 'package:flutter/material.dart';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Flutter Demo',
theme: new ThemeData(
primarySwatch: Colors.blue,
),
home: new MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
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(
appBar: new AppBar(
title: new Text('49715760 Stackoverflow'),
),
body: new Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
new Expanded(
child: new Material(
color: Colors.red,
child: new Text("Filled"),
),
),
new Container(
color: Colors.white,
padding: new EdgeInsets.all(10.0),
child: new TextField(
decoration: new InputDecoration(
hintText: 'Chat message',
),
),
),
],
),
);
}
}
import 'dart:async';
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
var home = MyHomePage(title: 'Flutter Demo Home Page');
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: home,
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return Scaffold(
resizeToAvoidBottomInset: false,
appBar: AppBar(
title: Text(widget.title),
),
body: _getBody(),
floatingActionButton: FloatingActionButton(
onPressed: () {},
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
Widget _getBody() {
return Stack(children: <Widget>[
Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage("assets/sample.jpg"), fit: BoxFit.fitWidth)),
// color: Color.fromARGB(50, 200, 50, 20),
child: Column(
children: <Widget>[TextField()],
),
),
Positioned(
bottom: MediaQuery.of(context).viewInsets.bottom,
left: 0,
right: 0,
child: Container(
height: 50,
child: Text("Hiiiii"),
decoration: BoxDecoration(color: Colors.pink),
),
),
]);
}
}
使用Scaffold 中的bottomSheet 选项。
Scaffold(
bottomSheet: chatBar(),
body: Column(
children: [
Expanded(
child: ListView()
)
]
)
)
当键盘打开时,聊天栏位于键盘顶部。
对于透明的chatBar:可以通过
包裹ScaffoldTheme(
data: ThemeData.light().copyWith(
bottomSheetTheme: BottomSheetThemeData(backgroundColor: Colors.transparent),
),
有一个库:
https://pub.dev/packages/keyboard_attachable
Widget build(BuildContext context) => FooterLayout(
footer: MyFooterWidget(),
child: PageMainContent(),
);
这对我有用,
showBottomSheet(
context: context,
builder: (context) => Container(
height: // YOUR WIDGET HEIGHT
child: // YOUR CHILD
)
showBottomSheet 是一个 flutter 内置函数。
Padding(
padding:
EdgeInsets.only(bottom: MediaQuery.of(context).viewInsets.bottom*0.04), //modify 0.04 to what suits you
child: TheEntireWidgetYouWantToWrap(child: ...)
)