[英]Make only one widget float above the keyboard in Flutter
我想在鍵盤可見時在鍵盤上方顯示一個“關閉鍵盤”按鈕。
我知道 resizeToAvoidBottomInset 會影響鍵盤與應用程序的 rest 交互的方式,但它並不能完全滿足我的要求。
我有一個背景圖像和其他小部件(未在下面的示例中顯示),它們在顯示鍵盤時不應調整大小和移動。 當resizeToAvoidBottomInset
屬性設置為 false 時,這是一個正常的行為。
但是,我想添加一個應該出現在鍵盤上方的按鈕。
我怎樣才能做到這一點? 我只希望一個小部件漂浮在鍵盤上方,而不是所有應用程序。
這是一個示例代碼:
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: 0,
left: 0,
right: 0,
child: Container(
height: 50,
child: Text("Aboveeeeee"),
decoration: BoxDecoration(color: Colors.pink),
),
),
]);
}
}
您的Positioned
小部件的bottom
為 0,用適當的值替換應該可以完成這項工作。
MediaQuery.of(context).viewInsets.bottom
將為您提供系統 UI(在本例中為鍵盤)覆蓋的高度值。
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("Aboveeeeee"),
decoration: BoxDecoration(color: Colors.pink),
),
),
]);
}
}
為了實現基於鍵盤可見性的動畫填充,這里是對@10101010 的好答案的一些修改:
如果您希望在鍵盤更改可見性時bottom
更改為動畫,並且您希望在浮動子項下有額外的填充,那么:
要在鍵盤出現/消失時收聽,如下所示:
bool isKeyboardVisible = false;
@override
void initState() {
super.initState();
KeyboardVisibilityNotification().addNewListener(
onChange: (bool visible) {
isKeyboardVisible = visible;
},
);
}
您可以選擇編寫自己的本機插件,但它已經存在,您可以檢查 pub 的 git repo。
AnimatedPostioned
可見性標志:對於微調的動畫填充,如下所示:
Widget _getBody() {
double bottomPadding = 0;
if (isKeyboardVisible) {
// when keyboard is shown, our floating widget is above the keyboard and its accessories by `16`
bottomPadding = MediaQuery.of(context).viewInsets.bottom + 16;
} else {
// when keyboard is hidden, we should have default spacing
bottomPadding = 48; // MediaQuery.of(context).size.height * 0.15;
}
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()],
),
),
AnimatedPositioned(
duration: Duration(milliseconds: 500),
bottom: bottomPadding,
left: 0,
right: 0,
child: Container(
height: 50,
child: Text("Aboveeeeee"),
decoration: BoxDecoration(color: Colors.pink),
),
),
]);
}
目前這仍然是一個已知的持續問題
檢查這個包,它可以在鍵盤上方顯示一個關閉按鈕。
您可以使用 Scaffold 的 bottomSheet 參數,它可以保持一個持久的底部表。 見下面的代碼。
class InputScreen extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: const Text('Close')),
bottomSheet: Container(
padding: const EdgeInsets.symmetric(horizontal: 18, vertical: 16),
color: Colors.black,
child: const SizedBox(width: double.infinity, height: 10)),
body: Column(
children: [
const TextField(
decoration: InputDecoration(
border: OutlineInputBorder(),
hintText: 'Enter your input here',
),
),
ElevatedButton(
onPressed: () {},
child: const Text('Submit'),
),
],
),
);
}
}
您可以使用Scaffold
小部件的bottomSheet
。
例子:
return Scaffold(
appBar: AppBar(
title: const Text("New Game"),
),
bottomSheet: Container(
padding: const EdgeInsets.symmetric(horizontal: 18, vertical: 16),
color: Colors.blue,
child: const SizedBox(
width: double.infinity,
height: 20,
child: Text("Above Keyboard"),
))
...
)
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