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[英]In flutter How to call method in Container on click of button?
[英]call method in container flutter
我有一個叫做 A.dart 的類,因為我是下面的 Interprogressbar
new Container(
margin: const EdgeInsets.fromLTRB(0, 10, 0, 0),
child: IntervalProgressBar(
direction: IntervalProgressDirection.horizontal,
max: count,
progress: count1,
intervalSize: 2,
size: Size(600, 10),
highlightColor: Colors.pink,
defaultColor: Colors.grey,
intervalColor: Colors.transparent,
intervalHighlightColor: Colors.transparent,
reverse: false,
radius: 0)),
一旦用戶單擊一個按鈕,我就會導航到另一個類,從 A.dart 到一個名為 B.dart 的類。 一旦使用在類 B.dart 中完成過程,我將彈出類 B.dart。 A.dart 再次對用戶可見。 所以我的問題是,一旦用戶從 B.dart 轉到 A,dart,我該如何使用更新后的值重新啟動 IntervalProgressBar。
您可以在下面復制粘貼運行完整代碼
您可以await Navigator.push
然后調用setState
void _gotoB() async {
String parameter = await Navigator.push(
context,
MaterialPageRoute(builder: (context) => RouteB()),
);
setState(() {
count1 = int.tryParse(parameter);
});
}
...
RaisedButton(
child: Text('Go back'),
onPressed: () {
Navigator.pop(context, _textEditingController.text);
},
),
工作演示
完整代碼
import 'package:flutter/material.dart';
import 'package:intervalprogressbar/intervalprogressbar.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int count = 10;
int count1 = 3;
void _gotoB() async {
String parameter = await Navigator.push(
context,
MaterialPageRoute(builder: (context) => RouteB()),
);
setState(() {
count1 = int.tryParse(parameter);
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Container(
margin: const EdgeInsets.fromLTRB(0, 10, 0, 0),
child: IntervalProgressBar(
direction: IntervalProgressDirection.horizontal,
max: count,
progress: count1,
intervalSize: 2,
size: Size(600, 10),
highlightColor: Colors.pink,
defaultColor: Colors.grey,
intervalColor: Colors.transparent,
intervalHighlightColor: Colors.transparent,
reverse: false,
radius: 0)),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _gotoB,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
class RouteB extends StatefulWidget {
@override
_RouteBState createState() => _RouteBState();
}
class _RouteBState extends State<RouteB> {
TextEditingController _textEditingController = TextEditingController();
@override
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
body: Column(
children: [
TextField(
controller: _textEditingController,
),
RaisedButton(
child: Text('Go back'),
onPressed: () {
Navigator.pop(context, _textEditingController.text);
},
),
],
)),
);
}
}
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