[英]Flutter calling showTimePicker function results in error: The getter 'modalBarrierDismissLabel' was called on null
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(title: Text("Hello Flutter"),),
body: Column(children: [
GestureDetector(
onTap: () {
showTimePicker(
context: context,
initialTime: const TimeOfDay(hour: 7, minute: 0),
);
},
child: Text("22:30")
)
试图像这样向我的Flutter应用程序添加timePicker。 轻击文本会导致错误。
E / flutter(23737):[错误:flutter / shell / common / shell.cc(181)] Dart错误:未处理的异常:E / flutter(23737):NoSuchMethodError:吸气剂'modalBarrierDismissLabel'被调用为null。 E / flutter(23737):接收方:空E / flutter(23737):尝试调用:modalBarrierDismissLabel E / flutter(23737):#0
Object.noSuchMethod(dart:core / runtime / libobject_patch.dart:48:5)E / flutter(23737):#1 showDialog(包:flutter / src / material / dialog.dart:615:53)E / flutter(23737) ):
这是一个问题,因为传递到showTimePicker()
的上下文在小部件树中的MaterialApp
上方。
要修复它,您需要另一个上下文,并且可以在MaterialApp
下面使用一个Builder
。
import 'package:flutter/material.dart';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text("Hello Flutter"),
),
body: Builder(
builder: (context) => Column(
children: [
GestureDetector(
onTap: () {
showTimePicker(
context: context,
initialTime: const TimeOfDay(hour: 7, minute: 0),
);
},
child: Text("22:30"),
)
],
),
),
),
);
}
}
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