[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")
)
試圖像這樣向我的Flutter應用程序添加timePicker。 輕擊文本會導致錯誤。
E / flutter(23737):[錯誤:flutter / shell / common / shell.cc(181)] Dart錯誤:未處理的異常:E / flutter(23737):NoSuchMethodError:吸氣劑'modalBarrierDismissLabel'被調用為null。 E / flutter(23737):接收方:空E / flutter(23737):嘗試調用: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) ):
這是一個問題,因為傳遞到showTimePicker()
的上下文在小部件樹中的MaterialApp
上方。
要修復它,您需要另一個上下文,並且可以在MaterialApp
下面使用一個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"),
)
],
),
),
),
);
}
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.