所以我面臨這個問題，我的警報對話框沒有顯示。我已經嘗試了所有可能的解決方案并在這里和那里搜索，但沒有任何效果。當我從彈出選單中單擊編輯按鈕時，什么都沒有顯示，一切都保持不變。
呼叫警報對話框
trailing: PopupMenuButton(
icon: Icon(Icons.more_vert),
itemBuilder: (context)=>[
PopupMenuItem(
value:1,
onTap: (){
//debugPrint('popup');
Navigator.pop(context);
_showMyDialog();
},
child: ListTile(
leading: Icon(Icons.edit),
title: Text('Edit'),
)),
PopupMenuItem(
value:1,
// onTap: (){
// Navigator.pop(context);
// showDialogBox();
// },
child: ListTile(
leading: Icon(Icons.delete),
title: Text('Delete'),
)),
]),
警報對話框代碼
Future<void> showDialogBox(String title)async{
editController.text=title;
debugPrint('dialog');
return showDialog<void>(
context: context,
barrierDismissible: false,
builder: (BuildContext context){
debugPrint('alert');
return AlertDialog(
title: Text('Update'),
content: Container(
child: TextFormField(
controller: editController,
),
),
actions: [
TextButton(onPressed: (){
Navigator.pop(context);
}, child: Text('Update')),
TextButton(onPressed: (){
Navigator.pop(context);
}, child: Text('Cancel')),
],
);
}
); } 完整的類代碼
import 'package:firebase_auth/firebase_auth.dart';
import 'package:firebase_database/ui/firebase_animated_list.dart';
import 'package:firebase_tutorial/utils/routes/routes_names.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:firebase_database/firebase_database.dart';
import '../../utils/utils.dart';
class PostScreen extends StatefulWidget {
const PostScreen({Key? key}) : super(key: key);
@override
State<PostScreen> createState() => _PostScreenState();
}
class _PostScreenState extends State<PostScreen> {
final ref=FirebaseDatabase.instance.ref('Post');
FirebaseAuth _auth=FirebaseAuth.instance;
final searchController=TextEditingController();
final editController=TextEditingController();
@override
Widget build(BuildContext context) {
return WillPopScope(
onWillPop: ()async{
SystemNavigator.pop();
return true;
},
child: Scaffold(
appBar: AppBar(
automaticallyImplyLeading: false,
title: Text('Post Screen'),
actions: [
GestureDetector(
onTap: (){
_auth.signOut().then((value){
Navigator.pushNamed(context, RoutesNames.loginScreen);
}).onError((error, stackTrace){
Utils().toastMessage(error.toString());
});
},
child: Icon(Icons.logout_outlined)),
SizedBox(width: 10,),
],
),
floatingActionButton: FloatingActionButton(
onPressed:(){
Navigator.pushNamed(context, RoutesNames.newPost);
},
child: Icon(Icons.add),),
body: Column(
children: [
// Expanded(
// child:FirebaseAnimatedList(
// query: ref,
// itemBuilder: (context,snapshot,animation,index){
// return ListTile(
// title: Text(snapshot.child('post').value.toString()),
// );
// }
// ),
// ),
Padding(
padding: const EdgeInsets.all(10.0),
child: TextFormField(
onChanged: (String value){
setState(() {
});
},
controller: searchController,
decoration: InputDecoration(
border: OutlineInputBorder(),
hintText: "Search",
),
),
),
Expanded(child: StreamBuilder(
stream: ref.onValue,
builder: (context,AsyncSnapshot<DatabaseEvent> snapshot){
if(!snapshot.hasData){
return CircularProgressIndicator();
}
else{
return ListView.builder(
itemCount: snapshot.data!.snapshot.children.length,
itemBuilder: (context,index){
Map<dynamic,dynamic> map=snapshot.data!.snapshot.value as dynamic;
List<dynamic> list=[];
list.clear();
list=map.values.toList();
final title=list[index]['post'].toString();
if(searchController.text.isEmpty){
return ListTile(
title: Text(list[index]['post']),
subtitle: Text(list[index]['id'].toString()),
trailing: PopupMenuButton(
icon: Icon(Icons.more_vert),
itemBuilder: (context)=>[
PopupMenuItem(
value:1,
onTap: (){
//debugPrint('popup');
Navigator.pop(context);
_showMyDialog();
},
child: ListTile(
leading: Icon(Icons.edit),
title: Text('Edit'),
)),
PopupMenuItem(
value:1,
// onTap: (){
// Navigator.pop(context);
// showDialogBox();
// },
child: ListTile(
leading: Icon(Icons.delete),
title: Text('Delete'),
)),
]),
);
}
else if(title.toLowerCase().contains(searchController.text.toLowerCase())){
return ListTile(
title: Text(list[index]['post']),
subtitle: Text(list[index]['id'].toString()),
);
}
else{
return Container();
}
});
}
}))
],
),
),
);
}
Future<void> showDialogBox(String title)async{
editController.text=title;
debugPrint('dialog');
return showDialog<void>(
context: context,
barrierDismissible: false,
builder: (BuildContext context){
debugPrint('alert');
return AlertDialog(
title: Text('Update'),
content: Container(
child: TextFormField(
controller: editController,
),
),
actions: [
TextButton(onPressed: (){
Navigator.pop(context);
}, child: Text('Update')),
TextButton(onPressed: (){
Navigator.pop(context);
}, child: Text('Cancel')),
],
);
}
);
}
}
uj5u.com熱心網友回復：
嘗試在呼叫 showDialog 之前添加延遲，如下所示：
await Future.delayed(const Duration(milliseconds: 500));
這可能是因為當您選擇一個選單項時，會呼叫 pop() 方法來關閉彈出選單；因此，如果您立即打開一個對話框，該對話框將自動彈出。希望這可以解決您的問題
轉載請註明出處，本文鏈接：https://www.uj5u.com/ruanti/523520.html