我正在尝试使用选择轮小部件在一个页面上选择高度（int）和重量（double）值，然后将其发送到另一页面以显示并最终在计算中使用这些值。
我尝试通过构造函数解析变量，但无论如何它们都停留在 0 或 0.0。我不确定问题是否来自选择轮没有保存我的选择，或者解析在某个时刻将值设置为 0
以下是涉及的不同页面，它们被分隔在多个.dart文件中：
main.dart：
import 'package:appli_teeshirt/pages/profile.dart';
import 'package:appli_teeshirt/pages/bt_connect.dart';
import 'package:appli_teeshirt/pages/historique.dart';
import 'package:appli_teeshirt/pages/page_accueil.dart';
import 'package:flutter/material.dart';
final GlobalKey<_MyappState> myAppKey = GlobalKey<_MyappState>();
void main() {
runApp(Myapp(key: myAppKey));
}
class Myapp extends StatefulWidget {
const Myapp({Key? key}) : super(key: key);
@override
State<Myapp> createState() => _MyappState();
}
class _MyappState extends State<Myapp> {
int _currentIndex = 0;
double _poids = 0.0;
int _taille = 0;
void setCurrentIndex(int index) {
setState(() {
_currentIndex = index;
});
}
void setPoidsAndTaille(double poids, int taille) {
setState(() {
_poids = poids;
_taille = taille;
});
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: [
const Text("Accueil"),
const Text("Connection Bluetooth"),
const Text("Historique des courses"),
const Text("Profile Utilisateur"),
][_currentIndex],
),
body: IndexedStack(
index: _currentIndex,
children: [
const PageAccueil(),
const BTconnect(),
historique(poids: _poids, taille: _taille),
UserProfile(
onSubmit: (index) {
setCurrentIndex(index);
},
onPoidsTailleChange: (poids, taille) {
setPoidsAndTaille(poids, taille);
},
),
],
),
bottomNavigationBar: BottomNavigationBar(
currentIndex: _currentIndex,
onTap: setCurrentIndex,
type: BottomNavigationBarType.fixed,
selectedItemColor: Colors.deepPurple,
unselectedItemColor: Colors.grey,
iconSize: 32,
elevation: 10,
items: const [
BottomNavigationBarItem(
icon: Icon(Icons.home),
label: 'Accueil'
),
BottomNavigationBarItem(
icon: Icon(Icons.bluetooth),
label: 'Connection BT'
),
BottomNavigationBarItem(
icon: Icon(Icons.history),
label: 'Historique'
),
BottomNavigationBarItem(
icon: Icon(Icons.account_circle),
label: 'profile'
)
],
),
),
);
}
}
profile.dart（我在其中选择值）：
import 'package:flutter/material.dart';
import 'package:selector_wheel/selector_wheel.dart';
import 'package:appli_teeshirt/main.dart';
class UserProfile extends StatefulWidget {
final void Function(int) onSubmit;
final void Function(double, int) onPoidsTailleChange;
const UserProfile({
Key? key,
required this.onSubmit,
required this.onPoidsTailleChange,
}) : super(key: key);
@override
State<UserProfile> createState() => _UserProfileState();
}
class _UserProfileState extends State<UserProfile> {
final _formKey = GlobalKey<FormState>();
final profilNameController = TextEditingController();
final tailleController = TextEditingController();
@override
void dispose() {
super.dispose();
profilNameController.dispose();
tailleController.dispose();
}
@override
Widget build(BuildContext context) {
double selectedPoids = 0.0;
int selectedTaille = 0;
return Container(
margin: const EdgeInsets.all(20),
child: Form(
key: _formKey,
child: Column(
children: [
Container(
margin: const EdgeInsets.only(bottom: 10),
child: TextFormField(
decoration: const InputDecoration(
labelText: "nom du profil",
hintText: "entre ton nom",
border: OutlineInputBorder(),
),
validator: (value){
if (value == null || value.isEmpty){
return "Tu dois completer ce texte";
}
return null;
},
),
),
Row(
mainAxisSize: MainAxisSize.min,
children: [
Column(
children: [
const Text('Poids'),
SizedBox(
width: 100,
height: 200,
child: SelectorWheel(
childCount: 241,
diameterRatio: 3.5,
convertIndexToValue: (int index) {
// This is just to illustrate, that the index can be converted
// to any value. In this case, we are converting the index to
// a quarter of a pound.
final quarter = (index +60) / 2;
return SelectorWheelValue(
// The label is what is displayed on the selector wheel
label: '${quarter.toString()} kg',
value: quarter,
index: index,
);
},
onValueChanged: (SelectorWheelValue<double> value) {
// print the value that was selected
setState(() {
selectedPoids = value.value;
});
},
),
),
],
),
Column(
children: [
const Text('Taille'),
SizedBox(
width: 100,
height: 200,
child: SelectorWheel(
childCount: 121,
diameterRatio: 3.5,
convertIndexToValue: (int index) {
final height = index + 130;
// final quarter = (index +130) /1;
return SelectorWheelValue(
// The label is what is displayed on the selector wheel
label: '${height.toString()} cm',
value: height,
index: index,
);
},
onValueChanged: (SelectorWheelValue<int> value) {
// print the value that was selected
setState(() {
selectedTaille = value.value;
});
},
),
),
],
),
],
),
SizedBox(
width: double.infinity,
height: 50,
child: ElevatedButton(
onPressed: () {
if (_formKey.currentState!.validate()) {
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(content: Text("envoi en cours...")),
);
FocusScope.of(context).requestFocus(FocusNode());
// Get the selected "Poids" and "Taille" values
double poids = selectedPoids;
int taille = selectedTaille;
// Call the onSubmit callback with the desired index
widget.onSubmit(3);
}
},
child: const Text("Envoyer"),
),
),
],
)
),
);
}
}
historique.dart（我想在其中显示值，特别是我想在DetailsScreen中显示它们
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
class historique extends StatelessWidget {
final double poids;
final int taille;
final List<Map<String, dynamic>> courses = [
{
"name": "Course 1",
"date": "20/03/2024",
//"logo": "course1",
"distance": 12967,
"temps": 7384
},
{
"name": "Course 2",
"date": "06/03/2024",
// "logo": "course2",
"distance": 17413,
"temps": 13854
},
{
"name": "Course 3",
"date": "27/02/2024",
// "logo": "course3",
"distance": 4967,
"temps": 3891
},
];
historique({required this.poids, required this.taille, Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
// Your build method remains the same
return Scaffold(
body: Column(
children: [
Expanded(
child:
ListView.builder(
itemCount: courses.length,
itemBuilder: (context, index) {
final course = courses[index];
final logo = course['logo'];
final name = course['name'];
final date = course['date'];
return InkWell(
onTap: () => Navigator.of(context).push(
MaterialPageRoute(
builder: (context) => DetailsScreen(
poids: poids,
taille: taille,
),
settings: RouteSettings(
arguments: course
)
),
),
child: Card(
child: ListTile(
leading: Image.asset("assets/images/course2.png"),
title: Text(name),
subtitle: Text('course du $date'),
trailing: const Icon(Icons.more_vert),
),
),
);
},
)
),
],
)
);
}
}
class DetailsScreen extends StatelessWidget {
final double poids;
final int taille;
const DetailsScreen({Key? key, required this.poids, required this.taille}) : super(key: key);
@override
Widget build(BuildContext context) {
var course = ModalRoute.of(context)!.settings.arguments as Map<String,dynamic>;
int hours = course['temps'] ~/ 3600;
int minutes = (course['temps'] ~/ 60) % 60;
int seconds = course['temps'] % 60;
return Scaffold(
appBar: AppBar(
title:
Text("${course['name']}"),
),
body: SafeArea(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
UnconstrainedBox(
child: Card(
color: Colors.lightBlueAccent,
child:
Text(
" date : ${course['date']} ",
style: const TextStyle(
fontSize: 24,
//fontFamily: 'Poppins'
),
),
),
),
const SizedBox(
height: 15,
width: 100,
),
UnconstrainedBox(
child: Card(
color: Colors.lightBlueAccent,
child:
Text(
" distance : ${course['distance']}m \n temps : $hours:$minutes'$seconds ",
style: const TextStyle(
fontSize: 24,
// fontFamily: 'Poppins'
),
) ,
),
),
const SizedBox(
height: 15,
width: 100,
),
UnconstrainedBox(
child: Card(
color: Colors.lightBlueAccent,
child:
Text(
" taille : $taille \n temps : $poids ",
style: const TextStyle(
fontSize: 24,
// fontFamily: 'Poppins'
),
) ,
),
),
],
),
),
);
}
}
问题是你的变量（
selectedPoidsselectedTaille@override
Widget build(BuildContext context) {
double selectedPoids = 0.0; // within the build method -- not the class
int selectedTaille = 0;
...
这意味着，每次您的
build因此，当您稍后调用
setState onValueChanged: (SelectorWheelValue<double> value) {
setState(() {
selectedPoids = value.value;
});
回到步骤 1。
要解决此问题，请在
Stateclass _UserProfileState extends State<UserProfile> {
final _formKey = GlobalKey<FormState>();
double selectedPoids = 0.0; // declare them within the state
int selectedTaille = 0;
final profilNameController = TextEditingController();
final tailleController = TextEditingController();