我正在構建一個帶有退出按鈕和洗掉鍛煉按鈕的鍛煉應用程式。我制作了一個檔案而不是 2 并傳遞了變數。我這樣做是為了不必制作 2 個檔案。
問題出function;在 dialog.instance.dart 中的 onPressed 回呼中
如果我不傳遞變數它作業正常。但我不想制作 2 個單獨的檔案。
我試過這個，但它沒有計劃好：
dialog_instance.dart
Future<void> DialogInstance(BuildContext context, void Function()? function,
String name, String description) {
return showDialog(
context: context,
builder: (context) {
return AlertDialog(
backgroundColor: Colors.blueGrey,
title: Text(
name,
style: const TextStyle(color: Colors.white),
),
actions: [
Row(
children: [
const SizedBox(width: 16.0),
Text(
'Are you sure $description',
style: const TextStyle(color: Colors.white),
)
],
),
const SizedBox(height: 20),
Row(
children: [
Expanded(
child: OutlinedButton(
onPressed: () {
function;
},
style:
OutlinedButton.styleFrom(backgroundColor: Colors.red),
child: const Text('Yes',
style: TextStyle(color: Colors.white)),
),
),
],
),
Row(
children: [
Expanded(
child: OutlinedButton(
onPressed: () {
Navigator.pop(context);
},
child: const Text('Cancel',
style: TextStyle(color: Colors.white)),
),
),
],
),
],
);
});
}
鍛煉頁面.dart
class WorkoutPage extends StatefulWidget {
const WorkoutPage({Key? key}) : super(key: key);
@override
State<WorkoutPage> createState() => _WorkoutPageState();
}
User user = FirebaseAuth.instance.currentUser!;
String signOutText = 'Sign Out';
const signOutDescription = 'you want to sign out?';
class _WorkoutPageState extends State<WorkoutPage> {
@override
Widget build(BuildContext context) {
void signOutFunction() {
AuthService.signOutMethod();
Navigator.of(context)
.pushNamedAndRemoveUntil('/login', (Route<dynamic> route) => false);
}
return Scaffold(
backgroundColor: backgroundColor,
appBar: AppBar(
automaticallyImplyLeading: false,
title: Text(user.email!, style: const TextStyle(fontSize: 14)),
backgroundColor: backgroundColor,
actions: <Widget>[
Padding(
padding: const EdgeInsets.all(8.0),
child: GradientElevatedButton(
onPressed: () {
DialogInstance(context, signOutFunction, signOutText,
signOutDescription);
},
child: const Text('Sign out')),
)
],
),
floatingActionButton: FloatingActionButton(
backgroundColor: Colors.cyan,
onPressed: () {
Navigator.push(context,
MaterialPageRoute(builder: (context) => const ExercisePage()));
},
child: const Icon(
Icons.add,
color: Colors.black,
),
),
);
}
}
心血管卡.dart
class CardiovascularCard extends StatefulWidget {
AsyncSnapshot<QuerySnapshot> snapshot;
int index;
CardiovascularCard(this.snapshot, this.index, {Key? key}) : super(key: key);
@override
State<CardiovascularCard> createState() => _CardiovascularCardState();
}
String deleteExerciseText = 'Delete exercise';
final uid = FirebaseAuth.instance.currentUser?.uid;
TextEditingController _calorieController = TextEditingController();
TextEditingController _timeController = TextEditingController();
String deleteExerciseDescription = 'you want to delete this exercise?';
class _CardiovascularCardState extends State<CardiovascularCard> {
@override
Widget build(BuildContext context) {
String deleteExerciseText = 'Delete exercise';
final uid = FirebaseAuth.instance.currentUser?.uid;
final data = widget.snapshot.data;
final exerciseId = data!.docs[widget.index].reference.id;
void deleteExerciseFunction() {
FirebaseFirestore.instance
.runTransaction((Transaction myTransaction) async {
myTransaction.delete(data.docs[widget.index].reference);
});
}
return Padding(
padding: const EdgeInsets.all(16.0),
child: Column(children: [
Card(
elevation: 8,
color: const Color.fromARGB(255, 81, 108, 122),
child: Column(
children: [
Row(
mainAxisAlignment: MainAxisAlignment.start,
children: [
Padding(
padding: const EdgeInsets.all(8.0),
child: Text(
data.docs[widget.index]['exerciseName'],
style: const TextStyle(
fontSize: 20.0, fontWeight: FontWeight.bold),
),
),
const Divider(thickness: 1.0),
],
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: const [
Text(
'Calories',
style: TextStyle(color: Colors.white),
),
Text(
'Time',
style: TextStyle(color: Colors.white),
),
],
),
Slidable(
endActionPane: ActionPane(
motion: const ScrollMotion(),
children: [
SlidableAction(
onPressed: (context) {
DialogInstance(context, deleteExerciseFunction,
deleteExerciseText, deleteExerciseDescription);
},
label: 'Delete',
backgroundColor: Colors.red,
icon: Icons.delete,
)
],
),
child: ListTile(
title: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
SizedBox(
width: MediaQuery.of(context).size.width * 0.145,
child: TextField(
style: const TextStyle(fontWeight: FontWeight.bold),
cursorColor: Colors.white,
onSubmitted: (value) async {
FirebaseFirestore.instance.runTransaction(
(Transaction myTransaction) async {
FirebaseFirestore.instance
.collection('users')
.doc(uid)
.collection('workout')
.doc(exerciseId)
.update({'caloriesBurnt': value});
});
},
textAlign: TextAlign.center,
keyboardType: TextInputType.number,
controller: _calorieController,
decoration: InputDecoration(
focusedBorder: const UnderlineInputBorder(
borderSide: BorderSide(color: Colors.white),
),
hintText: data.docs[widget.index]['caloriesBurnt']
.toString()),
),
),
SizedBox(
width: MediaQuery.of(context).size.width * 0.145,
child: TextField(
style: const TextStyle(fontWeight: FontWeight.bold),
cursorColor: Colors.white,
onSubmitted: (value) async {
FirebaseFirestore.instance.runTransaction(
(Transaction myTransaction) async {
FirebaseFirestore.instance
.collection('users')
.doc(uid)
.collection('workout')
.doc(exerciseId)
.update({'time': value});
});
},
textAlign: TextAlign.center,
keyboardType: TextInputType.number,
controller: _timeController,
decoration: InputDecoration(
focusedBorder: const UnderlineInputBorder(
borderSide: BorderSide(color: Colors.white),
),
hintText:
data.docs[widget.index]['time'].toString()),
),
),
],
),
),
),
],
),
),
]),
);
}
}
uj5u.com熱心網友回復：
如果我理解正確 -function不呼叫函式命名。
您必須使用function()or呼叫該函式tear-off
Row(
children: [
Expanded(
child: OutlinedButton(
onPressed: () {
function();
},
或者
Row(
children: [
Expanded(
child: OutlinedButton(
onPressed:function,
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