在小部件树中检测到重复的GlobalKey，每个子节点必须精确布局一次。
enter code herei有一个抽屉类，它有包含服务列表的多页，在每个页面中都添加了带有 GlobalKey<FormState> _formKey = GlobalKey<FormState>();的服务页。
我的页面流就像抽屉->实用程序列表页面->添加实用程序
，但我收到了错误：
The following assertion was thrown building Form-[LabeledGlobalKey<FormState>#98e90](state: FormState#bd67c): 'package:flutter/src/widgets/will_pop_scope.dart': Failed assertion: line 135 pos 12: '_route == ModalRoute.of(context)': is not true.
======== Exception caught by rendering library ===================================================== Each child must be laid out exactly once.
======== Exception caught by widgets library ======================================================= The following assertion was thrown building Overlay-[LabeledGlobalKey<OverlayState>#94fb8](state: OverlayState#45c6b(entries: [OverlayEntry#3a155(opaque: true; maintainState: false), OverlayEntry#62084(opaque: false; maintainState: true), OverlayEntry#c051d(opaque: true; maintainState: false), OverlayEntry#ea85f(opaque: false; maintainState: true), OverlayEntry#6b05f(opaque: true; maintainState: false), OverlayEntry#b940f(opaque: false; maintainState: true)])): 'package:flutter/src/widgets/framework.dart': Failed assertion: line 4954 pos 14: '_dependents.isEmpty': is not true.
======== Exception caught by widgets library ======================================================= Duplicate GlobalKey detected in widget tree.
**我尝试过许多解决办法，但都没有奏效**
i根据服务命名密钥差异网
加载项：
class AddUtilityBillState extends State<AddUtilityBill>{
TextEditingController _nameController = TextEditingController();
TextEditingController _amountController = TextEditingController();
TextEditingController _descController = TextEditingController();
TextEditingController _serviceController = TextEditingController();
GlobalKey<FormState> utilityFormKey =GlobalKey<FormState>();
@override
void dispose() {
utilityFormKey.currentState?.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return Hero(
tag: widget._tag,
child: Scaffold(
floatingActionButtonLocation:
FloatingActionButtonLocation.miniEndTop,
floatingActionButton: Container(
child: FloatingActionButton(
heroTag: null,
onPressed: () {
setState(() {
if (_validate(context)) {
_submit(context);
}
});
},
backgroundColor: primaryDarkColor,
child: Icon(
Icons.done,
color: Colors.white,
),
elevation: 0,
mini: true,
)),
appBar: AppBar(
backgroundColor: primaryColor,
shadowColor: Colors.transparent,
title: widget._from.toString().headText(context: context),
iconTheme: IconThemeData(color: Colors.white),
),
body:
Form(
key: utilityFormKey,
child:
_form(),
)));
}
form() {
return Expanded(
child: ListView(
shrinkWrap: true,
children: [
'${Strings.utilityBillTypes} :'
.bigText(context: context, color: Colors.black54, isBold: true)
.px16(),
p10.heightBox,
widget._serviceModel == null
? _utilityBillType()
: widget._serviceModel.categoryType
.bigText(context: context, color: Colors.black87)
.px16(),
Visibility(
visible: _utilityBillTypeErrorVisible,
child: (context.isMobile ? p5 : p10).heightBox),
Visibility(
visible: _utilityBillTypeErrorVisible,
child: _utilityBillTypeErrorText
.normalText(
context: context,
color: Colors.red,
)
.objectTopLeft()
.px16()),
p20.heightBox,
Row(children: [
Expanded(
child: CustomTextField(
keyboardType: TextInputType.name,
controller: _nameController,
labelText: Strings.name,
hintText: Strings.enterName,
validator: (String value) {
if (value.isEmpty) {
return Strings.emptyName;
}
return null;
},
)),
p20.widthBox,
Expanded(
child: CustomTextField(
keyboardType: TextInputType.number,
controller: _amountController,
labelText: Strings.amount,
hintText: Strings.enterAmount,
validator: (String value) {
if (value.isEmpty) {
return Strings.emptyAmount;
}
return null;
},
))
]).px16(),
p20.heightBox,
CustomTextField(
keyboardType: TextInputType.text,
controller: _descController,
labelText: Strings.description,
hintText: Strings.enterDesc,
).px16(),
p20.heightBox,
Visibility(
visible: defaultTargetPlatform == TargetPlatform.android
? _billTypeClicked2
: _billTypeClicked,
child: CustomTextField(
keyboardType: TextInputType.text,
controller: _serviceController,
labelText: defaultTargetPlatform == TargetPlatform.android
? _billTypeItemSelected != null
? _billTypeItemSelected.service
: ''
: _serviceTypeModelList[_billTypeSelectedIndex].service,
hintText: defaultTargetPlatform == TargetPlatform.android
? _billTypeItemSelected != null
? '${Strings.enterData} ${_billTypeItemSelected.service}'
: ''
: '${Strings.enterData} ${_serviceTypeModelList[_billTypeSelectedIndex].service}',
validator: (String value) {
if (value.isEmpty) {
return Strings.emptyAmount;
}
return null;
},
).px16()),
Visibility(
visible: (_billTypeClicked2 || _billTypeClicked),
child: p20.heightBox),
Strings.reminderDateTime
.bigText(context: context, color: Colors.black54, isBold: true)
.px16(),
p20.heightBox,
Wrap(children: [
VxBox(
child: Icon(
Icons.date_range_outlined,
color: primaryColor,
)).roundedSM.shadowSm.color(Colors.white).p8.make(),
p15.widthBox,
InkWell(
onTap: () {
FocusScope.of(context).unfocus();
_dateCLicked = true;
defaultTargetPlatform == TargetPlatform.iOS
? _showDatePicker(context)
: _selectDate(context);
},
child: VxBox(
child: (_dateCLicked
? defaultTargetPlatform == TargetPlatform.iOS
? _chosenDateTime != null
? DateFormat(Strings.dateFormat)
.format(_chosenDateTime)
.toString()
: Strings.chooseDate
: "${_selectedDate.toLocal()}"
.split(' ')[0]
: Strings.chooseDate)
.bigText(context: context, color: Colors.grey)
.objectCenter()
.px4())
.color(Colors.grey[200])
.height(p40)
.width(MediaQuery.of(context).size.width / 1.4)
.roundedSM
.make())
]).px24(),
Visibility(
visible: _dateErrorVisible,
child: (context.isMobile ? p5 : p10).heightBox),
Visibility(
visible: _dateErrorVisible,
child: _dateErrorText
.normalText(
context: context,
color: Colors.red,
)
.objectCenter()
.px16()),
p20.heightBox,
Wrap(children: [
VxBox(
child: Icon(
Icons.access_time_outlined,
color: primaryColor,
)).roundedSM.shadowSm.color(Colors.white).p8.make(),
p15.widthBox,
InkWell(
onTap: () {
FocusScope.of(context).unfocus();
_timeCLicked = true;
defaultTargetPlatform == TargetPlatform.iOS
? _showTimePicker(context)
: _selectTime(context);
},
child: VxBox(
child:
(defaultTargetPlatform == TargetPlatform.iOS
? _timeIOS != null
? _timeIOS
: Strings.chooseTime
: _time != null
? _time
: Strings.chooseTime)
.bigText(context: context, color: Colors.grey)
.objectCenter()
.px4())
.color(Colors.grey[200])
.height(p40)
.width(MediaQuery.of(context).size.width / 1.4)
.roundedSM
.make())
]).px24(),
Visibility(
visible: _timeErrorVisible,
child: (context.isMobile ? p5 : p10).heightBox),
Visibility(
visible: _timeErrorVisible,
child: _timeErrorText
.normalText(
context: context,
color: Colors.red,
)
.objectCenter()
.px16()),
p40.heightBox,
Button(
onTap: () {
setState(() {
if (_validate(context)) {
_submit(context);
}
});
},
title: Strings.submit),
Visibility(visible: _isLoading, child: p10.heightBox),
Visibility(
visible: _isLoading,
child: CircularProgressIndicator(
backgroundColor: primaryColor,
).objectCenter(),
),
p30.heightBox
],
));
}
}回答 1
Stack Overflow用户
发布于 2022-10-28 12:00:37
虽然这个错误听起来像是命名GlobalKeys的一个问题，但它实际上是一个重复的脚手架。当你使用push导航到第二页时，而不是弹出第二页时，就会出现这种情况，然后尝试将其推回原版。这是在试图创建一个重复的Scaffold。
此外，当在Modal中创建Scaffold时，可能会发生这种情况。在这种特殊的情况下，很难分辨到底发生了什么，但这是两个共同的原因。
https://stackoverflow.com/questions/66794040
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