断言失败：/C:/Flutter/sdk/flutter/packages/flutter/lib/src/widgets/will_pop_scope.dart:135:12 _route == M
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【中文标题】断言失败：/C:/Flutter/sdk/flutter/packages/flutter/lib/src/widgets/will_pop_scope.dart:135:12 _route == ModalRoute.of(context) is not true【英文标题】：Assertion failed: /C:/Flutter/sdk/flutter/packages/flutter/lib/src/widgets/will_pop_scope.dart:135:12 _route == ModalRoute.of(context) is not true 【发布时间】：2021-09-24 07:37:39 【问题描述】：返回上一个屏幕时出错.. 我也得到了
在小部件树中检测到重复的 GlobalKey。
屏幕 A -> 屏幕 B ->屏幕 c 工作正常
但是当从屏幕 C 回来时 ->屏幕 A 我遇到了这样的问题
orden_management
class SideBarOrderManagement extends StatelessWidget
@override
Widget build(BuildContext context)
return ListTile(
tileColor: Colors.transparent,
onTap: ()
Get.toNamed("/orders");
,
// icon
title: Text("ordermanagement".tr,
style: Theme.of(context).textTheme.subtitle1),
leading: Icon(Icons.local_offer,color: Colors.grey,),
);
OrdersMainController 代码：
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter_form_builder/flutter_form_builder.dart';
import 'package:get/get.dart';
import 'package:novadan_admin/global/models/endpoint/responsedata/nv_orders_response_data.dart';
import 'package:novadan_admin/modules/orders/orders_main/services/orders_main_service.dart';
class OrdersMainController extends GetxController
final formKey = GlobalKey<FormBuilderState>().obs;
// Rx<GlobalKey<FormBuilderState>> formKey = GlobalKey<FormBuilderState>().obs;
final mainFuture = Future.wait([]).obs;
final ordersData = NvOrdersResponseData().obs;
final ordersFuture = Future.value(NvOrdersResponseData()).obs;
var page = 1.obs;
var statusMessage = "".obs;
@override
void onInit()
super.onInit();
getOrders();
mainFuture.value = Future.wait([ordersFuture.value]);
getOrders()
ordersFuture.value = orders(page: page.value);
void getPage(int newPage)
page.value = newPage;
getOrders();
update();
void getNextPage()
if ((ordersData.value.total! / ordersData.value.perPage!).round() !=
page.value)
page.value += 1;
getOrders();
update();
void getPreviousPage()
if (page.value != 1)
page.value -= 1;
getOrders();
update();
void getFirstPage()
if (page.value != 1)
page.value = 1;
getOrders();
update();
void getLastPage()
if (page.value !=
(ordersData.value.total! / ordersData.value.perPage!).round())
page.value =
(ordersData.value.total! / ordersData.value.perPage!).round();
getOrders();
update();
头代码
import 'package:flutter/material.dart';
import 'package:flutter_form_builder/flutter_form_builder.dart';
import 'package:get/get.dart';
import 'package:novadan_admin/modules/orders/orders_main/controllers/orders_main_controller.dart';
import 'package:novadan_admin/modules/orders/orders_main/widgets/datatable/widgets/head/widgets/fields/dropdowns/buyercity_dropdown.dart';
import 'package:novadan_admin/modules/orders/orders_main/widgets/datatable/widgets/head/widgets/fields/dropdowns/cargo_dropdown.dart';
import 'package:novadan_admin/modules/orders/orders_main/widgets/datatable/widgets/head/widgets/fields/dropdowns/managers_dropdown.dart';
import 'package:novadan_admin/modules/orders/orders_main/widgets/datatable/widgets/head/widgets/fields/dropdowns/orderstatus_dropdown.dart';
import 'package:novadan_admin/modules/orders/orders_main/widgets/datatable/widgets/head/widgets/fields/dropdowns/paymentstatus_dropdown.dart';
import 'package:novadan_admin/modules/orders/orders_main/widgets/datatable/widgets/head/widgets/fields/dropdowns/sellercity_dropdown.dart';
import 'package:novadan_admin/modules/orders/orders_main/widgets/datatable/widgets/head/widgets/fields/dropdowns/sort_dropdown.dart';
import 'package:novadan_admin/modules/orders/orders_main/widgets/datatable/widgets/head/widgets/fields/dropdowns/sort_dropdown.dart';
import 'package:novadan_admin/modules/orders/orders_main/widgets/datatable/widgets/head/widgets/fields/dropdowns/users_dropdown.dart';
import 'package:novadan_admin/modules/orders/orders_main/widgets/datatable/widgets/head/widgets/fields/textfields/searchbar.dart';
class OrdersMainDataTableHead extends StatelessWidget
final OrdersMainController ordersMainController = Get.find();
@override
Widget build(BuildContext context)
final width = MediaQuery.of(context).size.width;
return FormBuilder(
key: ordersMainController.formKey.value,
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
"ordersmaintitle".tr,
style: Theme.of(context).textTheme.subtitle1,
),
SizedBox(height: 15),
ElevatedButton(
onPressed: () ,
child: Text("clearfilter".tr, style: Theme.of(context).textTheme.button),
),
SizedBox(height: 15),
OrdersMainDataTableHeaderSearchBar(),
SizedBox(
height: 30,
),
GridView.count(
childAspectRatio: .9 / .2,
mainAxisSpacing: 20,
shrinkWrap: true,
physics: NeverScrollableScrollPhysics(),
crossAxisCount: width < 714
? 1
: width < 1001
? 2
: width < 1019
? 1
: width < 1358
? 2
: width < 1317
? 2
: width < 1451
? 3
: width < 1694
? 3
: width < 1921
? 4
: 1,
children: <Widget>[
OrdersMainDataTableHeaderSortDropDown(),
OrdersMainDataTableHeaderOrderStatusDropDown(),
OrdersMainDataTableHeaderPaymentStatusDropDown(),
OrdersMainDataTableHeaderSellerCityDropDown(),
OrdersMainDataTableHeaderBuyerCityDropDown(),
OrdersMainDataTableHeaderCargoDropDown(),
OrdersMainDataTableHeaderManagersDropDown(),
OrdersMainDataTableHeaderUserDropDown(),
]),
],
));
错误屏幕
控制台屏幕
will_pop_scope.dart:135:12 代码
// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'framework.dart';
import 'navigator.dart';
import 'routes.dart';
/// Registers a callback to veto attempts by the user to dismiss the enclosing
/// [ModalRoute].
///
/// @tool snippet --template=stateful_widget
///
/// Whenever the back button is pressed, you will get a callback at [onWillPop],
/// which returns a [Future]. If the [Future] returns true, the screen is
/// popped.
///
/// ```dart
/// bool shouldPop = true;
/// @override
/// Widget build(BuildContext context)
/// return WillPopScope (
/// onWillPop: () async
/// return shouldPop;
/// ,
/// child: const Text('WillPopScope sample'),
/// );
///
/// ```
/// @end-tool
///
/// @tool dartpad --template=stateful_widget_material
/// ```dart
/// bool shouldPop = true;
/// @override
/// Widget build(BuildContext context)
/// return WillPopScope(
/// onWillPop: () async
/// return shouldPop;
/// ,
/// child: Scaffold(
/// appBar: AppBar(
/// title: const Text('Flutter WillPopScope demo'),
/// ),
/// body: Center(
/// child: Column(
/// mainAxisAlignment: MainAxisAlignment.center,
/// children: <Widget>[
/// OutlinedButton(
/// child: const Text('Push'),
/// onPressed: ()
/// Navigator.of(context).push<void>(
/// MaterialPageRoute<void>(
/// builder: (BuildContext context)
/// return const MyStatefulWidget();
/// ,
/// ),
/// );
/// ,
/// ),
/// OutlinedButton(
/// child: Text('shouldPop: $shouldPop'),
/// onPressed: ()
/// setState(
/// ()
/// shouldPop = !shouldPop;
/// ,
/// );
/// ,
/// ),
/// const Text('Push to a new screen, then tap on shouldPop '
/// 'button to toggle its value. Press the back '
/// 'button in the appBar to check its behaviour '
/// 'for different values of shouldPop'),
/// ],
/// ),
/// ),
/// ),
/// );
///
/// ```
///
/// @end-tool
///
/// See also:
///
/// * [ModalRoute.addScopedWillPopCallback] and [ModalRoute.removeScopedWillPopCallback],
/// which this widget uses to register and unregister [onWillPop].
/// * [Form], which provides an `onWillPop` callback that enables the form
/// to veto a `pop` initiated by the app's back button.
///
class WillPopScope extends StatefulWidget
/// Creates a widget that registers a callback to veto attempts by the user to
/// dismiss the enclosing [ModalRoute].
///
/// The [child] argument must not be null.
const WillPopScope(
Key? key,
required this.child,
required this.onWillPop,
) : assert(child != null),
super(key: key);
/// The widget below this widget in the tree.
///
/// @macro flutter.widgets.ProxyWidget.child
final Widget child;
/// Called to veto attempts by the user to dismiss the enclosing [ModalRoute].
///
/// If the callback returns a Future that resolves to false, the enclosing
/// route will not be popped.
final WillPopCallback? onWillPop;
@override
State<WillPopScope> createState() => _WillPopScopeState();
class _WillPopScopeState extends State<WillPopScope>
ModalRoute<dynamic>? _route;
@override
void didChangeDependencies()
super.didChangeDependencies();
if (widget.onWillPop != null)
_route?.removeScopedWillPopCallback(widget.onWillPop!);
_route = ModalRoute.of(context);
if (widget.onWillPop != null)
_route?.addScopedWillPopCallback(widget.onWillPop!);
@override
void didUpdateWidget(WillPopScope oldWidget)
super.didUpdateWidget(oldWidget);
assert(**_route** == ModalRoute.of(context));
if (widget.onWillPop != oldWidget.onWillPop && _route != null)
if (oldWidget.onWillPop != null)
_route!.removeScopedWillPopCallback(oldWidget.onWillPop!);
if (widget.onWillPop != null)
_route!.addScopedWillPopCallback(widget.onWillPop!);
@override
void dispose()
if (widget.onWillPop != null)
_route?.removeScopedWillPopCallback(widget.onWillPop!);
super.dispose();
@override
Widget build(BuildContext context) => widget.child;
【问题讨论】：
【参考方案1】：看看这是否可行，我只是遇到了这个问题，并通过弄乱找到了解决方案：Flutter Routing Issue and Duplicate GlobalKey
【讨论】：
您的答案可以通过额外的支持信息得到改进。请edit 添加更多详细信息，例如引用或文档，以便其他人可以确认您的答案是正确的。你可以找到更多关于如何写好答案的信息in the help center。以上是关于断言失败：/C:/Flutter/sdk/flutter/packages/flutter/lib/src/widgets/will_pop_scope.dart:135:12 _route == M的主要内容，如果未能解决你的问题，请参考以下文章