Flutter：_route == ModalRoute.of(context)'：在对话框中不正确答案

【问题标题】：Flutter: _route == ModalRoute.of(context)': is not true on dialogFlutter：_route == ModalRoute.of(context)'：在对话框中不正确
【发布时间】：2021-07-08 18:53:49
【问题描述】：

final _sectionFormKey = GlobalKey<FormState>();

...
TextButton.icon(
              onPressed: _addSection,
              icon: Icon(Icons.info_outline_rounded),
              label: Text("open"),
            ),
...

_addSection() {
    return showDialog<void>(
      context: context,
      builder: (context) => PlatformAlertDialog(
        title: Text(translate("other_details.extra_sections")),
        content: Form(
          key: _sectionFormKey,
          child: Text(translate("other_details.extra_sections_info")),
        ),
        actions: <Widget>[
          TextButton(
            child: new PlatformText((translate('ok'))),
            onPressed: () {
              Navigator.of(context).pop();
            },
          ),
        ],
      ),
    );
  }

如果我在按钮上单击太快（一个显示对话框，然后再次单击背景关闭它）我会收到以下错误：

'package:flutter/src/widgets/will_pop_scope.dart'：断言失败：第 135 行 pos 12: '_route == ModalRoute.of(context)': is not true.

'package:flutter/src/widgets/framework.dart'：断言失败：行 4954 pos 14: '_dependents.isEmpty': 不正确。

要么断言表明框架本身存在错误，要么我们应在此错误消息中提供更多信息帮助您确定并解决根本原因。

【问题讨论】：

如果你使用Navigator.pop(context);会发生什么？

标签： flutter flutter-layout

【解决方案1】：

Please change your code to:
final _sectionFormKey = GlobalKey<FormState>();

...
TextButton.icon(
              onPressed: _addSection,
              icon: Icon(Icons.info_outline_rounded),
              label: Text("open"),
            ),
...

_addSection() {
    return showDialog<void>(
      context: context,
      builder: (context) => PlatformAlertDialog(
        title: Text(translate("other_details.extra_sections")),
        content: Form(
          key: _sectionFormKey,
          child: Text(translate("other_details.extra_sections_info")),
        ),
        actions: <Widget>[
          TextButton(
            child: new PlatformText((translate('ok'))),
            onPressed: () {
              Navigator.pop(context);
            },
          ),
        ],
      ),
    );
  }

【讨论】：

onPressed: Navigator.push(context, MaterialPageRoute(builder: (BuildContext context) => _addSection()));