问题描述
我已经尝试构建这个：
child: GestureDetector(
onTap: () {
return showDialog(
context: context,builder: (BuildContext context) {
return AlertDialog(
content: Text('Some text'),actions: <Widget>[
TextButton(
child: Text('Yes'),onPressed: () async {
await myFunc(context);
},),这是myFunc的代码：
Future myFunc(BuildContext context) async {
await Future.delayed(Duration(seconds: 2));
Navigator.of(context).pop();
showErrorDialog(context); //return new showDialog
}
现在它工作正常，但我想在延迟之前弹出第一个 showDialog，我尝试这样：
Future myFunc(BuildContext context) async {
Navigator.of(context).pop();
await Future.delayed(Duration(seconds: 2));
showErrorDialog(context); //return new showDialog
}
现在没有调用 showErrorDialog，我得到以下信息：
E/flutter ( 9151): [ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: Looking up a deactivated widget's ancestor is unsafe.
E/flutter ( 9151): At this point the state of the widget's element tree is no longer stable.
E/flutter ( 9151): To safely refer to a widget's ancestor in its dispose() method,save a reference to the ancestor by calling dependOnInheritedWidgetOfExactType() in the widget's didChangeDependencies() method.
E/flutter ( 9151): #0 Element._debugCheckStateIsActiveForAncestorLookup.<anonymous closure> (package:flutter/src/widgets/framework.dart:3864:9)
E/flutter ( 9151): #1 Element._debugCheckStateIsActiveForAncestorLookup (package:flutter/src/widgets/framework.dart:3878:6)
E/flutter ( 9151): #2 Element.dependOnInheritedWidgetOfExactType (package:flutter/src/widgets/framework.dart:3893:12)
E/flutter ( 9151): #3 Localizations.of (package:flutter/src/widgets/localizations.dart:472:48)
E/flutter ( 9151): #4 debugCheckHasMaterialLocalizations.<anonymous closure> (package:flutter/src/material/debug.dart:70:23)
E/flutter ( 9151): #5 debugCheckHasMaterialLocalizations (package:flutter/src/material/debug.dart:91:4)
E/flutter ( 9151): #6 showDialog (package:flutter/src/material/dialog.dart:1049:10)
...
如何在延迟之前调用 pop 而不会出错？
解决方法
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