我试图从对话框返回一个布尔值,但我不明白为什么该值没有根据需要返回。我尝试返回作为未来值,并在弹出对话框后将值与上下文一起返回。
final bool delete = await _showDialog();
print(delete);
Future<bool> _showDialog() {
bool result;
showDialog(
context: context,
builder: (BuildContext context) {
return AlertDialog(
title: Text('Delete Appointment'),
content: Text(
'Are you sure? \nThis action cannot undo.',
style: TextStyle(
color: Colors.red,
fontSize: 20
),
),
actions: <Widget>[
FlatButton(
color: Colors.blue,
child: Text(
'CANCEL',
style: TextStyle(
color: Colors.white,
fontSize: 20
),
),
onPressed: () {
setState(() => result = false);
//print(result);
Navigator.pop(context, result);
return Future.value(result);
},
),
SizedBox(
width: 50,
),
FlatButton(
color: Colors.red,
child: Text(
'CONFIRM',
style: TextStyle(
color: Colors.white,
fontSize: 20
),
),
onPressed: () {
setState(() => result = true);
//print(result);
Navigator.pop(context, result);
return Future.value(result);
},
)
],
);
}
);
}