UnimplementedError (FLUTTER)
5,301
The createState()
method includes a TODO
comment:
@override
State<StatefulWidget> createState() {
// TODO: implement createState
throw UnimplementedError();
}
This comment is a kind reminder that we have something left to do.
However, the throw UnimplementedError()
makes the reminder less friendly, forcing us to complete our TODO
task and remove the UnimplementedError()
line to make it work:
MyAppState createState() => MyAppState();
Author by
Admin
Updated on December 26, 2022Comments
-
Admin 11 months
I'm super new at coding with Flutter and following this course that let's me create stateful widget. The problem is when I do, I get this throw UnimplementedError(); It should return to null. I have no clue what I'm doing wrong.
my code: import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends StatefulWidget { @override State<StatefulWidget> createState() { // TODO: implement createState throw UnimplementedError(); } } class MyAppState extends State<MyApp> { var questionIndex = 0; void answerQuestion() { setState(() { questionIndex = questionIndex + 1; }); print(questionIndex); } @override Widget build(BuildContext context) { var questions = [ "What's your favourite color?", "What's your favourite animal?", ]; return MaterialApp( home: Scaffold( appBar: AppBar( title: Text( "My First App", ), ), body: Column( children: [ Text( questions[questionIndex], ), RaisedButton( child: Text("Answer 1"), onPressed: answerQuestion, ), RaisedButton( child: Text("Answer 2"), onPressed: answerQuestion, ), RaisedButton( child: Text("Answer 3"), onPressed: answerQuestion, ) ], ), ), ); } }
Thank you,
Ciao!