■ TextFormField 클래스의 validator 속성을 사용해 입력 값을 검증하는 방법을 보여준다.
▶ main.dart
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import 'package:flutter/material.dart'; void main() => runApp(TestApplication()); class TestApplication extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Test Application', home: Scaffold( appBar: AppBar( title: Text('Test Application'), ), body: MainPage(), ), ); } } class MainPage extends StatefulWidget { @override _MainPageState createState() => _MainPageState(); } class _MainPageState extends State<MainPage> { final GlobalKey<FormState> _formKey = GlobalKey<FormState>(); @override Widget build(BuildContext context) { return Padding( padding: const EdgeInsets.all(16.0), child: Form( key: _formKey, child: Column( crossAxisAlignment: CrossAxisAlignment.start, children: <Widget>[ TextFormField( validator: (value) { if (value.isEmpty) { return '주소를 입력해 주시기 바랍니다.'; } return null; }, ), Padding( padding: const EdgeInsets.symmetric(vertical: 16.0), child: RaisedButton( child: Text('검증'), onPressed: () { if (_formKey.currentState.validate()) { Scaffold.of(context).showSnackBar(SnackBar(content: Text('정상적으로 입력되었습니다.'))); } }, ), ), ], ), ), ); } } |