GlobalKey Using child acess In Flutter

GlobalKey_Access.dart
import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData( primarySwatch: Colors.blue, ), home: HomeApp(), ); } } class HomeApp extends StatelessWidget { final GlobalKey<_HomePageState> globalKey = GlobalKey(); @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( appBar: AppBar( title: Text('Global Acess'), ), body: Column(mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ IconButton( icon: Icon(Icons.help), onPressed: () { globalKey.currentState.methodA(); }, ), HomePage(key: globalKey), ], )), ); } } class HomePage extends StatefulWidget { HomePage({Key key}) : super(key: key); @override _HomePageState createState() => _HomePageState(); } class _HomePageState extends State<HomePage> { String name = "Hi"; @override Widget build(BuildContext context) { return Text(name); } void methodA() { setState(() { name = "Welcome"; }); } }
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