GlobalKey Using child acess In Flutter

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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