Riverpod : Alternate way of overriding initState inside ConsumerWidget

Updated

From Riverpod v1.0.0-dev.2

You can use ConsumerStatefulWidget and ConsumerState

final helloWorldProvider = Provider((_) => 'Hello world');class RiverpodExample extends ConsumerStatefulWidget {  @override _RiverpodExampleState createState() => _RiverpodExampleState();}class _RiverpodExampleState extends ConsumerState<Example> {  @override  void initState() {    super.initState();    final value = ref.read(helloWorldProvider);  }  @override  Widget build(BuildContext context) {    final value = ref.watch(helloWorldProvider);    return Text(value); // Hello world  }}

or add ConsumerStateMixin mixin to your StatefulWidget class

class StatefulExample extends StatefulWidget {  @override  _StatefulExampleState createState() => _StatefulExampleState();}class _StatefulExampleState extends State<StatefulExample> with ConsumerStateMixin {  void initState() {    super.initState();    // You can access WidgetReference (ref)    final value = ref.read(helloWorldProvider);  }  @override  Widget build(BuildContext context) {    A value = ref.watch(a);        return Container();  }}

Have a look at this issue - https://github.com/rrousselGit/river_pod/issues/335

Up to Riverpod v0.14.0+3

You have to use StatefulWidget and return Consumer as a root widget from the build method.

Consumer

Consumer can be used to listen to providers inside a StatefulWidget orto rebuild as few widgets as possible when a provider updates.

final helloWorldProvider = Provider((_) => 'Hello world');class RiverpodExample extends StatefulWidget {  @override  _RiverpodExampleState createState() => _RiverpodExampleState();}class _RiverpodExampleState extends State<Example> {  @override  void initState() {    super.initState();  }  @override  Widget build(BuildContext context) {    return Consumer(      builder: (context, watch, child) {        final value = watch(helloWorldProvider);        return Text(value); // Hello world      },    );  }}

I'm not totally sure how to answer your question as I have not worked with ConsumerWidget. I'd presume the idea is to keep most of your state in providers.

However, I would like to recommend using hooks_riverpod alongside flutter_hooks (same developer).

This makes keeping state local to the widget simple and also provides easy access to providers.

For example:

class Example extends HookWidget {  const Example({Key key}) : super(key: key);  @override  Widget build(BuildContext context) {    final test = useProvider(Test.provider());    final controller = useTextEditingController();    final loading = useState(false);    final buttonText = useState('Change me!');    return Column(      children: [        TextField(controller: controller),        if (!loading) RaisedButton(          onPressed: () async {            loading.value = true;            await Future.delayed(const Duration(seconds: 1));            buttonText.value = controller.text;            loading.value = false;          }          child: Text(buttonText.value),        ),        if (loading) const CircularProgressIndicator(),        // Do something with providers, etc.      ],    ),  );}

Just a quick example, but there are plenty of resources (flutter_hooks, hooks_riverpod) to help you along. Also, check out examples from the developer on riverpod hooks usage.

I may be late but with the upcoming 1.0.0 of Riverpod you will be able to use https://pub.dev/documentation/flutter_riverpod/1.0.0-dev.2/flutter_riverpod/ConsumerStatefulWidget-class.html and https://pub.dev/documentation/flutter_riverpod/1.0.0-dev.2/flutter_riverpod/ConsumerState-class.html, which does exactly what you want.