useState<T> function

1. TinitialData

Creates a variable and subscribes to it.

WheneverValueNotifier.value updates, it will mark the callerHookWidgetas needing a build.On the first call, it initializesValueNotifier toinitialData.initialData is ignoredon subsequent calls.

The following example showcases a basic counter application:

class Counter extends HookWidget {  @override  Widget build(BuildContext context) {    final counter = useState(0);    return GestureDetector(      // automatically triggers a rebuild of the Counter widget      onTap: () => counter.value++,      child: Text(counter.value.toString()),    );  }}

See also:

• ValueNotifier
• useStreamController, an alternative toValueNotifier for state.

Implementation

ValueNotifier<T> useState<T>(T initialData) {  return use(_StateHook(initialData: initialData));}