Kas saak anda näite StreamBuilder komponendi kasutamisest kasutajaliidese reaalajas uuendamiseks?

The StreamBuilder component in Flutter is used to build an interface that updates in real time when new data arrives from a stream. For example, if you have a stream of numbers that emits a new value every second, StreamBuilder will automatically update the widget with that number.

Example:

Stream<int> counter() async* {
  int i = 0;
  while (true) {
    await Future.delayed(Duration(seconds: 1));
    yield i++;
  }
}

class CounterWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StreamBuilder<int>(
      stream: counter(),
      builder: (context, snapshot) {
        if (snapshot.hasData) {
          return Text('Counter: \\${snapshot.data}');
        } else {
          return CircularProgressIndicator();
        }
      },
    );
  }
}

In this example, the text on the screen will update every second, showing the current value of the counter.