setState method

void setState(void fn())

Notifies the framework that the internal state has changed, triggering a rebuild.

Implementation

void setState(void Function() fn) {
  assert(mounted, 'setState() called after dispose()');
  try {
    fn();
    _element?.markNeedsBuild();
  } on Exception catch (e) {
    assert(() {
      throw StateError('setState() callback failed: $e');
    }());
  }
}