waitState<T extends State<StatefulWidget>> function

FutureOr<void> waitState<T extends State<StatefulWidget>>(FutureOr<void> run(T), StateGetter<T> stateGetter, VoidCallback onFailed)

在同一个代码块中读取值 确保初始化时，state.mounted == true

通过throw退出循环

Implementation

FutureOr<void> waitState<T extends State>(FutureOr<void> Function(T) run,
    StateGetter<T> stateGetter, VoidCallback onFailed) async {
  Timer? timer;
  assert(() {
    timer = Timer(const Duration(seconds: 10), () {
      Log.e('获取`overlay`过长`overlayGetter`长时间无返回值', position: 2);
    });

    return true;
  }());

  while (true) {
    try {
      final overlaystate = stateGetter();
      if (overlaystate != null && overlaystate.mounted) {
        assert(() {
          timer?.cancel();
          return true;
        }());
        return run(overlaystate);
      }
    } on OverlayGetterError catch (e) {
      assert(Log.i(e));
      onFailed();
      break;
    } catch (e) {
      onFailed();
      Log.e('unKnownError: $e');
      break;
    }

    await waitForFrame();
  }
  assert(() {
    timer?.cancel();
    return true;
  }());
}