方法“transform”未在超类中定义
方法“transform”未在超类中定义
提问于 2021-09-02 11:58:02
我是flutter_bloc模式的初学者，我正在尝试使用bloc进行文本搜索。问题是当我在下面使用这段代码时：
import 'package:rxdart/rxdart.dart';
import 'package:bloc/bloc.dart';
class SearchBloc extends Bloc<SearchEvent, SearchState> {
SearchRestaurantDataService searchRestaurantDataService;
@override
Stream<LoadedAllRestaurantState> transform(
Stream<LoadSearchRestaurantEvent> events,
Stream<LoadedAllRestaurantState> Function(LoadSearchRestaurantEvent event)
next) {
return super.transform( //Here getting error "The method 'transform' isn't defined in a superclass of 'SearchBloc'."
(events as PublishSubject<LoadSearchRestaurantEvent>)
.debounceTime(Duration(milliseconds: 1000)),
next);
}
}得到一个转换错误，我知道这段代码已经过时了，因为这段代码在1-2年前就已经过时了。有人能提供此transform错误的更新代码吗？
回答 1
Stack Overflow用户
回答已采纳
发布于 2021-09-05 01:04:33
改用transformEvents！
import 'package:rxdart/rxdart.dart';
@override
Stream<Transition<SearchEvent, SearchState>> transformEvents(
Stream<CounterEvent> events,
TransitionFunction<CounterEvent, SearchState> transitionFn,
) {
final nonDebounceStream =
events.where((event) => event is! LoadSearchRestaurantEvent);
final debounceStream = events
.whereType<LoadSearchRestaurantEvent>()
.throttleTime(const Duration(milliseconds: 1000));
return super.transformEvents(
Rx.merge([nonDebounceStream, debounceStream]),
transitionFn,
);
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/69029839
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