#事件監(jiān)聽
  event_bus: ^1.1.1

事件代碼

import 'package:event_bus/event_bus.dart';
class TestEventBus {
  static final TestEventBus _gInstance = TestEventBus._init();

  EventBus _eventBus = EventBus();

  TestEventBus._init() {
    ///
  }

  factory TestEventBus() {
    return _gInstance;
  }

  EventBus get bus {
    return _eventBus;
  }
}

使用：

創(chuàng)建事件
class ProgressEvents {
  String data;///傳輸數(shù)據(jù)就在這里加
  ProgressEvents({this.data});
}
觸發(fā)的地方：
     ProgressEventBus().bus.fire(ProgressEvents(data: ''));
監(jiān)聽的地方：
    ProgressEventBus().bus.on<ProgressEvents>().listen((event) {
      if (!mounted) return;

    });
///取消訂閱 
  StreamSubscription subscription;
subscription=ProgressEventBus().bus.on<ProgressEvents>().listen((event) {
      if (!mounted) return;

    });
  @override
  void dispose() {
    // TODO: implement dispose
    super.dispose();
    if (subscription != null) {
      subscription.cancel();
    }
  }

注：監(jiān)聽應比觸發(fā)早。