指定时，未为该类指定Flutter getter

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我要

[dart]没有为该类定义getter'currentPickup' PickupEvent [undefined_getter]

[dart] The getter 'currentPickup' isn't defined for the class PickupEvent[undefined_getter]

event.currentPickup错误:

error on event.currentPickup:

import 'dart:async'; import 'package:bloc/bloc.dart'; import 'pickup.dart'; import '../../../models/models.dart'; class PickupBloc extends Bloc<PickupEvent, PickupState> { @override Stream<PickupState> mapEventToState(PickupState state, PickupEvent event) async* { if (state.isNotRunning) { stopwatch.start(); timer = new Timer.periodic(new Duration(milliseconds: 200), updateTime); yield PickupState.running(); } if (state.isRunning) { stopwatch.stop(); timer.cancel(); _pushPickup(event.currentPickup); yield PickupState.done(); } }

在PickupEvent类中指定吸气剂并将其正确导入Pickup.dart中时.

When the getter is specified in the PickupEvent class and properly imported in pickup.dart.

import '../../../models/models.dart'; abstract class PickupEvent {} class ButtonPressed extends PickupEvent { final PickupModel currentPickup; ButtonPressed({ @required this.currentPickup }); }

有什么想法会导致这种情况吗?

Any idea what could cause this ?

推荐答案

错误消息正确. ButtonPressed具有这种吸气剂，但PickupEvent没有.

The error message is correct. ButtonPressed has such a getter, but PickupEvent does not.

您可以将抽象吸气剂添加到基类中

You can either add an abstract getter to the base class

abstract class PickupEvent { PickupModel get currentPickup; }

或像

_pushPickup((event as ButtonPressed).currentPickup);

，如果您确定它将是ButtonPressed.

if you are sure it will be a ButtonPressed.

您也可以

if(event is ButtonPressed) { _pushPickup(event.currentPickup); }