我正在使用flutter_bloc＆amp;管理状态的集合软件包。
在儿童页面中，我是初始化的bloc＆amp;返回父页面处理集体对象。
当我立即回到父母页面时，time bloc投掷错误 Unhandled Exception: Bad state: Cannot add new events after calling close是因为在负载上的子页面上，我在bloc中调用API。完成API后，哪个触发状态。当时已经处置了集体物体。
[ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: Bad state: Cannot add new events after calling close
E/flutter (17290): #0 _BroadcastStreamController.add (dart:async/broadcast_stream_controller.dart:249:24)
E/flutter (17290): #1 Subject._add (package:rxdart/src/subjects/subject.dart:124:16)
E/flutter (17290): #2 Subject.add (package:rxdart/src/subjects/subject.dart:118:5)
E/flutter (17290): #3 Bloc._bindStateSubject.<anonymous closure> (package:bloc/src/bloc.dart:90:23)
E/flutter (17290): #4 Stream.forEach.<anonymous closure>.<anonymous closure> (dart:async/stream.dart:814:45)
E/flutter (17290): #5 _runUserCode (dart:async/stream_pipe.dart:11:23)
E/flutter (17290): #6 Stream.forEach.<anonymous closure> (dart:async/stream.dart:814:11)
E/flutter (17290): #7 _rootRunUnary (dart:async/zone.dart:1132:38)
E/flutter (17290): #8 _CustomZone.runUnary (dart:async/zone.dart:1029:19)
E/flutter (17290): #9 _CustomZone.runUnaryGuarded (dart:async/zone.dart:931:7)
E/flutter (17290): #10 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:336:11)
E/flutter (17290): #11 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:263:7)
E/flutter (17290): #12 _SyncBroadcastStreamController._sendData (dart:async/broadcast_stream_controller.dart:375:20)
E/flutter (17290): #13 _BroadcastStreamController._add (dart:async/broadcast_stream_controller.dart:287:5)
E/flutter (17290): #14 _rootRunUnary (dart:async/zone.dart:1132:38)
E/flutter (17290): #15 _CustomZone.runUnary (dart:async/zone.dart:1029:19)
E/flutter (17290): #16 _CustomZone.runUnaryGuarded (dart:async/zone.dart:931:7)
E/flutter (17290): #17 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:336:11)
E/flutter (17290): #18 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:263:7)
E/flutter (17290): #19 _ForwardingStreamSubscription._add (dart:async/stream_pipe.dart:132:11)
E/flutter (17290): #20 _ForwardingStream._handleData (dart:async/stream_pipe.dart:98:10)
E/flutter (17290): #21 _ForwardingStreamSubscription._handleData (dart:async/stream_pipe.dart:164:13)
E/flutter (17290): #22 _rootRunUnary (dart:async/zone.dart:1132:38)
E/flutter (17290): #23 _CustomZone.runUnary (dart:async/zone.dart:1029:19)
E/flutter (17290): #24 _CustomZone.runUnaryGuarded (dart:async/zone.dart:931:7)
E/flutter (17290): #25 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:336:11)
E/flutter (17290): #26 _DelayedData.perform (dart:async/stream_impl.dart:591:14)
E/flutter (17290): #27 _StreamImplEvents.handleNext (dart:async/stream_impl.dart:707:11)
E/flutter (17290): #28 _PendingEvents.schedule.<anonymous closure> (dart:async/stream_impl.dart:667:7)
E/flutter (17290): #29 _rootRun (dart:async/zone.dart:1120:38)
E/flutter (17290): #30 _CustomZone.run (dart:async/zone.dart:1021:19)
E/flutter (17290): #31 _CustomZone.runGuarded (dart:async/zone.dart:923:7)
E/flutter (17290): #32 _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:963:23)
E/flutter (17290): #33 _rootRun (dart:async/zone.dart:1124:13)
E/flutter (17290): #34 _CustomZone.run (dart:async/zone.dart:1021:19)
E/flutter (17290): #35 _CustomZone.runGuarded (dart:async/zone.dart:923:7)
E/flutter (17290): #36 _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:963:23)
E/flutter (17290): #37 _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
E/flutter (17290): #38 _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
那么，当集团已经处置时如何处理这些？
对父母和子女使用普通集团。在呼叫孩子时在父母中创建/初始化集团如下：
`BlocProvider.value( value: BlocProvider.of<BlocA>(context), child: ScreenA(), );`
通过上面写作，您将使集团无处不在，然后，您可以像以下几个儿童中访问集团：
BlocProvider.of<BlocA>(context)
只是不要把它撒在孩子里，然后，当您从孩子身上回到父母时，您的集团不会被处置，只有在父母销毁或处置时才会处置。
所有内容都写在这里：https://pub.dev/packages/flutter_bloc