Question

我在MultiBlocProvider中创建了集团，它的子级是一个BlocBuilder，但是返回了一个事件{p>

MultiBlocListener

我得到了BlocProvider.of<PhoneAuthenticationBloc>(context).add(VerifyPhoneNumberEvent(phoneNumber: controller.text.replaceAll(' ', '')));，而其他集团则正常工作。

您能发现BlocProvider.of() called with a context that does not contain a Bloc of type PhoneAuthenticationBloc出什么问题吗？

PhoneAuthenticationBloc()

 @override
  Widget build(BuildContext context) {
    return MultiBlocProvider(
      providers: [
        BlocProvider<PhoneAuthenticationBloc>(
          create: (context) => PhoneAuthenticationBloc(userRepository: UserRepository()),
        ),
//        BlocProvider<AuthenticationBloc>(
//          create: (context) => AuthenticationBloc(userRepository: UserRepository()),
//          lazy: false,
//        ),
//        BlocProvider<UserBloc>(
//          create: (context) => UserBloc(),
//          lazy: false,
//        ),
        BlocProvider<BookingBloc>(
          create: (context) => BookingBloc(user: widget.user),
        ),
        BlocProvider<OrderBloc>(
          create: (context) => OrderBloc(user: widget.user),
        ),
        BlocProvider<PaymentBloc>(
          create: (context) => PaymentBloc(user: widget.user),
          lazy: false,
        ),
        BlocProvider<CartBloc>(
          create: (context) => CartBloc()..add(LoadCart()),
        ),
      ],
    child: BlocBuilder<PaymentBloc, PaymentState>(
          builder: (context, state) {
          if (state is InitialStatePayment) {
            return MultiBlocListener(
                listeners: [
                  BlocListener<PhoneAuthenticationBloc, AuthenticationState>(
                    listener: (BuildContext context, AuthenticationState state){
...


FlatButton.icon(
                                    color: Colors.orange,
                                    onPressed: () {
                                      print('pay pressed');
                                      print(
                                          'bookingStart is ${widget.bookingStart}, selected shop is ${widget.selectedShop}');
                                     if (isVerified == true){
                                       ...
                                     }
                                      else{
                                        showDialog(
                                          context: context,
                                          barrierDismissible: false,
                                          builder: (BuildContext context){
                                            return SingleChildScrollView(
                                              child: ValidatePhoneDialog(
                                                controller: controller,
                                                  onPressed: (){
                                                  if (controller.text.length >= 9){
                                                    Navigator.pop(context);
                                                    showDialog(
                                                      context:context,
                                                      barrierDismissible: false,
                                                      builder: (BuildContext context){
                                                        return VerifyingDialog();
                                                      }
                                                    );
                                                    BlocProvider.of<PhoneAuthenticationBloc>(context).add(VerifyPhoneNumberEvent(phoneNumber: controller.text.replaceAll(' ', '')));
                                                  } else {
                                                    scaffoldKey.currentState.showSnackBar(SnackBar(
                                                        backgroundColor: Colors.redAccent,
                                                        content: Text(
                                                            AppLocalizations.instance
                                                                .text('Wrong number'),
                                                            style: TextStyle(color: Colors.white))));
                                                  }
                                                  }
                                              ),
                                            );
                                          }
                                        );
                                     }



                                    },
                                    icon: Icon(
                                      Icons.payment,
                                      color: Colors.white,
                                    ),
                                    label: Text(
                                      AppLocalizations.instance.text('Pay'),
                                      style: TextStyle(
                                          color: Colors.white, fontSize: 20),
                                    )),

Answer 1

添加事件时，您使用了错误的上下文。显示对话框时，小部件将放置在bloc提供程序上方的覆盖层中，因此，通过使用对话框的上下文，您无法找到bloc，因为其上方没有提供程序。

要将此名称固定为对话框上下文的其他名称（例如，dialogContext），以便在进行BlocProvider.of(context)时，上下文是指显示对话框的窗口小部件的上下文，而不是对话框本身的上下文。 / p>

使用不包含PhoneAuthenticationBloc类型的Bloc的上下文调用BlocProvider.of（）。扑

1 个答案: