I'm stuck to create rfid card in ios app and create .pkpass file then add into apple wallet using flutter

Question

this is my code in this doesn't create an RFID card and pk pass I want to create an RFID/NFC card in my app and create a pk pass file and add it to the apple wallet I search several websites but I didn't find that error inside it. if you face this kind of problems please help me

   

    final _saveCard = StreamBuilder(
      stream: bloc.savecardValid,
      builder: (context, snapshot) {
        return Container(
          width: MediaQuery.of(context).size.width - 40,
          height: 50,
          child: RaisedButton(
            child: Text(
              'Save Card',
              style: TextStyle(color: Colors.white),
            ),
            color: Colors.lightBlue,
            onPressed: snapshot.hasData
                ? () {
                    var blocProviderCardWallet = BlocProvider(
                      bloc: bloc,
                      child: CardWallet(),
                    );
                    Navigator.push(
                        context,
                        MaterialPageRoute(
                            builder: (context) => blocProviderCardWallet));
                  }
                : null,
          ),
        );
      },
    );