Flutter the right way to print to printer in ios

I am making a operate to print in android and ios with flutter.
I discovered printing whereas trying to find a printing plugin.
I’ve applied pdf creation and printing by way of examples on this plugin.
In Android, it was printed usually, however in IOS, an error occurred.

Error

I assumed this was a problem with the widgets within the MaterialApp and CupertinoApp relying on the platform.

So I set the Widget in keeping with the Platform.

button widget

Widget _wifiButton(BuildContext context){
    return Expanded(
      flex: 1,
      youngster: Container(
        width: this.dimension!.width,
        top: this.dimension!.top,
        alignment: Alignment.heart,
        ornament: BoxDecoration(
          coloration: Colours.blue,
          borderRadius: BorderRadius.round(8.0),
        ),
        youngster: Platform.isAndroid ? TextButton(
          onPressed: () async {
            Navigator.push(
              context,
              MaterialPageRoute(builder: (context) => WifiPrint())
            );
          },
          youngster: Textual content(
            'W i - F i',
            model: TextStyle(
              fontWeight: FontWeight.daring,
              coloration: Colours.white
            ),
          ),
        ) : CupertinoButton(
          onPressed: () async {
            Navigator.push(
              context,
              CupertinoPageRoute(builder: (context) => WifiPrint()),
            );
          },
          youngster: Textual content(
            'W i - F i',
            model: TextStyle(
                fontWeight: FontWeight.daring,
                coloration: Colours.white
            ),
          ),
        ),
      ),
    );
  }

class WifiPrint

@override
  Widget construct(BuildContext context) {
    return Platform.isAndroid
        ? MaterialApp(
        house: Scaffold(
          physique: PdfPreview(
            construct: (format) => _generatePdf(format, context),
          ),
        )
    )
        : CupertinoApp(
      house: CupertinoPageScaffold(
        youngster: PdfPreview(
            construct: (format) => _generatePdf(format, context),
        ),
      ),
    );
  }

  Future<Uint8List> _generatePdf(PdfPageFormat format,
      BuildContext context) async {
    ultimate pdf = pdfWidget.Doc(model: PdfVersion.pdf_1_5, compress: true);

    //ultimate String documentPath = (await getTemporaryDirectory()).path;

    for (int nCount = 0; nCount < Supplier.of<ScoreProvider>(context, pay attention: false).scoreImageList.size; nCount++) {
      ultimate picture = await imageFromAssetBundle('${Supplier.of<ScoreProvider>(context, pay attention: false).scoreImageList[nCount]}');

      pdf.addPage(
          pdfWidget.Web page(
              pageFormat: format,
              construct: (pdfWidget.Context context) {
                return pdfWidget.Middle(
                  youngster: pdfWidget.Padding(
                    padding: pdfWidget.EdgeInsets.zero,
                    youngster: pdfWidget.Picture(picture, match: pdfWidget.BoxFit.fill),
                  ),
                );
              }
          )
      );
    }
    return pdf.save();
  }

However I acquired the identical error. Are you aware the right way to resolve this downside?