Cant Change pdfData from setState

[kttary]

I fill PDFView version ^1.1.0 with pdfData and i want to change the pdfData later by means of setState. Unfortunately the PDFView doesnt changed. Here is my code:

import 'dart:async';
import 'dart:typed_data';
import 'package:flutter/material.dart';

import 'package:flutter/services.dart';
import 'package:flutter_pdfview/flutter_pdfview.dart';

import 'package:flutter/foundation.dart';
import 'package:path_provider/path_provider.dart';

class PdfViewTest extends StatefulWidget {

  final Uint8List data;
  PdfViewTest({Key key = const Key("PdfView Test"), required this.data}) : super(key: key);

  @override
  _PdfViewTestState createState() => _PdfViewTestState();
}

class _PdfViewTestState extends State<PdfViewTest> {
  Uint8List? pdfData;

  @override
  void initState() {
    pdfData = widget.data;
    super.initState();
  }

  Future<void> fromAssetToData(String asset, String filename) async {
    Completer<Uint8List> completer = Completer();

    try {
      var dir = await getApplicationDocumentsDirectory();
      var data = await rootBundle.load(asset);
      Uint8List bytes = data.buffer.asUint8List();

      setState(() {
        pdfData = bytes;
      });
    } catch (e) {
      throw Exception('Error parsing asset file!');
    }
  }

  @override
  Widget build(BuildContext context) {
    final Completer<PDFViewController> _controller = Completer<PDFViewController>();
    int pages = 0;
    int currentPage = 0;
    bool isReady = false;
    String errorMessage = '';

    return
      Scaffold(
          appBar: AppBar(
            title: Text("PDF Viewer"),
          ),
          body: PDFView(
            pdfData: pdfData,
            enableSwipe: true,
            swipeHorizontal: true,
            autoSpacing: false,
            pageFling: true,
            pageSnap: true,
            defaultPage: currentPage,
            fitPolicy: FitPolicy.BOTH,
            preventLinkNavigation:
            false, // if set to true the link is handled in flutter
            onRender: (_pages) {
              setState(() {
                pages = _pages!;
                isReady = true;
              });
            },
            onError: (error) {
              setState(() {
                errorMessage = error.toString();
              });
              print(error.toString());
            },
            onPageError: (page, error) {
              setState(() {
                errorMessage = '$page: ${error.toString()}';
              });
              print('$page: ${error.toString()}');
            },
            onViewCreated: (PDFViewController pdfViewController) {
              _controller.complete(pdfViewController);
            },
          ),
          persistentFooterButtons: [
            Container(
              width: MediaQuery.of(context).copyWith().size.width,
              child: Row(
                children: [
                  Expanded(
                    child: TextButton(
                      child: Text('Open Demo'),
                      onPressed: (){
                        fromAssetToData('assets/demo-link.pdf', 'demo.pdf');
                      },
                    ),
                  )
                ],
              ),
            )
          ]
      );
  }
}

i call PdfViewTest from other screen as follow:

ElevatedButton(
      child: Text("Scan"),
      onPressed: () {
      Navigator.push(
        context,
        MaterialPageRoute(builder: (context) => PdfViewTest(data: initPdfData!)),
      );
}),

and the initPdfData is populated on initState:

Uint8List? initPdfData;

@override
  void initState() {
    super.initState();

    fromAsset('assets/demo-landscape.pdf', 'demo-landscape.pdf').then((f) {
    });
}

Future<void> fromAsset(String asset, String filename) async {
    Completer<File> completer = Completer();

    try {
      var dir = await getApplicationDocumentsDirectory();
      File file = File("${dir.path}/$filename");
      var data = await rootBundle.load(asset);
      initPdfData = data.buffer.asUint8List();
    } catch (e) {
      throw Exception('Error parsing asset file!');
    }

  }

[shinxxxxwon]

Did you solve this problem?

[maurojohann]

Did you solve this problem?

add a key to the pdfViewer widget, this will make the build method recognize that this widget has also been changed and needs to be repainted