FlutterFlow PDF Action Code

geraPdf.dart

// Automatic FlutterFlow imports
import '/backend/backend.dart';
import '/backend/schema/structs/index.dart';
import '/flutter_flow/flutter_flow_theme.dart';
import '/flutter_flow/flutter_flow_util.dart';
import '/custom_code/actions/index.dart'; // Imports other custom actions
import '/flutter_flow/custom_functions.dart'; // Imports custom functions
import 'package:flutter/material.dart';
// Begin custom action code
// DO NOT REMOVE OR MODIFY THE CODE ABOVE!

//import 'dart:js' as js;
import 'package:pdf/pdf.dart';
import 'dart:io';
import 'package:pdf/widgets.dart' as pw;
import 'dart:html' as html;

Future geraPDF() async {
  // Add your function code here!
  final doc = pw.Document();

  doc.addPage(
    pw.Page(
      build: (pw.Context context) => pw.Center(
        child: pw.Text('Hello World!'),
      ),
    ),
  );

  //final file = File('example.pdf');
  //await file.writeAsBytes(await pdf.save());

  // Gerar o PDF e obter os bytes
  List<int> pdfBytes = await doc.save();

  print("PDF GERADO");

  // Criar um Blob com os bytes do PDF
  final blob = html.Blob([Uint8List.fromList(pdfBytes)], 'application/pdf');

  // Criar uma URL para o Blob
  final url = html.Url.createObjectUrlFromBlob(blob);

  // Criar um elemento de âncora (<a>) e configurá-lo para download
  final anchor = html.AnchorElement(href: url)
    ..setAttribute("download", "documento.pdf")
    ..click();

  // Liberar a URL do Blob após o download
  html.Url.revokeObjectUrl(url);
}

Pubspec Dependencies:

pdf: ^3.10.6

Exemplo v1.