将 Flutter 应用程序屏幕导出为 PDF

Question

有没有可能的方法将flutter应用程序屏幕导出为PDF，我正在寻找类似于屏幕截图功能，但它应该生成PDF而不是图片。

提前致谢

Answer 1

您可以这样使用 pdf/打印：

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:pdf/pdf.dart';
import 'package:pdf/widgets.dart' as pw;
import 'package:printing/printing.dart';

void main() {
  runApp(MaterialApp(home: MyApp()));
}

class MyApp extends StatelessWidget {
  final GlobalKey<State<StatefulWidget>> _printKey = GlobalKey();

  void _printScreen() {
    Printing.layoutPdf(onLayout: (PdfPageFormat format) async {
      final doc = pw.Document();

      final image = await WidgetWraper.fromKey(
        key: _printKey,
        pixelRatio: 2.0,
      );

      doc.addPage(pw.Page(
          pageFormat: format,
          build: (pw.Context context) {
            return pw.Center(
              child: pw.Expanded(
                child: pw.Image(image),
              ),
            );
          }));

      return doc.save();
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.spaceEvenly,
          children: <Widget>[
            RepaintBoundary(
              key: _printKey,
              child:
                  // This is the widget that will be printed.
                  const FlutterLogo(
                size: 300,
              ),
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        child: const Icon(Icons.print),
        onPressed: _printScreen,
      ),
    );
  }
}