尝试使用pdf函数打印flutter中的表格后，出现错误“未定义命名参数”body“,”

qkf9rpyu  于 2022-11-30  发布在  Flutter
关注(0)|答案(1)|浏览(85)

因此，我得到错误“命名参数'body'是没有定义。”在我尝试使用到pdf函数打印一个表后，这里使用的主要包是package：pdf/widgets.dart' as pw。我创建了一个时间表，我想显示它，当我点击我的pdf按钮，但当我写的代码表内我的doc.addpage我得到的错误体是没有定义。
我的代码如下：
已导入包...

class TableWidget extends StatefulWidget {
  const TableWidget({Key? key}) : super(key: key);

  @override
  _TableState createState() => _TableState();

}

class _TableState extends State<TableWidget> {
  @override

  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
          appBar: AppBar(
            automaticallyImplyLeading: true,
            title: const Text('Timetable Generated'),
          ),
          body: Center(
              child: Column(children: <Widget>[
            Container(
              padding: const EdgeInsets.all(5),
              margin: const EdgeInsets.all(5),
              width: double.infinity,
              child: Table(
                defaultColumnWidth: const FlexColumnWidth(1.0),
                border: TableBorder.all(
                    color: Colors.black, style: BorderStyle.solid, width: 1),
                children: [
                  TableRow(children: [
                    Column(children: const [
                      Text('', style: TextStyle(fontSize: 20.0))
                    ]),
                    Column(children: const [
                      Text('Lesson 1 \n 08:05 - 08:45',
                          style: TextStyle(fontSize: 15.0))
                    ]),
                    Column(children: const [
                      Text('Lesson 2 \n 09:00 - 09:40',
                          style: TextStyle(fontSize: 15.0))
                    ]),
                    Column(children: const [
                      Text('Lesson 3 \n 09:50 - 10:30',
                          style: TextStyle(fontSize: 15.0))
                    ]),
                    Column(children: const [
                      Text('Lesson 4 \n 10:40 - 11:20',
                          style: TextStyle(fontSize: 15.0))
                    ]),
                    Column(children: const [
                      Text('Lesson 5 \n 11:30 - 12:10',
                          style: TextStyle(fontSize: 15.0))
                    ]),
                    Column(children: const [
                      Text('Lesson 6 \n 12:20 - 13:00',
                          style: TextStyle(fontSize: 15.0))
                    ]),
                    Column(children: const [
                      Text('Lesson 7 \n 14:00 - 14:40',
                          style: TextStyle(fontSize: 15.0))
                    ]),
                  ]),
                  TableRow(children: [
                    Column(children: const [
                      Text('Mo', style: TextStyle(fontSize: 20.0))
                    ]),
                    Column(children: const [
                      Text('Turkish', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Geography', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Physics', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Physics', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Maths', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Business', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Business', style: TextStyle(fontSize: 12.0))
                    ]),
                  ]),
                  TableRow(children: [
                    Column(children: const [
                      Text('Tu', style: TextStyle(fontSize: 20.0))
                    ]),
                    Column(children: const [
                      Text('Portuguese', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Portuguese', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Chemistry', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Chemistry', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Biology', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('PE', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('PE', style: TextStyle(fontSize: 12.0))
                    ]),
                  ]),
                  TableRow(children: [
                    Column(children: const [
                      Text('We', style: TextStyle(fontSize: 20.0))
                    ]),
                    Column(children: const [
                      Text('English', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('English', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Computer', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Portuguese', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Chemistry', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Biology', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('CVC', style: TextStyle(fontSize: 12.0))
                    ]),
                  ]),
                  TableRow(children: [
                    Column(children: const [
                      Text('Thu', style: TextStyle(fontSize: 20.0))
                    ]),
                    Column(children: const [
                      Text('Biology', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Computer', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('English', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('English', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('History', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Maths', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Maths', style: TextStyle(fontSize: 12.0))
                    ]),
                  ]),
                  TableRow(children: [
                    Column(children: const [
                      Text('Fri', style: TextStyle(fontSize: 20.0))
                    ]),
                    Column(children: const [
                      Text('Maths', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Maths', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Accounting', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Accounting', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Physics', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('-', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('-', style: TextStyle(fontSize: 12.0))
                    ]),
                  ]),
                ],
              ),
            ),
            TextButton(
                style: TextButton.styleFrom(
                    fixedSize: const Size.square(40),
                    padding: const EdgeInsets.all(2),
                    foregroundColor: Colors.white,
                    backgroundColor: Colors.green),
                onPressed: _createExcel,
                child: const Text('To Excel')),

            TextButton(
                style: TextButton.styleFrom(
                  fixedSize: const Size.square(30),
                  padding: const EdgeInsets.all(5),
                  foregroundColor: Colors.white,
                  backgroundColor: Colors.red,
                ),
                onPressed: _createPdf,
                child: const Text('To PDF')),
          ]))),
    );
  }
//Buttons

//Create PDF and display text
  void _createPdf() async {
    final doc = pw.Document();
    
    /// for using an image from assets
    // final image = await imageFromAssetBundle('assets/image.png');

    doc.addPage(
      pw.Page(
        pageFormat: PdfPageFormat.a4,
        build: (pw.Context context) {
          return pw.Center(
            body: Center(
              child: Column(children: <Widget>[
              Container(
              padding: const EdgeInsets.all(5),
              margin: const EdgeInsets.all(5),
              width: double.infinity,
              child: Table(
                defaultColumnWidth: const FlexColumnWidth(1.0),
                border: TableBorder.all(
                    color: Colors.black, style: BorderStyle.solid, width: 1),
                children: [
                  TableRow(children: [
                    Column(children: const [
                      Text('', style: TextStyle(fontSize: 20.0))
                    ]),
                    Column(children: const [
                      Text('Lesson 1 \n 08:05 - 08:45',
                          style: TextStyle(fontSize: 15.0))
                    ]),
                    Column(children: const [
                      Text('Lesson 2 \n 09:00 - 09:40',
                          style: TextStyle(fontSize: 15.0))
                    ]),
                    Column(children: const [
                      Text('Lesson 3 \n 09:50 - 10:30',
                          style: TextStyle(fontSize: 15.0))
                    ]),
                    Column(children: const [
                      Text('Lesson 4 \n 10:40 - 11:20',
                          style: TextStyle(fontSize: 15.0))
                    ]),
                    Column(children: const [
                      Text('Lesson 5 \n 11:30 - 12:10',
                          style: TextStyle(fontSize: 15.0))
                    ]),
                    Column(children: const [
                      Text('Lesson 6 \n 12:20 - 13:00',
                          style: TextStyle(fontSize: 15.0))
                    ]),
                    Column(children: const [
                      Text('Lesson 7 \n 14:00 - 14:40',
                          style: TextStyle(fontSize: 15.0))
                    ]),
                  ]),
                  TableRow(children: [
                    Column(children: const [
                      Text('Mo', style: TextStyle(fontSize: 20.0))
                    ]),
                    Column(children: const [
                      Text('Turkish', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Geography', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Physics', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Physics', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Maths', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Business', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Business', style: TextStyle(fontSize: 12.0))
                    ]),
                  ]),
                  TableRow(children: [
                    Column(children: const [
                      Text('Tu', style: TextStyle(fontSize: 20.0))
                    ]),
                    Column(children: const [
                      Text('Portuguese', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Portuguese', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Chemistry', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Chemistry', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Biology', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('PE', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('PE', style: TextStyle(fontSize: 12.0))
                    ]),
                  ]),
                  TableRow(children: [
                    Column(children: const [
                      Text('We', style: TextStyle(fontSize: 20.0))
                    ]),
                    Column(children: const [
                      Text('English', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('English', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Computer', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Portuguese', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Chemistry', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Biology', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('CVC', style: TextStyle(fontSize: 12.0))
                    ]),
                  ]),
                  TableRow(children: [
                    Column(children: const [
                      Text('Thu', style: TextStyle(fontSize: 20.0))
                    ]),
                    Column(children: const [
                      Text('Biology', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Computer', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('English', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('English', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('History', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Maths', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Maths', style: TextStyle(fontSize: 12.0))
                    ]),
                  ]),
                  TableRow(children: [
                    Column(children: const [
                      Text('Fri', style: TextStyle(fontSize: 20.0))
                    ]),
                    Column(children: const [
                      Text('Maths', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Maths', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Accounting', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Accounting', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('Physics', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('-', style: TextStyle(fontSize: 12.0))
                    ]),
                    Column(children: const [
                      Text('-', style: TextStyle(fontSize: 12.0))
                    ]),
                  ]),
                ],
              ),
            ),]))); // Center
        },
      ),
    );
    await Printing.layoutPdf(
        onLayout: (PdfPageFormat format) async => doc.save());
    //To share to other apps
    await Printing.sharePdf(
        bytes: await doc.save(), filename: 'my-document.pdf');

  }
flutter

1条答案

按热度按时间
bvn4nwqk

bvn4nwqk1#

您需要在此处将body更改为child：
而不是：

return pw.Center(
        body: Center(
  // ...

将其替换为：

return pw.Center(
        child: Center(
  // ...

只有Scaffold小组件接受body属性来设置窗口小组件，但其他Flutter小组件和pw.Center接受child属性。

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