在Flutter DataTable中对列值进行排序

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('DataTable Sorting')),
        body: DataTableExample(),
      ),
    );
  }
}

class DataTableExample extends StatefulWidget {
  @override
  _DataTableExampleState createState() => _DataTableExampleState();
}

class _DataTableExampleState extends State<DataTableExample> {
  List<Map<String, dynamic>> _data = [
    {'name': 'Alice', 'age': 30},
    {'name': 'Bob', 'age': 25},
    {'name': 'Charlie', 'age': 35},
  ];

  int _sortColumnIndex = 0;
  bool _sortAscending = true;

  void _sortData(int columnIndex) {
    setState(() {
      if (_sortColumnIndex == columnIndex) {
        _sortAscending = !_sortAscending;
      } else {
        _sortColumnIndex = columnIndex;
        _sortAscending = true;
      }

      _data.sort((a, b) {
        dynamic aValue = a.values.elementAt(_sortColumnIndex);
        dynamic bValue = b.values.elementAt(_sortColumnIndex);

        if (aValue is int && bValue is int) {
          return _sortAscending ? aValue.compareTo(bValue) : bValue.compareTo(aValue);
        } else {
          return _sortAscending ? aValue.toString().compareTo(bValue.toString()) : bValue.toString().compareTo(aValue.toString());
        }
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return DataTable(
      columns: [
        DataColumn(label: Text('Name'), numeric: false, onSort: _sortData),
        DataColumn(label: Text('Age'), numeric: true, onSort: _sortData),
      ],
      rows: _data.map((row) {
        return DataRow(cells: [
          DataCell(Text(row['name'])),
          DataCell(Text(row['age'].toString())),
        ]);
      }).toList(),
    );
  }
}