如何更改Flutter应用程序的默认字体系列

# pubspec.yaml
flutter:
  fonts:
    - family: 'CustomFont'
      fonts:
        - asset: assets/fonts/custom_font.ttf

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        fontFamily: 'CustomFont', // 设置默认字体系列
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Custom Font Example'),
      ),
      body: Center(
        child: Text(
          'Hello, World!',
          style: TextStyle(fontSize: 24), // 使用默认字体系列
        ),
      ),
    );
  }
}