H5_Flutter/lib/utils/custom_font.dart

import 'package:web_fonts/web_fonts.dart';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:web_fonts/fonts/web_fonts_descriptor.dart';
import 'package:web_fonts/fonts/web_fonts_variant.dart';

class SiyuanFont {
  static const _fontFamily = 'Siyuan';
  static bool _registered = false;
  static register(){
    if (_registered){
      return;
    }

    WebFonts.register(_fontFamily, {
      const WebFontsVariant(
        fontWeight: FontWeight.w300,
        fontStyle: FontStyle.normal,
      ): WebFontsFile(
        'http://liveplus-static.oss-cn-beijing.aliyuncs.com/link/dev/h5/assets/fonts/SourceHanSansCN-Regular.otf',
      ),
      const WebFontsVariant(
        fontWeight: FontWeight.w500,
        fontStyle: FontStyle.normal,
      ): WebFontsFile(
        'http://liveplus-static.oss-cn-beijing.aliyuncs.com/link/dev/h5/assets/fonts/SourceHanSansCN-Medium.otf',
      ),
      const WebFontsVariant(
        fontWeight: FontWeight.w700,
        fontStyle: FontStyle.normal,
      ): WebFontsFile(
        'http://liveplus-static.oss-cn-beijing.aliyuncs.com/link/dev/h5/assets/fonts/SourceHanSansCN-Heavy.otf',
      ),
    });
    _registered = true;
  }

  static TextStyle getTextStyle([TextStyle? textStyle]) {
    register();

    return WebFonts.getTextStyle(_fontFamily, textStyle: textStyle);
  }

  static TextTheme getTextTheme([TextTheme? textTheme]) {
    register();

    return WebFonts.getTextTheme(_fontFamily, textTheme);
  }
}