营销网站创建,经典seo伪原创,百度做网站 推广费用怎么收,wordpress后台打开太慢flutter字体大小切换案例 小字体#xff0c;标准字体#xff0c;大字体#xff0c;超大字体案例
Android iOS设备带有选择记录
我的flutter项目版本 environment: sdk: ‘3.4.4 4.0.0’
图片案例 pubspec.yaml 添加依赖 # 屏幕尺寸适配 https://github.com/OpenF…flutter字体大小切换案例 小字体标准字体大字体超大字体案例
Android iOS设备带有选择记录
我的flutter项目版本 environment: sdk: ‘3.4.4 4.0.0’
图片案例 pubspec.yaml 添加依赖 # 屏幕尺寸适配 https://github.com/OpenFlutter/flutter_screenutilflutter_screenutil: ^5.9.3# 状态管理 https://github.com/rrousselGit/providerprovider: ^6.1.2# 本地存储 官方插件 https://github.com/flutter/pluginsshared_preferences: ^2.2.3代码案例
import package:flutter/material.dart;
import package:flutter_screenutil/flutter_screenutil.dart;
import package:shared_preferences/shared_preferences.dart;
import package:provider/provider.dart;void main() async {await ScreenUtil.ensureScreenSize(); // 确保屏幕大小被正确设置runApp(MyApp());
}class MyApp extends StatelessWidget {overrideWidget build(BuildContext context) {return ScreenUtilInit(designSize: const Size(360, 690), // 设计稿尺寸builder: (_, child) MaterialApp(home: ChangeNotifierProvider(create: (context) FontSizeProvider(),child: HomeScreen(),),),);}
}class FontSizeProvider with ChangeNotifier {double _fontSize 1.0; // 默认字体大小double get fontSize _fontSize;Futurevoid loadFontSize() async {final prefs await SharedPreferences.getInstance();_fontSize prefs.getDouble(fontSize) ?? 1.0;notifyListeners();}Futurevoid saveFontSize(double size) async {final prefs await SharedPreferences.getInstance();await prefs.setDouble(fontSize, size);_fontSize size;notifyListeners();}
}class HomeScreen extends StatelessWidget {overrideWidget build(BuildContext context) {//var fontSizeProvider Provider.ofFontSizeProvider(context, listen: false);var fontSizeProvider Provider.ofFontSizeProvider(context);fontSizeProvider.loadFontSize(); // 加载字体大小设置return Scaffold(appBar: AppBar(title: Text(字体大小切换,style: TextStyle(fontSize:15.sp * fontSizeProvider.fontSize, // 根据fontSizeProvider调整字体大小),),),body: Center(child: Column(mainAxisAlignment: MainAxisAlignment.center,children: Widget[Text(这是一段示例文本,style: TextStyle(fontSize: 15.sp *fontSizeProvider.fontSize, // 根据fontSizeProvider调整字体大小),),ElevatedButton(onPressed: () fontSizeProvider.saveFontSize(0.8), // 小字体child: Text(小字体),),ElevatedButton(onPressed: () fontSizeProvider.saveFontSize(1.0), // 标准字体child: Text(标准字体),),ElevatedButton(onPressed: () fontSizeProvider.saveFontSize(1.2), // 大字体child: Text(大字体),),ElevatedButton(onPressed: () fontSizeProvider.saveFontSize(1.5), // 超大字体child: Text(超大字体),),],),),);}
}
