造成原因：苹果手机用户把字体设置成小号字体

关键代码

MediaQuery.of(context).copyWith(textScaleFactor: 1.0, boldText: false)

 return MaterialApp(
     
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        brightness: Brightness.light,
        primaryColorBrightness:Brightness.light,
        textTheme: TextTheme(display1: TextStyle(fontSize: 30)),
        fontFamily: "PingFang SC",
        primaryColor: Color(0xfff9f9f9),
      ),
//      home: LoginInfoController(),
      home: SplashPage(),
      //加上下面这段代码
      builder: (BuildContext context, Widget child) {
        return MediaQuery(
          data: MediaQuery.of(context).copyWith(textScaleFactor: 1.0, boldText: false),
          child: child
        );
      },
    );