Question

我正在开发一个巨大的应用程序，当我在模拟器或真实设备上运行它时，它可以完美地在android上运行，今天它可以正常运行而没有任何错误，我尝试在iOS设备和模拟器上运行它，并且不断收到奇怪的错误，而无法跟踪到错误的位置。

以调试模式在iPhoneXʀ上启动lib / main.dart ... 错误完成：NoSuchMethodError：在null上调用了getter'length'。接收者：null 尝试致电：长度

main.dart文件：

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return  MaterialApp(

  title: 'Flutter Demo',
  theme: ThemeData(

    primarySwatch: Colors.blue,
  ),

  home: home_main(),
  routes: {
    // When navigating to the "/" route, build the FirstScreen     widget.
    // When navigating to the "/second" route, build the SecondScreen     widget.
    '/home_screen': (context) => home_screen(),
    '/register': (context) => register(),

    '/tyres':(context)=> tyres(),
    '/walk_through':(context)=> WalkthroughScreen(),
    '/use_my_location':(context)=> UseMyLocation(),
    '/home_main': (context) => home_main(),
    '/main_screen':(context)=> main_screen(),
    '/washing':(context) => maintenance(),
    '/profile':(context) => profile(),
    '/notifications':(context) => notifications(),
    '/cars':(context) => cars(),
    '/orders':(context) => orders(),
    '/aboutus':(context) => about_us(),
    '/testing':(context) => CustomRadio()
  },

);
}
}

Flutter NoSuchMethodError：仅在iOS上在null上调用了getter'length'

0 个答案: