Summary of flutter

1. If you're running pod install manually, make sure flutter pub get is executed first"

cd To Engineering iOS The directory executes the following commands ：flutter packages get

2. Air safety operation ：

flutter run --no-sound-null-safety

3. establish Flutter Specify language when project ：

flutter create -i objc -a java

4.Tabbar

class MyApp extends StatelessWidget {
  MyApp({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false, // debug  Icon 
      home: Tabs(),
      theme: ThemeData(primarySwatch: Colors.lightBlue),
    );
  }
}

class _TabsState extends State<Tabs> {
  int _current = 0;
  List pageList = [Home(), Product(), Discover(), MinePage()];
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: this.pageList[this._current],
      bottomNavigationBar: BottomNavigationBar(
        iconSize: 40,
        currentIndex: this._current,
        type: BottomNavigationBarType.fixed,
        onTap: (value) {
          setState(() {
            this._current = value;
          });
        },
        items: [
          BottomNavigationBarItem(icon: Icon(Icons.home), label: ' home page '),
          BottomNavigationBarItem(icon: Icon(Icons.catching_pokemon), label: ' project '),
          BottomNavigationBarItem(icon: Icon(Icons.badge_sharp), label: ' Find out '),
          BottomNavigationBarItem(icon: Icon(Icons.settings), label: ' Set up '),
        ],
      ),
    );
  }
}

5 Navigation Navigation

    return Scaffold(
      appBar: AppBar(
        title: Text(' title '),
      ),
      body: Container(),
    );