Question

我试图很好地理解Flutter的生命周期，并且不确定按PUSH视图之类的事件发生两次是正常的。我正在搜索仅在显示视图时发生一次的事件。例如： ViewA显示eventImSearchingOn仅发生一次。 ViewA打开ViewB，ViewA被停用。 ViewB返回ViewA，并且eventImSearchingOn仅发生一次。

我尝试过的代码的日志：

InitState SplashScreenUI
ChangeDependencies SplashScreenUI
PUSH SplashScreenUI
InitState SplashScreenUI
ChangeDependencies SplashScreenUI
PUSH SplashScreenUI

主类

@override
  Widget build(BuildContext context) {
    return StoreProvider<AppState>(
      store: widget.store,
      child: MaterialApp(
        ...
        ....
        initialRoute: '/SplashScreen',
        home: SplashScreenUI(),
        navigatorKey: Keys.navKey,
        navigatorObservers: [Keys.routeObserver],
        routes: <String, WidgetBuilder>{
          '/Home': (BuildContext context) => HomePageUI(),
          '/Login': (BuildContext context) => LoginPageUI(),
          '/Routine': (BuildContext context) => RoutineUI(),
          '/Notifications': (BuildContext context) => NotificationsUI(),
          '/Chat': (BuildContext context) => ChatUI(),
          '/Profile': (BuildContext context) => ProfileUI(),
          '/ProfileForm': (BuildContext context) => ProfileFormUI(),
          '/Interview': (BuildContext context) => InterviewUI(),
          '/BodyCheck': (BuildContext context) => BodyCheckUI(),
          '/SplashScreen': (BuildContext context) => SplashScreenUI(),

SplashScreen类

class _SplashScreenUIState extends State<SplashScreenUI>  with RouteAware{

  _SplashScreenUIState();

  @override
  void initState() {
    print("InitState SplashScreenUI");
    super.initState();
    store.dispatch(CheckLogIn());
  }

  @override
  void didChangeDependencies() {
    print("ChangeDependencies SplashScreenUI");
    super.didChangeDependencies();
    Keys.routeObserver.subscribe(this, ModalRoute.of(context));
  }

  @override
  void deactivate() {
    print("Deactivate SplashScreenUI");
    super.deactivate();
  }

  @override
  void dispose() {
    print("Dispose SplashScreenUI");
    Keys.routeObserver.unsubscribe(this);
    super.dispose();
  }

  @override
  void didPush() {
    print("PUSH SplashScreenUI");    
  }

  @override
  void didPopNext() {
    print("POP SplashScreenUI");
  }

Answer 1

对不起，问题在那里：

initialRoute: '/SplashScreen',
home: SplashScreenUI(),

此双重声明导致SplashScreen被调用两次。更改为此，解决问题。

home: SplashScreenUI(),

在Flutter中两次两次发生PUSH事件是正常的吗？

1 个答案: