问题描述
if(state1.status==ok&&state2.status==ok) {do something}
MultiBlocListener在这里不适用，因为我只能分别监听状态，我尝试嵌套BlocListener，但它并没有帮助我，因为外部BlocListener不会通知内部状态更改。所以在内部，只有在内部状态改变的那一刻，我才能检查外部的状态。
目前，我通过使用嵌套的BlocBuilder和WidgetsBinding.instance.addPostFrameCallback解决了这个问题。在这种情况下，外部BlocBuilder会重建内部class SplashScreen extends StatefulWidget {
static const routeName = 'splash';
static const logoUrl = 'assets/images/logo.svg';
const SplashScreen({Key key}) : super(key: key);
@override
_SplashScreenState createState() => _SplashScreenState();
}
class _SplashScreenState extends State<SplashScreen> {
@override
Widget build(BuildContext context) {
void _navigateto(String routeName) => Navigator.of(context).pushReplacementNamed(routeName);
return Scaffold(
backgroundColor: Theme.of(context).backgroundColor,body: BlocBuilder<SettingsBloc,Settingsstate>(
builder: (context,settingsstate) {
return BlocBuilder<AuthenticationBloc,AuthenticationState>(
builder: (context,authenticationState) {
WidgetsBinding.instance.addPostFrameCallback((_) {
if (authenticationState.status == AuthenticationStatus.UNAUTHENTICATED) {
Timer(Duration(seconds: 1),() => _navigateto(LoginScreen.routeName));
} else if (authenticationState.status == AuthenticationStatus.AUTHENTICATED) {
switch (settingsstate.currentType) {
case FastAccesstype.UNKNowN:
break;
case FastAccesstype.NONE:
Timer(Duration(seconds: 1),() => _navigateto(HomeScreen.routeName));
break;
case FastAccesstype.PIN:
Timer(Duration(seconds: 1),() => _navigateto(PinCodeScreen.routeNameLogin));
break;
case FastAccesstype.BIOMETRICS:
Timer(Duration(seconds: 1),() => _navigateto(BiometricsScreen.routeName));
break;
}
}
});
return Container(
decoration: Boxdecoration(gradient: mainGradient),child: Center(
child: WebsafeSvg.asset(SplashScreen.logoUrl),),);
},);
},);
}
}
，我可以检查多个状态更改是否正确。但我不确定通常是否可以通过这种方式解决此问题。
注意：状态1来自bloc1，状态2来自bloc2，换句话说，来自多个集团的多个状态
这是我现在使用的代码：
{{1}}
当我在设备导航测试中看到两次调用该动画时，它看起来并不干净。
解决方法
尝试条件
BlocBuilder<BlocT,YourState>(
bloc: bloc,condition: (c,s) => (s is ValidationState ),