所有的问题都解决了.
将一个观察者放在导航器上,该观察者来自小部件树的根(MaterialAppwidget).
如果您需要更多说明,请点击此链接:
https://api.flutter.dev/flutter/widgets/RouteObserver-class.html个
我已经在我的项目中实现了,它在@Sp4Rx上运行得很好
// Register the RouteObserver as a navigation observer.
final RouteObserver<PageRoute> routeObserver = RouteObserver<PageRoute>();
void main() {
runApp(MaterialApp(
home: Container(),
navigatorObservers: [routeObserver],
));
}
class RouteAwareWidget extends StatefulWidget {
State<RouteAwareWidget> createState() => RouteAwareWidgetState();
}
// Implement RouteAware in a widget's state and subscribe it to
// the
// RouteObserver.
class RouteAwareWidgetState extends State<RouteAwareWidget> with RouteAware {
@override
void didChangeDependencies() {
super.didChangeDependencies();
routeObserver.subscribe(this, ModalRoute.of(context));
}
@override
void dispose() {
routeObserver.unsubscribe(this);
super.dispose();
}
@override
void didPush() {
// Route was pushed onto navigator and is now topmost route.
}
@override
void didPopNext() {
// Covering route was popped off the navigator.
}
@override
Widget build(BuildContext context) => Container();
}