didChangePrevious method
- @override
override
This route's previous route has changed to the given new route. This is
called on a route whenever the previous route changes for any reason, so
long as it is in the history. previousRoute will be null if there's no
previous route.
Implementation
@override
void didChangePrevious(Route<dynamic> previousRoute) {
final String previousTitleString = previousRoute is CupertinoPageRoute
? previousRoute.title
: null;
if (_previousTitle == null) {
_previousTitle = ValueNotifier<String>(previousTitleString);
} else {
_previousTitle.value = previousTitleString;
}
super.didChangePrevious(previousRoute);
}