didChangeAppLifecycleState property Null safety

(void Function?(BuildContext context, AppLifecycleState state)?) didChangeAppLifecycleState
final
StateWithMixinBuilder(
 didChangeAppLifecycleState:(BuildContext context,  AppLifecycleState state)=> myModel.myMethod([context, state]),
 MixinWith : MixinWith.widgetsBindingObserver
 builder:(BuildContext context, Injected model) =>MyWidget(),
)

Called when the system puts the app in the background or returns the app to the foreground.

The third parameter depends on the mixin used. It is a TickerProvider for tickerProviderStateMixin

Implementation

final void Function(BuildContext context, AppLifecycleState state)?
    didChangeAppLifecycleState;