CODEWITHSUNDEEP
flutterdart
Scaraux
Scaraux

Reputation: 4172

Flutter detect when Navigator is ready

Working on a Flutter app, I am handling deeplinks with a SDK for which I am given a listener that I must handle as soon as the app starts, therefore in the main().

Once a deeplink is received, I must navigate to the proper screen, based on the parameters passed along the deeplink data.

Since I receive the deeplink in the main function, I am detached from the Context of the app, therefore to access the NavigatorState I used a navigation singleton with a GlobalKey passed to my CupertinoApp's navigatorKey. I later use this key to retrieve the NavigatorState and call push. (instead of Navigator.of(context)....

However, if opening the app from a deeplink, it is very likely that the navigatorKey does not contain anything (yet).

How can I detect/wait until the Navigator is ready ?

As of right now my approach is to add a WidgetsBinding.instance.addPostFrameCallback in my App's initState, that resolves a promise to indicate when the GlobalKey pointing to the NavigatorState can be used... I'm sure there is a beter way to achieve this.

Upvotes: 1

Views: 991

Answers (1)

RegularGuy
RegularGuy

Reputation: 3686

For this i make the initialRoute as a Loading screen and execute all my logic inside it , that way i can have different initialRoutes and i don't have to worry about not having MediaQuery, or Navigator, or even ThemeData.

However the question specifies a way to know if the navigator is available, for this i would use the builder function of MaterialApp/WidgetsApp/CupertinoApp, it's used to override the navigator altought i use it to add pading and a global background color and even override the navigator widget with a custom one,

CupertinoApp(
  ...
builder: (context, child){
  //The navigator is ready
 Future.delayed(Duration.zero,
            () => print(navigatorKey.currentContext)); //We use a delayed since the child needs to be returned first. It's kinda like a hack 7u7 
  return child;
  }

Upvotes: 1

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