Get object reference of UIViewController using rootViewController from AppDelegate

Asked Feb 25 '19 at 11:26

Active Feb 25 '19 at 11:51

Viewed 26 times

I need to access an object that it's present in many UIViewControllers from AppDelegate class. I want to update the top bar icon when a notification is received. What I have done so far:

UIViewController *vc = self.window.rootViewController;

If I had only one UIViewController then I would just cast the vc to my UIViewController and get the object. But the problem is that I have many UIViewControllers and I don't know which one will be active when I need it.

The object inside the UIViewControllers that I need it's called topBarManager. How can I access that object from AppDelegate? Thanks

EDIT: One way to solve this is by using isKindOfClass but I need to write all the cases for all the UIViewControllers.

edited Feb 25 '19 at 11:51

asked Feb 25 '19 at 11:26

Student

Why does the AppDelegate need to get involved? Can't you arrange for notifications or something so the correct view controller can do this work autonomously? – trojanfoe Feb 25 '19 at 11:29
No, it has to be inside AppDelegate. – Student Feb 25 '19 at 11:30
Nah, that smells wrong. Anyway good luck! – trojanfoe Feb 25 '19 at 11:31

Get object reference of UIViewController using rootViewController from AppDelegate

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