ios: Accessing a navigation controller from app delegate

Question

I have an app that receives push notifications. In didReceiveRemoteNotifications, I would like to make the app show a particular view controller in the app's navigation controller (which happens to be the root view controller). What is the best way to make this happen? Can I get a reference to the navigation controller in the app delegate?

EDIT: Here is the code I'm trying to use right now. It appears to use the correct navigation controller, but it doesn't display the view controller at all, just a blank screen:

        UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
        EventDetailViewController *destCon = [storyboard instantiateViewControllerWithIdentifier:@"EventDetailViewController"];
        destCon.event=notifyEvent;
        UINavigationController *navController =(UINavigationController *) self.window.rootViewController;
        [navController pushViewController:destCon animated:YES];

Here is what I'm seeing:

enter image description here

score 53 · Accepted Answer · edited Apr 25 '14 at 09:46

53

If your navigation controller is the root view controller of the window, then you can just use

(UINavigationController *)self.window.rootViewController

from the app delegate to access the one you created in the storyboard.

edited Apr 25 '14 at 09:46

HpTerm

8,151
12
51
67

answered Jan 02 '13 at 19:18

rdelmar

103,982
12
207
218

@JamesHarpe, Try logging self.window.rootViewController and see what it gives you. – rdelmar Jan 02 '13 at 19:38
2

how is this in swift? – SwingerDinger Dec 27 '14 at 14:20

SpaceDust__ · Answer 2 · 2013-01-02T19:20:54.793

I use something like below it works for me, try to modify for your usage

Stoaryboard is the name of your storyboard, when you recieve notification you can call your rootview LoginViewController

Make sure your viewcontroller in interface builder is set to yourControllerName in below example it is LoginView

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
{

        //replace and push rootview manually
        UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Storyboard" bundle:nil];
        LoginViewController *ivc = [storyboard instantiateViewControllerWithIdentifier:@"LoginView"];
        UINavigationController *navigationController=[[UINavigationController alloc] initWithRootViewController:ivc];
        self.window.rootViewController =nil;
        self.window.rootViewController = navigationController;
        [self.window makeKeyAndVisible];
}

This creates a new navigation controller. I want to use the existing navigation controller that is currently on the screen. That way the user can press the back button and return to where they were. — James Harpe, Jan 02 '13 at 19:17

ios: Accessing a navigation controller from app delegate

2 Answers2