Sending the managedObjectContext to viewController crashes

Question

I am trying to send my managedObjectContext from my masterViewController to anotherController via a segue and I am always getting this error:

-[UINavigationController setManagedObjectContext:]: unrecognized selector sent to instance 0x8d67c70
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UINavigationController setManagedObjectContext:]: unrecognized selector sent to instance 0x8d67c70'

I am getting the managedObjectContext from my appDelegate in the viewDidLoad() of the masterViewController like this:

AppDelegate *appDelegate = [UIApplication sharedApplication].delegate;
self.managedObjectContext = appDelegate.managedObjectContext;

I cant possibly think of anything I could have done wrong anymore, please help.

show your declaration part of managedObjectContext in masterViewController — manujmv, Dec 18 '13 at 08:42
It is declared like this: `@property (strong, nonatomic) NSManagedObjectContext *managedObjectContext;` I have also tried the retain option but still nothing. — kalafun, Dec 18 '13 at 08:45
Is MasterViewController have base of UINavigationController? Is property managedObjectContext fill in anyother place? — Mani, Dec 18 '13 at 08:57
Why are you setting the property on the navigation controller? — Duncan Groenewald, Dec 18 '13 at 08:58

score 2 · Accepted Answer · answered Dec 18 '13 at 08:58

I'm guessing that the view controller with the managedObjectContext property is embedded in a navigation controller. In the segue method, make sure you grab a reference to the correct view controller:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"MySegue"]) {

        UINavigationController *navController = (UINavigationController *)segue.destinationViewController;
        MyViewController *vc = (MyViewController *)navController.topViewController;

        AppDelegate *appDelegate = [UIApplication sharedApplication].delegate;
        vc.managedObjectContext = appDelegate.managedObjectContext;
    }
}

Thanks a lot, that did it, I totally forgot that I have a navigationController before the otherController. — kalafun, Dec 18 '13 at 10:19

score 0 · Answer 2 · answered Dec 18 '13 at 08:44

0

you call a setter method on UINAvigationController which only exists if you created a property managedObjectContext. So you would have to subclass the UINavigationConroller, create the property and then you should be able to set it from another class.

answered Dec 18 '13 at 08:44

thorb65

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Sending the managedObjectContext to viewController crashes

2 Answers2