How can i get a NSManagedObjectContext without help of UIApllication delegate?

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I have a simple app that i'm building to consolidate my little knowledge about core data. My main problem is that my method for get the NSManagedObjectContext returns nil. The approach to get this is showed in one of the Stanford classes about core data. I'm doing something wrong, but i don't know what(My code looks identical with the one showed in class)... Of course, the results are a crash in my app, that complains about "+entityForName: nil is not a legal NSManagedObjectContext parameter searching for entity name...", when i try to save the data, but my context is nil.

The code to get the NSManagedObjectContext:

- (void)setupFile {

NSURL *URL = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentationDirectory
                                                     inDomains:NSUserDomainMask] lastObject];
URL = [URL URLByAppendingPathComponent:@"FlashCardCoreData"];
UIManagedDocument *document = [[UIManagedDocument alloc] initWithFileURL:URL];

if ([[NSFileManager defaultManager] fileExistsAtPath:[URL path]] == NO) {
    [document saveToURL:URL forSaveOperation:UIDocumentSaveForCreating completionHandler:^(BOOL success) {
        if (success) {
            self.sharedContext = document.managedObjectContext;
        }
    }];
} else if (document.documentState == UIDocumentStateClosed) {
    // open the document
    [document openWithCompletionHandler:^(BOOL success) {
        if (success) {
            self.sharedContext = document.managedObjectContext;
        }
    }];
} else {
    self.sharedContext = document.managedObjectContext;
}
}

This class is a singleton class for share a global context that i can use in all of the controllers and forms for displaying/saving the objects...

Note: I didn't used the global context shared in the app delegate because i did't choose my app for use the core data(hence it's not an available property in the delegate), and i don't know how can i change that once my app is already created.

Can anyone help me? Any suggest will be appreciated.

Thanks for the attention.

asked 2 mins ago

Tiago Maia

1