You are allocating an initialising your favouritesViewController, but you aren't associating a view with it - which is why you get the message that the view outlet wasn't set. To load the XIB file for your view you would use -
SFFavoritesViewController *favoritesViewController = [[SFFavoritesViewController alloc]initWithNibName:@"favouritesView" bundle:nil];
Make sure you have set the Custom Class for 'Files owner' to SFFavoritesViewController in IB
Also, it seems unusual to present a navigation controller modally - I would have thought you would have just presented the SFFavoritesViewController directly
[self presentViewController:favoritesViewController animated:YES completion:nil];