passing data/objects/moc between viewcontrollers - best practice

Question

I have a scenario that i suspect is very common, i\'ve found various ideas in responses to other similar questions including setting up IBOutlets, passing NSmanagedobjects a

Answer 1

I would use notifications for this. Notifications are a simple way to decouple parts of the application, but still have them work together.

In your case, the moment the user selects the tag object in the 3rd view, I would send a notification as such:

[[NSNotificationCenter defaultCenter] postNotificationName:@"tagSelected" object:myTag];

Now, in the controller that has the "add" button, make it subscribe to that event:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleTagSelected:) name:@"tagSelected" object:nil];

Make sure you implement the handleTagSelected: method, and in that method you can get the tag object and close the drilldown view that you have open:

- (void)handleTagSelected:(NSNotification *)notification {
    Tag *mytag = (Tag *)notification.object;
    [self dismissModalViewControllerAnimated:YES];
}

Then you can do whatever you want with the tag.