set navigationController's rootViewController as delegate - objective-c

Question

My problem may be one of technique instead of a misunderstanding of how controllers and delegates are set up. That is, maybe I should be doing all a different way...
In any event, I have a storyboard setup with a mainViewController. In it there's a UIButton which, when clicked, segues to a popover. The popover's content view controller is a UINavigationController who's rootViewController is, say, MyViewController.
I'm trying to make the mainViewController a delegate of MyViewController and am doing so in prepareForSegue:
- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:(#"popSleepSegue")] || [segue.identifier isEqualToString:(#"popAlarmSegue")])
{
UIStoryboardPopoverSegue *popSegue = (UIStoryboardPopoverSegue *)segue;
popSegue.popoverController.delegate = self;
popSegue.popoverController.passthroughViews = [NSArray arrayWithObject:self.view];
if ([segue.identifier isEqualToString:#"popAlarmSegue"])
{
if ([[segue destinationViewController] isKindOfClass:[UINavigationController class]])
{
UINavigationController *uNC = (UINavigationController *)[segue destinationViewController];
MyViewController *aVC = (MyViewController *)uNC.topViewController;
aVC.popController = popSegue.popoverController;
aVC.delegate = self;
}
}
}
}
The [self.delegate class] is coming up as null in an NSLog when MyViewController loads. And, naturally, the delegate callback isn't received in the mainViewController.
Essentially, I'm trying to mimic the behavior of Apple's Calendar app on the iPad.
I'm trying to use delegation to pass data upstream as per the idiom. The trick is that I'm trying to set the delegate through a UINavigationController which is the content view of a popover. Sounds too complex. Maybe there's another idiom?
In the meantime, I'm going to give NSNotificationCenter a whirl.

Answer 1

You have to potential 'if' statements which can not be true:
if ([segue.identifier isEqualToString:#"popAlarmSegue"])
{
if ([[segue destinationViewController] isKindOfClass:[UINavigationController class]])
{
From the look of your code, you should get the controller drilling inside the content controller in the PopOver,not the destination viewController from the segue. As it seems the second 'if' is not true.
You would need to add:
if ([[popSegue.popoverController contentViewController] isKindOfClass:[UINavigationController class]])
{
UINavigationController *uNC = (UINavigationController *)popSegue.popoverController;
MyViewController *aVC = (MyViewController *)uNC.topViewController;
aVC.popController = popSegue.popoverController;
aVC.delegate = self;
}