Popover Presentation Delegate

ppc.m

// Set the popover presentation controller when prepare for segue
// The presentation style is set in the storyboard
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"SeguePopover"])
    {
        self.featuredPPC = segue.destinationViewController.popoverPresentationController;
        self.featuredPPC.delegate = self;
    }
}

// When adapting to a modal presentation embed the presented VC in a navigation controller if it
// does not already have one and add a button to dismiss
- (UIViewController *)presentationController:(nonnull UIPresentationController *)controller viewControllerForAdaptivePresentationStyle:(UIModalPresentationStyle)style {

    UINavigationController *navController = nil;
    
    if (style != UIModalPresentationNone) {
        if ([controller.presentedViewController isKindOfClass:[UINavigationController class]]) {
            navController = (UINavigationController *)controller.presentedViewController;
        } else {
            navController = [[UINavigationController alloc] initWithRootViewController:controller.presentedViewController];
        }
        
        UIViewController *rootViewController = navController.viewControllers[0];
        rootViewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]
                                                               initWithBarButtonSystemItem:UIBarButtonSystemItemDone
                                                               target:self
                                                               action:@selector(didDismissPresentedView)];
    }
    return navController;
}

// Remove the dismiss button if we are no longer modal
- (void)presentationController:(UIPresentationController *)presentationController willPresentWithAdaptiveStyle:(UIModalPresentationStyle)style transitionCoordinator:(nullable id <UIViewControllerTransitionCoordinator>)transitionCoordinator {

    if (style == UIModalPresentationNone) {
        if ([presentationController.presentedViewController isKindOfClass:[UINavigationController class]]) {
            UINavigationController *navController = (UINavigationController *)presentationController.presentedViewController;
            UIViewController *rootViewController = navController.viewControllers[0];
            rootViewController.navigationItem.leftBarButtonItem = nil;
        }        
    }
}

- (void)didDismissPresentedView
{
    [self.presentedViewController dismissViewControllerAnimated:YES completion:NULL];
}