Can you explain why this NavigationController setup works

Question

I'm trying to understand how to setup a NavigationController. I don't understand why this code works with both a pushViewController AND presentModalViewController. I thought it had to be one or the other.

For context, this is a UIViewController that creates a UIImagePickerController. There are two view controllers after, the first (EditPictureViewController) edits the image itself and the second edits the properties. Believe I should use presentModalViewController.

...also is there a way to not dismiss the Modal View Controller so I can have a retake picture button on the EditPictureViewController?

Thanks.

- (void)viewDidLoad {

    [super viewDidLoad];
    self.navController = [[UINavigationController alloc] init]; }

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

    [self dismissModalViewControllerAnimated:NO];
    EditPictureViewController *viewController = [[EditPictureViewController alloc] initWithImage:image];
    [viewController setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];
    [self.navController setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];
    [self.navController pushViewController:viewController animated:NO];
    [self presentModalViewController:self.navController animated:YES]; }

Answer 1

This pushes the EditPictureViewController onto the NavigationController's view stack.

[self.navController pushViewController:viewController animated:NO];

Then you present the NavigationController here:

[self presentModalViewController:self.navController animated:YES];

I mean, all you're doing is presenting a modal view from a view controller and that modal happens to be a NavigationController.