iOS, PopOverPresentationController issue, .xib - ios

Question

I have a NavigationController, another controller was pushed on its stack: BNRDetailsViewController. Now, inside BNRDetailsViewController I am trying to show a popover window when pressing on a toolbar button, that would present me with UIImagePickerController (only on iPad devices). So, I tried to follow the following stackoverflow thread:
UIPopoverPresentationController on iOS 8 iPhone
But no success. If I just use their code I get an error that says, that pushing navigationController is not supported. If I try to push the newly created UIPopoverPresentationController like this: [self.navigationController pushViewController:self.imagePickerPopover animated:YES]; it crashes because UIPopoverPresentationController is not of type UIViewController, so, I guess, I can not just push it on the stack.
What would you suggest to do in this particular case?
Here is the code which I have right now that is triggered when the toolbar button is pressed:
- (IBAction)takePicture:(id)sender {
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
// If the device have camera, take a picture, otherwise,
// just pick from photo library
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
} else {
imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
}
imagePicker.delegate = self;
// Place image picker on the screen
//[self presentViewController:imagePicker animated:YES completion:NULL];
// Place image picker on the screen
// Check for iPad device before instantiating the popover controller
if ([UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPad) {
// Create a new popover controller that will display the imagePicker
_imagePickerPopover = [[UIPopoverPresentationController alloc] initWithPresentedViewController:imagePicker presentingViewController:self];
imagePicker.preferredContentSize = CGSizeMake(280, 200);
_imagePickerPopover.delegate = self;
_imagePickerPopover.sourceView = self.view;
CGRect frame = [[sender valueForKey:#"view"] frame];
frame.origin.y = frame.origin.y + 20;
_imagePickerPopover.sourceRect = frame;
// [self.navigationController pushViewController:self.imagePickerPopover animated:YES];
}
}

Answer 1

Here is the code, based on your code, that will get the popover to display on the iPad.
if ([UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPad) {
imagePicker.modalPresentationStyle = UIModalPresentationPopover;
imagePicker.preferredContentSize = CGSizeMake(280, 200);
CGRect frame = [[sender valueForKey:#"view"] frame];
frame.origin.y = frame.origin.y + 20;
UIPopoverPresentationController *popoverController =
imagePicker.popoverPresentationController;
popoverController.sourceView = self.view;
popoverController.sourceRect = frame;
[self.navigationController presentViewController:imagePicker
animated:YES completion:nil];
}