UIPopoverControllerView root просмотр заполнения

Question

Как видно На изображении, когда root-вид поднимается до вершины стрелки. Верх кнопки обрезается.

Как это исправить?

- (IBAction)actionAddChatBtn:(id)sender {
    UIButton *view = (UIButton *)sender;

    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]];
    ChatTypePopupViewController *vc = [storyboard instantiateViewControllerWithIdentifier:@"choose_chattype_popup"];
    vc.chatTypePopupDelegate = self;

    [self presentPopOverWithViewController:vc sourceView:view];
}

- (void)presentPopOverWithViewController:(UIViewController *)viewController sourceView:(UIView *)sourceView {
    viewController.modalPresentationStyle = UIModalPresentationPopover;
    viewController.preferredContentSize = viewController.view.bounds.size; 

    UIPopoverPresentationController *presentationController = viewController.popoverPresentationController;
    presentationController.delegate = self;
    presentationController.permittedArrowDirections = UIPopoverArrowDirectionUp;
    presentationController.sourceView = sourceView;
    presentationController.sourceRect = sourceView.bounds;

    [self presentViewController:viewController animated:YES completion:NULL];
}