특정 viewcontroller로 pop

방법1.

NSArray * vcStack = self.navigationController.viewControllers;
NSInteger index = vcStack.count - 1;
        
while (YES) {
  index--;
  UIViewController *vc = [vcStack objectAtIndex:index];
  if([vc isKindOfClass:[원하는VC class]]){
    [self.navigationController popToViewController:vc animated:YES];
    return;
  }
}

방법2.

let controllers = self.navigationController?.viewControllers
for vc in controllers! {
  if vc is AddFavoriteVC {
    self.navigationController?.popToViewController(vc as! AddFavoriteVC, animated: true)
  }
}