Example of iOS -prepareForSegue:sender: in Objective-C and Swift

prepareForSegue:sender:_ObjCvsSwift

// Objective-C

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
  if ([segue.identifier isEqualToString:@"Item Detail"]) {
    DetailViewController *d = (DetailViewController *)segue.destinationViewController;
    d.title = segue.identifier;
    d.itemForDetail = item;
  } else if ([segue.identifier isEqualToString:@"Related Items"]) {
    UINavigationController *nc = segue.destinationViewController;
    RelatedViewController *r = (RelatedViewController *)nc.topViewController;
    r.title = segue.identifier;
    r.category = item.category;
  }
}

// Swift

override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) {
  switch (segue.identifier, segue.destinationViewController) {
  case let (i, d as DetailViewController) where i == "Item Detail":
    d.title = i
    d.itemForDetail = item
  case let (i, nc as UINavigationController) where i == "Related Items":
    let r = nc.topViewController as RelatedViewController
    r.title = i
    r.category = item.category
  default:
    break;
  }
}

In the above examples of both Obj-C and Swift, the "title" is from child View right?
I've tried the above code as it is, but it is not working. The label on the next view controller is not getting updated.
I'm stuck with this since last 2 days, please help.!!

Thanks in advance..