Set the title to be a space character before pushing your friend search view controller.
self.title = @" ";
[self.navigationController pushViewController:friendSearchViewControler
animated:YES];
And in -viewWillAppear:
set the title to the actual title!
-(void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
self.title = NSLocalizedString(@"UniGo!", nil);
}