int buttonTagNumber = 2;
UIButton *myTaggedButton = (UIButton *)[self.view viewWithTag:buttonTagNumber];

UIStoryboard *sb = [UIStoryboard storyboardWithName:@"myStoryboard" bundle:nil];
UIViewController *vc = [sb instantiateViewControllerWithIdentifier:@"myViewController"];
    UIView *view = [vc.view viewWithTag:1];