Present a modal view controller always

gistfile1.m

- (void)presentViewControllerFromVisibleViewController:(UIViewController *)viewControllerToPresent
{
    if ([self isKindOfClass:[UINavigationController class]]) {
        UINavigationController *navController = (UINavigationController *)self;
        [navController.topViewController presentViewControllerFromVisibleViewController:viewControllerToPresent];
    } else if (self.presentedViewController) {
        [self.presentedViewController presentViewControllerFromVisibleViewController:viewControllerToPresent];
    } else {
        [self presentModalViewController:viewControllerToPresent animated:YES];
    }
}