遍历父控制的子控制器找导航控制器
for (UIViewController *controller in [(UIViewController *)self.nextResponder childViewControllers]) {
if ([controller isKindOfClass:[UINavigationController class]]) {
UINavigationController *navigation = (UINavigationController *)controller;
[self dismissViewControllerAnimated:YES completion:^{
}];
[navigation pushViewController:aritificial animated:YES];
}
}