다른 ViewController 띄우기

AppDelegate나 ViewController에서 임의의 ViewController을 띄우고 싶을 때 참고.

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Storyboard" bundle:nil];

LoginViewController *myViewController = [storyboard instantiateViewControllerWithIdentifier:@"myViewController"];

[self.window makeKeyAndVisible];

[self.window.rootViewController presentViewController:myViewController animated:YES completion:NULL];