从AppDelegate导航iOS Storyboard ViewControllers

Question

I'm new to iOS development. I have a facebook login app which invokes delegate method in the appdelegate. I did this using .xib views but I need to do it on the storyboard. I have the LoginViewController which has a login button and once user click on it shows FB login and after user logged in it invokes appdelegate method from there I need to navigate to MainViewController. I have tried few ways to do this but its not working. Below is the code that I have tried last. But it's not working or not even give error. Please help me :(((

SCAppDelegate* appDelegate = (SCAppDelegate *)[[UIApplication sharedApplication] delegate];
LoginViewController *mvc = (LoginViewController *)appDelegate.window.rootViewController;
MainViewController *lvc2 = [mvc.storyboard instantiateViewControllerWithIdentifier:@"MainViewController"];
[_navController presentModalViewController:lvc2 animated:YES];

Answer 1

try this one..

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle: nil]; 
MainViewController *lvc = [storyboard   instantiateViewControllerWithIdentifier:@"StoryBoard ID of MainViewController"];
 [(UINavigationController *)self.window.rootViewController pushViewController:lvc animated:NO];