How to get viewcontroller in storyboard by identifier?

Question

I try to get a viewcontroller from storyboard like this:

    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    ViewController *vc = [storyboard instantiateViewControllerWithIdentifier:@"vc"];
    ViewController *avc = ((UINavigationController *)(_window.rootViewController)).topViewController;

But they are not the same object:

(lldb) po vc <ViewController: 0x17eaee50>
(lldb) po avc <ViewController: 0x17e72970>

Why?

Answer 1

They are of the same class, but different instances. instantiateViewControllerWithIdentifier instantiates a new view controller, as the name implies :).