Perform Segue on ViewDidLoad

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I answered a similar question where the developer wanted to show a login screen at the start. I put together some sample code for him that can be downloaded here. The key to solving this problem is calling things at the right time if you want to display this new view controller, you will see in the example you have to use something like this

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];

    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
    UIViewController *vc = [storyboard instantiateViewControllerWithIdentifier:@"LoginViewController"];
    [vc setModalPresentationStyle:UIModalPresentationFullScreen];

    [self presentModalViewController:vc animated:YES];
}

I also have an explanation of how segues and storyboards work that you can see here

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