Swift PushViewController From A Different Storyboard

Question

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I'm trying to show one of my ViewControllers of a different storyboard programmatically. But for some reasons the properties of the ViewController I'm trying to show are nil.

That's my error: Unexpectedly found nil while unwrapping an Optional value

I'm getting the error in my SecondViewController. It is showing but my app crashes due to the properties being nil.

That's my code:

let secondStoryBoard = UIStoryboard(name: "SecondStoryBoard", bundle: nil)
let secondViewController = secondStoryBoard.instantiateViewController(withIdentifier: "secondVC") as! SecondVC


self.navigationController?.pushViewController(secondViewController, animated: true)

That's the code producing the error:

class SecondVC: ViewController
{
    @IBOutlet weak var mapView: MKMapView!
    mapView.isHidden = true // ERROR!! Unexpectedly found nil while unwrapping an Optional value
}

SOLVED: just had to reconnect my @IBOutlet connections

Answer 1

This means that the following line is either nil or not of type SecondVC.

secondStoryBoard.instantiateViewController(withIdentifier: "secondVC")

I would verify in your storyboard that you have an identifier secondVC and that view controller is of type SecondVC.

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Edit:

Based on the new code the OP posted in the question, changing the SecondVC to the following should work.

class SecondVC: ViewController
{
    @IBOutlet weak var mapView: MKMapView!

    override func viewDidLoad() {
        mapView.isHidden = true
    }
}

Basically this will wait until the view has loaded before accessing the mapView. For the original code, you were trying to access mapView before it has actually been loaded.

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Edit 2:

It looks like mapView outlet is not properly linked to the storyboard.