Move to another viewcontroller from button action of a custom tableviewcell

Question

I have a button inside a custom tableview cell in a tableview. I tried presenting, pushing and instantiating to another view controller but failed by showing error:

Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional

Here s my code: console image if required

class ProfileHeaderView: UITableViewCell{

    @IBAction func editProfile(_ sender: Any) {

        let editProfilePage = EditProfileViewController()
        UIApplication.shared.keyWindow?.rootViewController?.present(editProfilePage, animated: true, completion: nil)

    } 

}

The page which i wanted to move:

class EditProfileViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
    override func viewDidLoad() {
        super.viewDidLoad()

        self.hideKeyboardWhenTappedAround()

        mobileNumber.keyboardType = UIKeyboardType.numberPad **//Error**
    }
}

I tried presenting by rootViewController also. Please help.

Screenshot if required

Updated console after the story board identifier change

Answer 1

I solved this problem for myself with the following code You can use a protocol to delegate the click inside the tableviewcell back to the UIViewController In my case I did use segues but you can instantiate your EditProfileViewController directly inside the cellCallback function

Code for the delegate

protocol CellDelegator {
    func cellCallback(myData dataobject: Item)
}

Code inside the tableview cell

@IBAction func imageClicked(_ sender: UIButton) {
    self.delegate?.cellCallback(myData: (self.cartItem?.item)!)

}

Code inside the ViewController

extension MyViewController :  CellDelegator{
    func cellCallback(myData dataobject: Item) {
        performSegue(withIdentifier: "xyz", sender: dataobject)
    }

Answer 2

EXPLANATION

The crash is caused by line mobileNumber.keyboardType = UIKeyboardType.numberPad not because of UIKeyboardType.numberPad, but rather because of left hand side: mobileNumber.keyboardType. Mobile number is supposed to be an @IBOutlet of type UITextField! (implicitly forced unwrapped UITextField), which causes a crash when mobileNumber is nil. And that is your case.

It was working before, because before you were using a segue to navigate to EditProfileViewController and so storyboards initialized mobileNumber field properly before viewDidLoad was called. However, you are creating an instance of EditProfileViewController programmatically on this line: let editProfilePage = EditProfileViewController(), which totally circumvents storyboards. Therefore fields and actions that should be wired up by storyboards will not get wired up, resulting in your crash.

SOLUTION

Instead of calling an initializer, use storyboards to create an instance of EditProfileViewController. That means, replace this line:

let editProfilePage = EditProfileViewController()

With something like this:

let editProfilePage = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "EditProfileViewController") as! EditProfileViewController

In this line I assume that the storyboard with EditProfileViewController is named Main (of course, if the EditProfileViewController is defined in other storyboard, use that and not the Main storyboard there), plus make sure that you use Storyboard ID in your storyboard and it is set to EditProfileViewController (or use any custom id you want):