CODEWITHSUNDEEP
iosswiftxcodedelegates
Max
Max

Reputation: 679

Pass several values between view controllers with delegates

I've succesfully managed to pass one piece of data (one String variable, one Int variable etc.) between view controllers with delegate functions. However, I haven't managed to pass various pieces of data through delegate functions.

I get the following error: 

*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIViewController 0x7faea770db60> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key receivingAmountLabel.'

If I delete the receingAmountLabel, the error goes to another UI element. If I remove that element, it continues to another.

All UI elements are connected as they should be. The relevant piece of code look like this:

FirstVC.swift class FirstVC: UIViewController, DataSentDelegateMax {

@IBOutlet weak var receivingStringLabel: UILabel!
@IBOutlet weak var receivingAmountLabel: UILabel!

func userDidEnterData(stringData: String, amountData: Int) {
    receivingStringLabel.text = stringData
    receivingAmountLabel.text = String(amountData)
}


override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if (segue.identifier == "showSecondVC") {
        let secondVC = segue.destination as! SecondVC
        secondVC.delegate = self
    }
}

SecondVC.swift

protocol DataSentDelegateMax {
    func userDidEnterData(stringData: String, amountData: Int)
}

    @IBOutlet weak var stringTF: UITextField!
    @IBOutlet weak var amountTF: UITextField!

    var delegate: DataSentDelegateMax? = nil

    @IBAction func sendButtonAction(_ sender: Any) {
        if delegate != nil {
            if (stringTF.text != nil) {
                if (Int(amountTF.text!) != nil) {
                    let stringData = stringTF.text
                    let amountData = Int(amountTF.text!)
                    delegate?.userDidEnterData(stringData: stringData!, amountData: amountData!)
                    dismiss(animated: true, completion: nil)
                }
            }
        }
    }

I get the same problem when trying to pass a dictionary in the delegate.

Upvotes: 0

Views: 72

Answers (2)

Monika mitruka
Monika mitruka

Reputation: 96

make sure receivingAmountLabel outlet is connected to FirstVC

Upvotes: 0

Vinit Ingale
Vinit Ingale

Reputation: 401

Use below simplified code: 

   if let del = delegate, let stringData = stringTF.text, let amountData = amountTF.text  {
        del.userDidEnterData(stringData: stringData, amountData: amountData)
        dismiss(animated: true, completion: nil)
    }

Upvotes: 1

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