I'm sure "textFiled.text!" contains a value. Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value

Question

import UIKit

class FirstViewController: UIViewController {

    @IBOutlet weak var textFiled: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()

    }

    @IBAction func pressDoneButton(_ sender: UIBarButtonItem) {
        performSegue(withIdentifier: "showSecondVC", sender: self)
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "showSecondVC" {
            let secondVC = segue.destination as! SecondViewController
            secondVC.textLabel.text = textFiled.text!
        }
    }

}

The error is : thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value

But I'm sure textFiled.text! contains a value.

Why the error comes?

Don't assign text directly to another view controller. use `viewWillAppear` method of other class for that. and just pass the data to another view controller via object. — Dharmesh Kheni, Feb 22 '19 at 05:49
Check that textFiled (sic) is connected as an outlet correctly. — Chris Shaw, Feb 22 '19 at 05:49
secondVC.textLabel.text is UILabel in the SecondViewController. I can pass data to a String to the SecondViewController. i.e. textInSecondView can revive the textFiled.text!. But when I type 'secondVC.textLabel.text = textFiled.text!" the error comes again. — Stoneegg Teng, Feb 22 '19 at 05:53
It won't work with `'secondVC.textLabel.text = textFiled.text!` — Dharmesh Kheni, Feb 22 '19 at 05:54
pass it like `secondVC.yourString = textFiled.text!` and in `SecondViewController` declare `var yourString: String?` and in `SecondViewController` in `viewWillAppear` set `textLabel.text = yourString` — Dharmesh Kheni, Feb 22 '19 at 06:02
When reviewing the duplicate, be sure to see this answer: https://stackoverflow.com/a/49818897/1226963 — rmaddy, Feb 22 '19 at 06:30

score 0 · Accepted Answer · answered Feb 22 '19 at 06:22

You are trying to do,

secondVC.textLabel.text = textFiled.text!

You are right about textFiled.text! does have value and it is not nil here. But secondVC.textLabel is nil because secondVC is not loaded yet and all the outlets of a view-controller will be nil before it loads.

You should pass textFiled.text! to some variable and assign this to text-field in viewDidLoad method of SecondViewController.

I'm sure "textFiled.text!" contains a value. Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value

1 Answers1