Fatal error: Unexpectedly found nil while unwrapping an Optional value

Question

Created Dec ’20

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Does anyone now how I can fix the error "Fatal error: Unexpectedly found nil while unwrapping an Optional value"?

(And maybe what that means).

Thank you so much!

Code Block  func updateUI() {
        var letters = [String]()
        for letter in currentGame.formattedWord {
            letters.append(String(letter))
        }
        let wordWithSpacing = letters.joined(separator: " " )
        
        correctWordLabel.text = currentGame.formattedWord
        scoreLabel.text = "Wins: \(totalWins), Losses: \(totalLosses)"
        treeImageView.image = UIImage(named: "Tree \(currentGame.incorrectMovesRemaining)")
    }

The error displays at the last line (19/20).

Answered by OOPer in 653980022

what that means

It means that something was nil where it should not be.

how I can fix the error

Check all the place you use Implicitly Unwrapped Optional type (!) and forced unwrapping (!).

In your code shown, there are no forced unwrappings, so you may have some properties with Implicitly Unwrapped Optional type.

I guess your treeImageView is declared as var treeImageView: UIImageView!, but it is not given a value.

If it is an @IBOutlet, check if it is properly connected in the storyboard.
One more, you need to check if you instantiated your view controller properly.

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Answer 1

Claude31 OP

Dec ’20

That means that you are trying to unwrap an optional value that is nil.

Are you sure you have connected treeImageView properly to its IBOutlet ?
How is treeImageView declared in code ?

To check, add a print on line 18

Code Block print("treeImage is", treeImage)
print(UIImage(named: "Tree \(currentGame.incorrectMovesRemaining)"))

And tell what you get.

1

Answer 2

OOPer OP

Dec ’20

Accepted Answer

what that means

It means that something was nil where it should not be.

how I can fix the error

Check all the place you use Implicitly Unwrapped Optional type (!) and forced unwrapping (!).

In your code shown, there are no forced unwrappings, so you may have some properties with Implicitly Unwrapped Optional type.

I guess your treeImageView is declared as var treeImageView: UIImageView!, but it is not given a value.

If it is an @IBOutlet, check if it is properly connected in the storyboard.
One more, you need to check if you instantiated your view controller properly.

1