Swift Cannot convert Int to String with usual methods

Question

The general purpose of converting an Int into a String is to display a "Score", which is incremented by one, every time a SKSpriteNode is tapped. The gesture is recognized by my GameScene class in GameScene.swift. It then uses a struct named "variables" to send the "Score" to my GameViewController which will display the score via UILabel. This is were I need to convert the Int into a String. Simple. Except every method I've tried has ended with the error: fatal error: unexpectedly found nil while unwrapping an Optional value. Furthermore, whenever I try to treat "Score" as an optional (add a '?') XCode gives me another error and tells me to remove it.

TL;DR: I need to convert an Int into a String, and all the methods that usually work aren't.

Method's I've tried:

scoreLabel.text = NSNumber(integer: Score).stringValue
scoreLabel.text = "\(Score)"
scoreLabel.text = String(Score)
scoreLabel.text = toString(Score)
scoreLabel.text = "\(Score.description)"
scoreLabel.text = Score.description
scoreLabel.text = "\(NSNumber(integer: Score).stringValue)"

I've also restarted XCode and Mac. Have I missed something obvious? Please help a noob out.

EDIT #1: I forgot to mention that I've been logging "Score" in both GameScene.swift and GameViewController.swift; both return the correct value.

first question: why not use an sklabelnode instead of uilabel? — Abdul Ahmad
– Abdul Ahmad, Commented Jul 7, 2015 at 3:40
What you have tried should work, so clearly your problem is not in the Int to String conversion. Try printing the value of your variables struct after every statement once it is created or modified, and print it's value just before being used. This will help you see what is going on tremendously. If I had to guess, I would say that you just aren't initializing variables properly. — Adam Evans
– Adam Evans, Commented Jul 7, 2015 at 3:40
@AbdulAhmad "I don't know what I don't know", I'll go look into it. Thanks! — JamMySon
– JamMySon, Commented Jul 7, 2015 at 3:43
@Aderis If you mean logging it before I transfer it, and after it's been received, then I have. — JamMySon
– JamMySon, Commented Jul 7, 2015 at 3:44

JustAnotherGuy · Accepted Answer · 2018-04-19 05:52:55Z

1

The error you are receiving isn't because of the proper code, its because your "Score" variable is nil. What I always use is ->

scoreLabel.text = "\(Score)"

Then, set your the value of your "Score" to 0 so its value can't be returned nil.

var Score : Int = 0

Finally, to display the score, you should use an SKLabelNode.

var scoreLabel = SKLabelNode(fontNamed: "American Typewriter")

Then, in your didMove(toView)

override func didMove(to view: SKView) {
    scoreLabel.text = "\(Score)"
    scoreLabel.fontColor = UIColor.green
    scoreLabel.fontSize = 30
    scoreLabel.position = CGPoint(x: 0, y: self.frame.height / 4)
    self.addChild(scoreLabel)
}

answered Apr 19, 2018 at 5:52

JustAnotherGuy

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JamMySon · Accepted Answer · 2015-07-07 04:02:44Z

1

As Abdul Ahmad suggested, I should use a SKLabelNode rather than a UILabel to display my score because I'm doing so from a subclass of SKScene. I don't know why the value couldn't be converted in my other class (as Aderis pointed out, all my methods should've worked), as I was able to log it using the same syntax and methods I was using to attempt to set the UILabel's text.

To any future googlers with the same problem:

Check your syntax
Log the value at every point it could change
Try to use similar classes? (I used a SKScene to change the text of a SKLabelNode rather than a UILabel)

answered Jul 7, 2015 at 4:02

JamMySon

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Long Pham · Accepted Answer · 2015-07-07 04:40:09Z

1

Problem is swift checking type. You declare an optional value and when you use it. You need force it not nil.

// declare optional variable
var score: Int?

// Use it when you sure not nil
yourLabel.text = String(score!)

I advice you need to set initial value.

var score: Int = 0

And use it.

yourLabel.text = String(score)

answered Jul 7, 2015 at 4:40

Long Pham

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1 Comment

JamMySon Over a year ago

Thanks for the advice! Although I did init score four different ways per method (see question) including: var score: Int?, var score: Int!, var score: Int = 0, and var score = 0. Probably should've mentioned this in the question.

philippe · Accepted Answer · 2016-05-25 12:24:06Z

0

Try this :

    let cast_this_optional_integer = Int(Score!)
    print(String(cast_this_optional_integer))

answered May 25, 2016 at 12:24

philippe

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