SpriteKit Swift 4 Error: Type 'Int' has no member 'random'

Question

I am making a jumping game using Swift 4 and I am running into an error with the following code:

func addRandomForegroundOverlay() {
    let overlaySprite: SKSpriteNode!
    let platformPercentage = 60
    if Int.random(min: 1, max: 100) <= platformPercentage {
        overlaySprite = platform5Across
    } else {
        overlaySprite = coinArrow
    }
    createForegroundOverlay(overlaySprite, flipX: false)
}

The error comes on line 4 and says: Type Int has no member random.

check this https://stackoverflow.com/questions/34712453/random-number-x-amount-till-x-amount-swift/34712601#34712601 — Leo Dabus, Nov 11 '17 at 03:12
based on that link, it seems as though I need to use extensions? — , Nov 11 '17 at 03:47
you just need to add a new Swift file into your project and add those extensions there — Leo Dabus, Nov 11 '17 at 03:48
Thanks, Leo Dabus. It actually worked without needing the extensions. — , Nov 11 '17 at 04:20
I know that. It was just an alternative syntax. `Int(arc4random_uniform(100))+1` is enough for what you need — Leo Dabus, Nov 11 '17 at 04:21

Paulo Mattos · Answer 1 · 2017-11-11T03:08:56.940

1

The Int type doesn't provide a random() method.

Since you are making a game, using GameplayKit.GKRandom might be a good fit. Try this instead:

import GameplayKit
...
let randomizer = GKRandomSource.sharedRandom()
let randomInt = 1 + randomizer.nextInt(upperBound: 100) // 1...100

Or, better yet, implement the missing method yourself ;)

extension Int {
    static func random(min: Int, max: Int) -> Int {
        precondition(min <= max)
        let randomizer = GKRandomSource.sharedRandom()
        return min + randomizer.nextInt(upperBound: max - min + 1)
    }
}

usage:

let randomInt = Int.random(min: 1, max: 100)

edited Nov 11 '17 at 03:08

answered Nov 11 '17 at 02:37

Paulo Mattos

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How do I do this using SpriteKit? – Nov 11 '17 at 03:08
Pretty easy: add `import GameplayKit` at the top of your file; and then add my `extension Int { ...` outside any classes in this same file. – Paulo Mattos Nov 11 '17 at 03:10
...and you may also need to include the `GameplayKit` framework in your Xcode project, if you haven't done it already. – Paulo Mattos Nov 11 '17 at 03:49

score 1 · Answer 2 · answered Nov 11 '17 at 02:42

1

Simplest way would be to use Int(arc4random_uniform(100))

answered Nov 11 '17 at 02:42

Evan

750
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1

this would return a number from 0 to 99. not from 1...100. `Int(arc4random_uniform(100))+1` – Leo Dabus Nov 11 '17 at 03:09
Leo Dabus ... Does your answer include only numbers 1 through 100? – Nov 11 '17 at 03:12

SpriteKit Swift 4 Error: Type 'Int' has no member 'random'

2 Answers2