Coding SpriteKit game and I am receiving "Instance member 'minX' cannot be used on type 'CGRect"

Question

I am having trouble fixing this error message down by the CGRect.minX/Y and CGRect.MaxX/Y. "Instance member 'minX' cannot be used on type 'CGRect" is the error. What could I do to fix it?

func spawnNewDisc(){

    var randomImageNumber = arc4random()%4
    randomImageNumber += 1

    let CheeseBlock = SKSpriteNode(imageNamed: "CheeseBlock\(randomImageNumber)")
    CheeseBlock.zPosition = 2
    CheeseBlock.name = "CheeseObject"

    let randomX = random(min: CGRect.minX(gameArea) + CheeseBlock.size.width/2,
                         max: CGRect.maxX(gameArea) - CheeseBlock.size.width/2)

    let randomY = random(min: CGRect.minY(gameArea) + CheeseBlock.size.height/2,
                         max: CGRect.maxY(gameArea) - CheeseBlock.size.height/2)

    CheeseBlock.position = CGPoint(x: randomX, y: randomY)
    self.addChild(CheeseBlock)

}

What type is `gameArea`? – nathangitter Oct 09 '17 at 21:20 — nathangitter, Oct 09 '17 at 21:20
CGRect. Globally I have "let gameArea = CGRect" – Nathan Chambers Oct 09 '17 at 21:24 — Nathan Chambers, Oct 09 '17 at 21:24

nathangitter · Accepted Answer · 2017-10-09T21:35:17.893

minX, maxX, etc are instance properties, which mean they need to be called on a CGRect instance, not the type itself.

Change

CGRect.minX(gameArea)

to

gameArea.minX

Side Note: It's important in Swift (and other languages as well) to understand the distinction between types and instances. In Swift the convention is to name types starting with capital letters and instances starting with lowercase letters.

Your line of code

let CheeseBlock = SKSpriteNode(imageNamed: "CheeseBlock\(randomImageNumber)")

should be changed to

let cheeseBlock = SKSpriteNode(imageNamed: "CheeseBlock\(randomImageNumber)")

This makes it easier to tell which variables are types and which are instances.

Thank you very much. I didn't even think of that. – Nathan Chambers Oct 09 '17 at 21:34 — Nathan Chambers, Oct 09 '17 at 21:34

Coding SpriteKit game and I am receiving "Instance member 'minX' cannot be used on type 'CGRect"

1 Answers1