initializing spritekit object with enum value for Image Name property

Question

Most of the SpriteKit code I've written so far just has a few objects so I put all the game logic in the GameScene. Now I am working on something more complex and I am trying to separate some of the objects into their own classes. How can I initialize the Orbita class below so that the simpleDescription string is used for the ImageName of the SKSpriteNode in GameScene?

class Orbita  {

var orbita : SKSpriteNode

init(orbita: SKSpriteNode) {
    self.orbita = orbita
    physics ()

}

func physics  ()  {
    orbita.physicsBody = SKPhysicsBody(circleOfRadius: orbita.frame.size.width/2)
    orbita.physicsBody?.friction = 0
   orbita.physicsBody?.restitution = 1
    orbita.physicsBody?.linearDamping = 0
    orbita.physicsBody?.angularDamping = 0
    orbita.physicsBody?.allowsRotation = false
    orbita.physicsBody?.applyImpulse(CGVectorMake(4, -4))

}

enum OrbitaType: Int  {

    case firstPlanet = 0, secondPlanet, thirdPlanet

    func simpleDescription()->String    {
        switch self {

        case .firstPlanet:
            return "green"

        case .secondPlanet:
            return "red"

        case .thirdPlanet:
            return "yellow"
        }
    }
  }}

UPDATE

This is what I've been able to do so far. I decided to make a number of changes

class Orbita  {

var sprite : SKSpriteNode
var orbitaType : OrbitaType

init(orbita: SKSpriteNode) {
    self.orbita = orbita
    physics ()

}

    init(orbitaType: OrbitaType, gameScene: GameScene) {
    self.orbitaType = orbitaType
    sprite = SKSpriteNode(imageNamed: orbitaType.simpleDescription())

    sprite.name = orbitaCategoryName
    sprite.position = CGPointMake(3*gameScene.frame.size.width/4, 3*gameScene.frame.size.height/4)

    sprite.zPosition = 10
    gameScene.addChild(sprite)

    physics()

}


func physics  ()  {
    sprite.physicsBody = SKPhysicsBody(circleOfRadius: sprite.frame.size.width/2)
    sprite.physicsBody?.friction = 0
   sprite.physicsBody?.restitution = 1
    sprite.physicsBody?.linearDamping = 0
    sprite.physicsBody?.angularDamping = 0
    sprite.physicsBody?.allowsRotation = false
    sprite.physicsBody?.applyImpulse(CGVectorMake(4, -4))

}

enum OrbitaType: Int  {

    case firstPlanet = 0, secondPlanet, thirdPlanet

    func simpleDescription()->String    {
        switch self {

        case .firstPlanet:
            return "green"

        case .secondPlanet:
            return "red"

        case .thirdPlanet:
            return "yellow"
        }
    }
  }}

In the GameScene class I added the following:

var newOrbita = Orbita(orbitaType: 0, gameScene: self)

But I keep getting the following error:

Cannot invoke initializer for type 'Orbita' with an argument list of type '(orbitaType: Int, gameScene: GameScene)'

Also, how can I add newOrbita as a class variable of GameScene since I am using GameScene as an argument?

Your error pertains to Ball, but there is no mention of Ball in the code. — jtbandes
– jtbandes, Commented Aug 29, 2015 at 5:23
sorry about that, I got the code mixed with some commented stuff, I just made the correction. I'm still getting the same error — NSologistic
– NSologistic, Commented Aug 29, 2015 at 5:30

jtbandes · Accepted Answer · 2015-08-29 05:31:16Z

2

orbitaType parameter is an OrbitaType, not an Int. You'll need to pass something like Orbita(orbitaType: .firstPlanet, ....

answered Aug 29, 2015 at 5:31

jtbandes

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6 Comments

NSologistic Over a year ago

I guess I have to do some rawValue conversion or so to pass Int. How is this done?

jtbandes Over a year ago

You can create OrbitaType(rawValue: ...). Just curious, why do you need to pass an Int? Usually using enum constants by name is preferred since it's more readable.

NSologistic Over a year ago

how can I add newOrbita as a class variable of GameScene since I am using GameScene as an argument?

jtbandes Over a year ago

Why are you passing it as an argument? It seems there's no need. Makes sense for the scene to own the object.

NSologistic Over a year ago

In the init I add the sprite as a child. That's the main reason. As for the position, I can easily work around that.

|

Michael Berk · Accepted Answer · 2015-08-28 03:57:44Z

0

To access anything from a separate class, you have to create an instance of that class: In gameScene:

let orbitaInstance = Orbita() //let instanceName = classYouWantToAccess()

Then, inside of any function:

let image = SKSpriteNode(image: orbitaInstance.simpleDescription) // instanceOfClassYouAreAccessing.nameOfFunctionOrVariableYouAreAccessing

Hope this helped and good luck.

answered Aug 28, 2015 at 3:57

Michael Berk

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