Swift: Value Of A Variable Public But Still Local? - swift

Question

I change the value in a function and want to access the value in another function within the same class. My code:
class person{
var fieldsWidth = CGFloat()
var xPos = CGFloat()
var yPos = CGFloat()
var player = SKSpriteNode()
func addPlayer(gameScene: GameScene, x: CGFloat, y: CGFloat){
fieldsWidth = gameScene.screenWidth / CGFloat(hintergrund().fieldsX)
player = SKSpriteNode(imageNamed: "player")
player.size = CGSize(width: fieldsWidth, height: fieldsWidth)
player.position = CGPoint(x: x, y: y)
gameScene.addChild(player)
xPos = x
}
func move(gameScene: GameScene, point: CGPoint, fWidth: CGFloat){
print(xPos)
}
}
and the GameScene:
class GameScene: SKScene {
var screenWidth = CGFloat()
var screenHeight = CGFloat()
var touchLocation = CGFloat()
var fieldsWidth = CGFloat()
let player = person()
override func didMoveToView(view: SKView) {
screenWidth = self.size.width
screenHeight = self.size.height
fieldsWidth = screenWidth / CGFloat(hintergrund().fieldsX)
person().addPlayer(self, x: fieldsWidth/2, y: fieldsWidth/2)
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
/* Called when a touch begins */
let touch = touches.first
var point = CGPoint()
point = touch!.locationInNode(self)
player.move(self, point: point, fWidth: fieldsWidth)
}
}
Somehow the value of xPos is just local in addPlayer. How can I access the value from xPos correctly? Hopefully you can help me.

Answer 1

The following code runs exactly as expected for me in a XCode Version 7.1 (7B91b) playground
class person{
var yPos = CGFloat()
func function1(y: CGFloat){
yPos = y
print(yPos) //Value of yPos is 31.25; correct!
}
func function2(){
print(yPos) //Value of yPos is 0.0; wrong!??
}
}
let foo = person()
foo.function1(31.25)
foo.function2() //Outputs 31.25

Answer 2

I think CGFloat is 0.0 by default so the most likely cause of your error is that you call function 2 before function one in your code. The error is somewhere else.
EDIT since you posted code. I would try this (create a new player and retain it -- I am not a sprite kit expert):
class GameScene: SKScene {
var screenWidth = CGFloat()
var screenHeight = CGFloat()
var touchLocation = CGFloat()
var fieldsWidth = CGFloat()
var player = person() // SEE HERE - Variable, so that you can reassign it
override func didMoveToView(view: SKView) {
screenWidth = self.size.width
screenHeight = self.size.height
fieldsWidth = screenWidth / CGFloat(hintergrund().fieldsX)
player = person().addPlayer(self, x: fieldsWidth/2, y: fieldsWidth/2) // SEE HERE - Create new player and retain it into your scene
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
/* Called when a touch begins */
let touch = touches.first
var point = CGPoint()
point = touch!.locationInNode(self)
player.move(self, point: point, fWidth: fieldsWidth)
}
}
PS: The above might work but really, from what I understand you need to create a player each time didMoveToView is called. If that is the case, then instead of doing this contrived addPlayer funciton, I would make a designated initialiser for the player class. Something like (untested):
func init(scene: SKScene, x: CGFLoat, y: CGFloat) {
// ETC...
}