Have a Spritekit display a Integer thats stored in a Variable - ios

Question

So I'm having difficulty trying to do something that should be easy, clearly I don't see whats wrong.
This is the code:
import SpriteKit
var money = "0"
class GameScene: SKScene {
override func didMoveToView(view: SKView) {
/* Setup your scene here */
let moneyLabel = SKLabelNode(fontNamed:"Times New Roman")
moneyLabel.text = money;
moneyLabel.fontSize = 14;
moneyLabel.position = CGPoint(x:CGRectGetMidX(self.frame), y:CGRectGetMidY(self.frame));
self.addChild(moneyLabel)
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
/* Called when a touch begins */
for touch in touches {
money + 1
}
}
override func update(currentTime: CFTimeInterval) {
/* Called before each frame is rendered */
}
}
What this is suppose to do is have a label display a Variable, and when the user touches the screen the variable changes by 1, going up by 1 each time its pressed. The Label is suppose to change with the variable.
How do I make this work?

Answer 1

The problem
You are simply adding 1 to money
money + 1
This code:
does not change the money property
does not change the text in you moneyLabel
is illegal since you cannot sum a String and an Int
Solution
This code should do the job
import SpriteKit
class GameScene: SKScene {
private var money = 0 {
didSet {
self.moneyLabel?.text = money.description
}
}
private var moneyLabel : SKLabelNode?
override func didMoveToView(view: SKView) {
let moneyLabel = SKLabelNode(fontNamed:"Times New Roman")
moneyLabel.text = money.description
moneyLabel.fontSize = 14
moneyLabel.position = CGPoint(x:CGRectGetMidX(self.frame), y:CGRectGetMidY(self.frame))
self.addChild(moneyLabel)
self.moneyLabel = moneyLabel
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
money += touches.count
}
}
Explaination
1)
As you can se I added an observer to the money property (by the way I made it an Int property, not a String as in your code!).
didSet {
self.moneyLabel?.text = money.description
}
Thanks to the observer, each time the money changes, the moneyLabel node is retrieved and it text gets updated.
2)
At the end of didMoveToView I am saving moneyLabel into an instance property
self.moneyLabel = moneyLabel
so I can easily retrieve (we have seen this in the previous point)
3)
Finally in touchesBegan I simply increase the money property by the number of received touches.
money += touches.count
Thanks to the observer, each change to the money property does trigger an updated to the text inside the moneyLabel node.
Hope this helps.

Answer 2

There are three problems here:
money should be an Int, so you can add to it.
You haven't actually updated money to a new value.
You'll need to update the label in addition to money.
Take a look at the changes below; each comment explains why a change was necessary:
import SpriteKit
class GameScene: SKScene {
var money = 0 //now an Int, so we can add to it later
let moneyLabel = SKLabelNode(fontNamed:"Times New Roman") //keep this around so we can update it later
override func didMoveToView(view: SKView) {
moneyLabel.text = String(money) //convert money to a String so we can set the text property to it
moneyLabel.fontSize = 14
moneyLabel.position = CGPoint(x:CGRectGetMidX(self.frame), y:CGRectGetMidY(self.frame))
self.addChild(moneyLabel)
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
for touch in touches {
money = money + 1 //update money to itself + 1
moneyLabel.text = String(money) //update the label, too
}
}
}