I have a simple Button class in a parent scene that runs a function when tapped. It works perfectly now, as you pass the function name to the Button when creating it. However, to provide a bit more flexibility, I would like to pass arguments with the function, so that I could run e.g. myFunction(argument: Int) rather than myFunction1, myFunction2, ... I remember with Obj-C it would happen through using Selectors, but I never fully understood them earlier, either.
How do I change my Button class to allow the passing of arguments along with the function?
Button.swift
import SpriteKit
class Button: SKNode {
var background: SKSpriteNode?
var action: () -> Void
init(buttonSize: CGSize, buttonBackgroundColor: SKColor, buttonAction: () -> Void) {
action = buttonAction
super.init()
userInteractionEnabled = true
background = SKSpriteNode(color: buttonBackgroundColor, size: buttonSize)
addChild(background!)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
if let location = touches.first?.locationInNode(self) {
if background!.containsPoint(location) { action() }
}
}
}Scene.swift
let button: Button = Button(buttonSize: CGSize(width: 100.0, height: 100.0), buttonBackgroundColor: SKColor.whiteColor(), buttonAction: myFunction)
addChild(button)
func myFunction() {
// Do something!
}You can pass a closure without modifying you Button class:
let button: Button = Button(buttonSize: CGSize(width: 100.0, height: 100.0),
buttonBackgroundColor: SKColor.whiteColor(),
buttonAction: {() in self.funcWithArgs("X")})
//...
func funcWithArgs(arg1: String) {
// Do something more!
}