add custom property to custom class and initialize class - swift

Question

I am trying to initialize a custom class that inherits from SKSpriteNode. Currently the class definition looks like this
import SpriteKit
class PassengerNode: SKSpriteNode {
let passengerStart: Int = 2
let passengerDestination: Int = 0
init() {
let texture = SKTexture(imageNamed: "passenger1")
super.init(texture: texture, color: UIColor.clearColor(), size: texture.size())
self.zPosition = 100
}
required init(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func updateTexture(newTexture: SKTexture) {
self.texture = newTexture
}
}
I want to have passengerStart and passsengerDestination assigned to the Object, respectively to the instance of the class. And ideally these both values can be different with every instantiation.
When I instantiate the Class Object I think of something like
let newObject = PassengerNode(start: 1, destination: 0, texture: "passenger1")
But I dont get it working... How do I need to change my init?
Does someone have a helping thought?
Thanks in advance.

Answer 1

You have to write an init method for your subclass which takes those
three parameters:
class PassengerNode: SKSpriteNode {
let passengerStart: Int
let passengerDestination: Int
init(start: Int, destination: Int, texture: String) {
let texture = SKTexture(imageNamed: texture)
passengerStart = start
passengerDestination = destination
super.init(texture: texture, color: UIColor.clearColor(), size: texture.size())
self.zPosition = 100
}
required init(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
// ... more methods ...
}
The init method must initialize the properties of the subclass and
then call super.init.