Editing properties of an SKSpriteNode custom class? - swift

Question

In my custom SKSpriteNode class, I want to be able to change properties such as anchorPoint, posistion, etc. within the custom class so I don't need to elsewhere.
import Foundation
import SpriteKit
open class Crank:SKSpriteNode {
init() {
super.init(texture: SKTexture(imageNamed: "crank"), color:
NSColor.white, size: CGSize(width: 155.0, height: 188.0))
}
required public init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
How would I edit other properties?

Answer 1

import Foundation
import SpriteKit
class Crank: SKSpriteNode {
init(imageNamed image: String, position at: CGPoint, withAnchor anchor: CGPoint) {
super.init(imageNamed: image)
self.position = position
self.anchorPoint = anchor
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
(Written from memory, so may contain small errors, but is broadly correct).
and then in your main code:
let myCrank = Crank(imageNamed: "Crank.png", at: CGPoint(300, 500), withAnchor: CGpointZero)
My answer notwithstanding, Alessandro has a point. I think that it's better to set 'standard' properties in the normal place.
If you are going to set any of the standard SKSpriteNode properties inside the actual class, then I think specifying them in an initialiser is good practice as it makes the m more visible,. Debugging a program where you don't appears to set a node's position, or texture etc. would be problematic.

Answer 2

Another way to do it would be to create a protocol and apply it to the standard SpriteKit classes that you are subclassing (or their ancestor).
For example:
protocol CustomSKNode
{
var position:CGFloat { get set }
var zRotation:CGFloat { get set }
// ...
}
extension SKNode: CustomSKNode {}
Once you've done this somewhere in your project, you'll be able to access these properties of on any of your custom SKNode or SKSpriteNode without having to import SpriteKit.