Updating nodes in a SpriteKit scene from an outside UIViewController - ios

Question

How can I update SpriteKit Scene from outside the scene itself. E.g. how do I update a SKLabelNode by pressing a UIButton.
Scene
class GameScene: SKScene {
var myLabel:SKLabelNode = SKLabelNode()
override func didMoveToView(view: SKView) {
myLabel.text = "Initial State"
myLabel.position = CGPoint(x:CGRectGetMidX(self.frame), y:CGRectGetMidY(self.frame))
self.addChild(myLabel)
}
func didPressButton() {
myLabel.text = "Pressed! 👻"
}
ViewController
import UIKit
import SpriteKit
class GameViewController: UIViewController {
#IBAction func didPressButton(sender: AnyObject) {
if let scene = GameScene(fileNamed:"GameScene") {
scene.didPressButton()
}
}
override func viewDidLoad() {
super.viewDidLoad()
if let scene = GameScene(fileNamed:"GameScene") {
let skView = self.view as! SKView
skView.presentScene(scene)
}
}
…
}
I understand that the usual touchesBegan inside the scene works just fine for updating the SKLabelNode inside the scene. But I am specifically interested in updating the scene from outside events. Any ideas?

Answer 1

In the file where is your button:
protocol PauseBtnSelectorDelegate {
func didPressPauseBtn(pauseBtn:SKSpriteNode)
}
class HUD: SKNode {
var pauseBtnDelegate:PauseBtnSelectorDelegate?
var pauseBtn :SKSpriteNode!
...
func pauseBtnTap(sender:SKSpriteNode) {
print("pauseBtn touched")
pauseBtnDelegate!.didPressPauseBtn(sender)
}
}
In the file where you want to notify the tap event:
class GameScene: SKScene,PauseBtnSelectorDelegate {
var hud: HUD!
...
override func didMoveToView(view: SKView) {
super.didMoveToView(view)
// Adding HUD
self.hud = HUD(currentScene: self,nodeSize: self.frame.size)
self.hud.pauseBtnDelegate = self
self.addChild(hud)
}
func didPressPauseBtn(pauseBtn:SKSpriteNode) {
print("pauseBtn touched")
// Pause the game
}
}