Access Geometry Child Node Scenekit - swift

Question

I am trying to access the childnode: boxNode, and then rotate the node using the input from a pan gesture recognizer. How should I access this node so I can manipulate it? Should I declare the cube node in a global scope and modify that way? I am new to Swift so I apologize if this code looks sloppy. I would like to add rotation actions inside of my panGesture() function. Thanks!
import UIKit
import SceneKit
class GameViewController: UIViewController {
var scnView: SCNView!
var scnScene: SCNScene!
override func viewDidLoad() {
super.viewDidLoad()
setupView()
setupScene()
}
// override var shouldAutorotate: Bool {
// return true
// }
//
// override var prefersStatusBarHidden: Bool {
// return true
// }
func setupView() {
scnView = self.view as! SCNView
}
func setupScene() {
scnScene = SCNScene()
scnView.scene = scnScene
scnView.backgroundColor = UIColor.blueColor()
initCube()
initLight()
initCamera()
}
func initCube () {
var cubeGeometry:SCNGeometry
cubeGeometry = SCNBox(width: 1.0, height: 1.0, length: 1.0, chamferRadius: 0.0)
let boxNode = SCNNode(geometry: cubeGeometry)
scnScene.rootNode.addChildNode(boxNode)
}
func initLight () {
let light = SCNLight()
light.type = SCNLightTypeAmbient
let lightNode = SCNNode()
lightNode.light = light
light.castsShadow = false
lightNode.position = SCNVector3(x: 1.5, y: 1.5, z: 1.5)
scnScene.rootNode.addChildNode(lightNode)
}
func initCamera () {
let camera = SCNCamera()
let cameraNode = SCNNode()
cameraNode.camera = camera
cameraNode.position = SCNVector3(x: 0.0, y: 0.0, z: 5.0)
scnScene.rootNode.addChildNode(cameraNode)
}
func initRecognizer () {
let panTestRecognizer = UIPanGestureRecognizer(target: self, action: #selector(GameViewController.panGesture(_:)))
scnView.addGestureRecognizer(panTestRecognizer)
}
//TAKE GESTURE INPUT AND ROTATE CUBE ACCORDINGLY
func panGesture(sender: UIPanGestureRecognizer) {
//let translation = sender.translationInView(sender.view!)
}
}

Answer 1

First of all you should update your Xcode. It looks like this is an older Swift version you are using. SCNLightTypeAmbient is .ambient in Swift 3.
So the way you should go is by giving your nodes names to identify them:
myChildNode.name = "FooChildBar"
and then you can call on your parent node
let theNodeYouAreLookingFor = parentNode.childNode(withName: "FooChildBar", recursively: true)
You can also use this on your scene's root node
let theNodeYouAreLookingFor = scene.rootNode.childNode(withName: "FooChildBar", recursively: true)
which will look at all nodes in your scene and return the one that you gave the name.