How to chain multiple collada animations using Swift in Xcode? - swift

Question

I am having trouble loading four collada animations in a sequence. Using this code, the animations start at the same time and there is no sequence between each other. I would like to star with SU.dae then FTW.dae and so on, such as large animation using Xcode.
Does anyone know how to properly fix this issues?
import UIKit
import SceneKit
import ARKit
class ViewController: UIViewController, ARSCNViewDelegate {
#IBOutlet var sceneView: ARSCNView!
var animations = [String: CAAnimation]()
var Stand_Up:Bool = true
override func viewDidLoad() {
super.viewDidLoad()
// Set the view's delegate
sceneView.delegate = self
// Show statistics such as fps and timing information
sceneView.showsStatistics = true
// Create a new scene
let scene = SCNScene()
// Set the scene to the view
sceneView.scene = scene
// Loaf the DAE amimation
loadAnimations (sceneName: "art.scnassets/animation/SU.dae")
loadAnimations (sceneName: "art.scnassets/animation/FTW.dae")
loadAnimations (sceneName: "art.scnassets/animation/R.dae")
loadAnimations (sceneName: "art.scnassets/animation/BAE.dae")
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// Create a session configuration
let configuration = ARWorldTrackingConfiguration()
// Run the view's session
sceneView.session.run(configuration)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
// Pause the view's session
sceneView.session.pause()
}
func loadAnimations (sceneName:String) {
// Load the character in the idle animation
let idleScene = SCNScene(named: sceneName)!
// This node will be parent of all the animation models
let node = SCNNode()
// Add all the child nodes to the parent node
for child in idleScene.rootNode.childNodes {
node.addChildNode(child)
}
// Set up some properties
node.position = SCNVector3(0, -1, -2)
node.scale = SCNVector3(0.2, 0.2, 0.2)
// Add the node to the scene
sceneView.scene.rootNode.addChildNode(node)
animateEntireNodeTreeOnce(mostRootNode: node)
}
func animateEntireNodeTreeOnce(mostRootNode node: SCNNode){
onlyAnimateThisNodeOnce(node)
for childNode in node.childNodes {
animateEntireNodeTreeOnce(mostRootNode: childNode)
}
}
func onlyAnimateThisNodeOnce(_ node: SCNNode) {
if node.animationKeys.count > 0 {
for key in node.animationKeys {
let animation = node.animation(forKey: key)!
animation.repeatCount = 1
animation.duration = 5;
animation.isRemovedOnCompletion = false
node.removeAllAnimations()
node.addAnimation(animation, forKey: key)
}
}
}
func session(_ session: ARSession, didFailWithError error: Error) {
// Present an error message to the user
}
func sessionWasInterrupted(_ session: ARSession) {
// Inform the user that the session has been interrupted, for example, by presenting an overlay
}
func sessionInterruptionEnded(_ session: ARSession) {
// Reset tracking and/or remove existing anchors if consistent tracking is required
}
}