Pausing Animation in SceneKit - swift

Question

I loaded into SceneKit a .usdz file which has an animation attached to it. I want to stop this animation to play.. but I can't find the right way.
I load the .usdz asset file with the following method:
func loadIdle() {
let urlfile = Bundle.main.path(forResource: "armi_idle",
ofType: "usdz",
inDirectory: "Asset.scnassets")!
let scene = try! SCNScene(url: URL(string: urlfile)!)
guard let findNode = scene.rootNode.childNode(withName: "armi_idle",
recursively: true)
else {
print("err finde idle")
return
}
// try to pause, but not work
findNode.isPaused = true
// add to main scene
self.scene.rootNode.addChildNode(findNode)
}
A picture of the asset:

Answer 1

Declare the following properties:
import SceneKit
#IBOutlet var sceneView: SCNView!
var notWalking: Bool = true
var animations = [String: CAAnimation]()
var node = SCNNode()
override func viewDidLoad() {
super.viewDidLoad()
sceneView.scene = SCNScene()
self.animation()
}
Then try the following logic (you need Idle and Walking files) :
fileprivate func loadAnimation(withKey: String, scene: String, id: String) {
let url = Bundle.main.url(forResource: scene, withExtension: "dae")!
let source = SCNSceneSource(url: url, options: nil)
guard let character = source?.entryWithIdentifier(id,
withClass: CAAnimation.self) else { return }
character.fadeInDuration = 0.5
character.fadeOutDuration = 0.5
self.animations[withKey] = character
}
then:
fileprivate func animation() {
let standStill = SCNScene(named: "art.scnassets/Idle")!
for childNode in standStill.rootNode.childNodes {
self.node.addChildNode(childNode)
}
sceneView.scene.rootNode.addChildNode(self.node)
self.loadAnimation(withKey: "walking", scene: "art.scnassets/Walking",
id: "Walking-1")
}
and then:
func playWalking(key: String) {
sceneView.scene.rootNode.addAnimation(animations[key]!, forKey: key)
}
func stopWalking(key: String) {
sceneView.scene.rootNode.removeAnimation(forKey: key,
blendOutDuration: 0.75)
}
and at last:
#IBAction func pressed(_ sender: UIButton) {
notWalking ? playWalking(key: "walking") : stopWalking(key: "walking")
notWalking.toggle()
}