Adding a spark particle sprite inside a view controller - ios

I created an .sks particle emitter based on the spark template.
My app is a normal app (not a game). When a user clicks a button, I have a new View controller that shows modally over fullscreen so that I can blur the background.
In this modal, I created a view and gave it a class of SCNView see image below:
How can I load the particle .sks file to do the animation on that viewController on the Particles view?
Update
How to load a SceneKit particle systems in view controller?

As mentioned by #mnuages, you can use .scnp file instead of .sks, which is a SceneKit Particle System.
So the steps are:
Create a SceneKit Particle System, I called it ConfettiSceneKitParticleSystem.scnp
Then in your art-board, select the view and select the class SCNView for it like in the printscreen of the question
In your UIViewController:
class SomeVC: UIViewController {
#IBOutlet weak var particles: SCNView!
override func viewDidLoad() {
super.viewDidLoad()
let scene = SCNScene()
let particlesNode = SCNNode()
let particleSystem = SCNParticleSystem(named: "ConfettiSceneKitParticleSystem", inDirectory: "")
particlesNode.addParticleSystem(particleSystem!)
scene.rootNode.addChildNode(particlesNode)
particles.scene = scene
}
}
Et Voila...you have you animation :)

.sks files are SpriteKit particle systems. You can also create SceneKit particle systems in Xcode, they are .scnp files.
A .scnp file is basically an archived SCNParticleSystem that you can load with NSKeyedUnarchiver and add to your scene using -addParticleSystem:withTransform:.

It might be easier to create a SpriteKit Particle File (which is what you did). You can add it to your main view in your UIViewController.
Add this somewhere:
extension SKView {
convenience init(withEmitter name: String) {
self.init()
self.frame = UIScreen.main.bounds
backgroundColor = .clear
let scene = SKScene(size: self.frame.size)
scene.backgroundColor = .clear
guard let emitter = SKEmitterNode(fileNamed: name + ".sks") else { return }
emitter.name = name
emitter.position = CGPoint(x: self.frame.size.width / 2, y: self.frame.size.height / 2)
scene.addChild(emitter)
presentScene(scene)
}
}
To use:
override func viewWillAppear(_ animated: Bool) {
view.addSubview(SKView(withEmitter: "ParticleFileName"))
}

Related

SCNCamera made programmatically not in the correct position

I am trying to programmatically create a camera for my MainScene.scn file.
I need to create the camera in code, as I am wanting to make a camera orbit node, and this is the only way I can think of. I also would like to keep using my scene file.
This is my code (simplified) from my view controller:
import UIKit
import SceneKit
class GameViewController: UIViewController {
// MARK: Scene objects
private var gameView: SCNView!
private var gameScene: SCNScene!
private var gameCameraNode: SCNNode!
// MARK: View controller overrides
override func viewDidLoad() {
super.viewDidLoad()
// Setup game
initView()
initScene()
initCamera()
}
}
private extension GameViewController {
// Initialise the view and scene
private func initView() {
self.view = SCNView(frame: view.bounds) // Create an SCNView to play the game within
gameView = self.view as? SCNView // Assign the view
gameView.showsStatistics = true // Show game statistics
gameView.autoenablesDefaultLighting = true // Allow default lighting
gameView.antialiasingMode = .multisampling2X // Use anti-aliasing for a smoother look
}
private func initScene() {
gameScene = SCNScene(named: "art.scnassets/MainScene.scn")! // Assign the scene
gameView.scene = gameScene // Set the game view's scene
gameView.isPlaying = true // The scene is playing (not paused)
}
private func initCamera() {
gameCameraNode = SCNNode()
gameCameraNode.camera = SCNCamera()
gameCameraNode.position = SCNVector3(0, 3.5, 27)
gameCameraNode.eulerAngles = SCNVector3(-2, 0, 0)
gameScene.rootNode.addChildNode(gameCameraNode)
gameView.pointOfView = gameCameraNode
}
}
This code can easily be pasted to replace the default view controller code. All you need to do is add the MainScene.scn and drag in something like a box.
If you try the code, the camera is in the wrong position. If I use the same properties for the camera in the scene, it works, but that is not what I am looking for.
From what I have read, SceneKit may be creating a default camera as said here and here. However, I am setting the pointOfView property just as they said in those answers, but it still does not work.
How can I place my camera in the correct position in the scene programmatically?
After a while, I discovered that you can actually add empty nodes directly within the Scene Builder. I originally only wanted a programmatic answer, as I wanted to make a camera orbit node like the questions I linked to. Now I can add an empty node, I can make the child of the orbit the camera.
This requires no code, unless you want to access the nodes (e.g. changing position or rotation):
gameCameraNode = gameView.pointOfView // Use camera object from scene
gameCameraOrbitNode = gameCameraNode.parent // Use camera orbit object from scene
Here are the steps to create an orbit node:
1) Drag it in from the Objects Library:
2) Setup up your Scene Graph like so:

Multiple Views In Xcode Swift Playground

I am creating a swift playground I want to create multiple views, first an introduction screen then a SpriteKit game then a conclusion screen.
How can I change between views in Xcode playground.
Here is a picture that show first and 2 and 3 view in sources that I want to display by order
How can I change views between these 3 files and there is no storyboard. What code should I put in MyPlayground.
In your playground file, you create your scene view like this:
let sceneView = SKView(frame: CGRect(x:0 , y:0, width: 640, height: 480))
let myScene = FirstView(fileNamed: "MyPlayground")
if let scene = myScene {
scene.scaleMode = .aspectFill
sceneView.presentScene(scene)
}
PlaygroundSupport.PlaygroundPage.current.liveView = sceneView
And in your First View file, create your FirstView class. Do not forget to put it as public:
import Foundation
import SpriteKit
public class FirstView: SKScene {
private var label : SKLabelNode!
open override func didMove(to view: SKView) {
// Get label node from scene and store it for use later
label = SKLabelNode(text: "first view")
label.position = view.center
addChild(label)
}
}

Why can't I set SKScene(fileNamed:) in GameViewController?

The relevant code is copied below and I also put a simple test project on Github to demonstrate this situation:
https://github.com/prinomen/viewPresentSceneTest
I have a GameViewController and a GameScene class. I try to set the scene with SKScene(fileNamed: "GameScene") but that call is not working because the scene does not appear and the print statement after that line is not being called.
I know I could use a different way to set the scene, like this:
let scene = GameScene()
But I'm trying to understand SpriteKit and it bothers me that the code below does not work. In another project I was able to successfully set the scene using SKScene(fileNamed: "GameScene") like in the code below.
Does anyone know why it is not working in this project?
GameViewController.swift
import SpriteKit
class GameViewController: UIViewController {
override func viewWillLayoutSubviews() {
super.viewWillLayoutSubviews()
if let view = self.view as! SKView? {
// Load the SKScene from 'GameScene.sks'
if let scene = SKScene(fileNamed: "GameScene") {
print("SKScene was set")
// Set the scale mode fit the window:
scene.scaleMode = .aspectFill
// Size our scene to fit the view exactly:
scene.size = view.bounds.size
// Show the new scene:
view.presentScene(scene)
}
}
}
}
GameScene.swift
import SpriteKit
class GameScene: SKScene {
override func didMove(to view: SKView) {
self.anchorPoint = CGPoint(x: 0.5, y: 0.5)
let logoText = SKLabelNode(fontNamed: "AvenirNext-Heavy")
logoText.text = "Game Scene"
logoText.position = CGPoint(x: 0, y: 100)
logoText.fontSize = 60
self.addChild(logoText)
}
}
I believe you need an .sks file to load scenes like that. You probably deleted it from this project, but still kept it around in the other one.
Here's what the documentation says:
The name of the file, without a file extension. The file must be in
the app’s main bundle and have a .sks filename extension.

linking GameViewController.swift to GameScene.swift

I have created a UI elements on main.storyboard which i require to be hidden until the game is over and the once the player tap the screen to dismiss. Main.storyboard is linked to GameViewController therefor all my IBOutlets and IBActions are in there and all my game code is in GameScene. How can i link the view controller to the scene for that the popup image and buttons only appear when it is game over. Would greatly appreciate some help, I have been stuck on this for quite some time now.
This seems to be quite a common problem people have with SpriteKit games so lets go through the difference between SpriteKit games and UIKit apps.
When you make a regular UIKit app, e.g. YouTube, Facebook, you would use ViewControllers, CollectionViews, Views etc for each screen/menu that you see (Home screen, Channel screen, Subscription channel screen etc). So you would use UIKit APIs for this such as UIButtons, UIImageViews, UILabels, UIViews, UICollectionViews etc. To do this visually we would use storyboards.
In SpriteKit games on the other hand it works differently. You work with SKScenes for each screen that you see (MenuScene, SettingsScene, GameScene, GameOverScene etc) and only have 1 ViewController (GameViewController). That GameViewController, which has a SKView in it, will present all your SKScenes.
So we should add our UI directly in the relevant SKScenes using SpriteKit APIs such as SKLabelNodes, SKSpriteNodes, SKNodes etc. To do this visually we would use the SpriteKit scene level editor and not storyboards.
So the general logic would be to load your 1st SKScene as usual from the GameViewController and than do the rest from within the relevant SKScenes. Your GameViewController should basically have next to no code in it beyond the default code. You can also transition from 1 scene to another scene very easily (GameScene -> GameOverScene).
If you use GameViewController for your UI it will get messy really quickly if you have multiple SKScenes because UI will be added to GameViewController and therefore all SKScenes. So you would have to remove/show UI when you transition between scenes and it would be madness.
To add a label in SpriteKit it would be something like this
class GameScene: SKScene {
lazy var scoreLabel: SKLabelNode = {
let label = SKLabelNode(fontNamed: "HelveticaNeue")
label.text = "SomeText"
label.fontSize = 22
label.fontColor = .yellow
label.position = CGPoint(x: self.frame.midX, y: self.frame.midY)
return label
}()
override func didMove(to view: SKView) {
addChild(scoreLabel)
}
}
To make buttons you essentially create a SKSpriteNode and give it a name and then look for it in touchesBegan or touchesEnded and run an SKAction on it for animation and some code after.
enum ButtonName: String {
case play
case share
}
class GameScene: SKScene {
lazy var shareButton: SKSpriteNode = {
let button = SKSpriteNode(imageNamed: "ShareButton")
button.name = ButtonName.share.rawValue
button.position = CGPoint(x: self.frame.midX, y: self.frame.midY)
return button
}()
override func didMove(to view: SKView) {
addChild(shareButton)
}
/// Touches began
override open func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch in touches {
let location = touch.location(in: self)
let node = atPoint(location)
if let nodeName = node.name {
switch nodeName {
case ButtonName.play.rawValue:
// run some SKAction animation and some code
case ButtonName.share.rawValue:
let action1 = SKAction.scale(to: 0.9, duration: 0.2)
let action2 = SKAction.scale(to: 1, duration: 0.2)
let action3 = SKAction.run { [weak self] in
self?.openShareMenu(value: "\(self!.score)", image: nil) // image is nil in this example, if you use a image just create a UIImage and pass it into the method
}
let sequence = SKAction.sequence([action1, action2, action3])
node.run(sequence)
default:
break
}
}
}
}
}
To make this even easier I would create a button helper class, for a simple example have a look at this
https://nathandemick.com/2014/09/buttons-sprite-kit-using-swift/
You can also check out Apple's sample game DemoBots for a more feature rich example.
This way you can have things such as animations etc in the helper class and don't have to repeat code for each button.
For sharing, I would actually use UIActivityController instead of those older Social APIs which might become deprecated soon. This also allows you to share to multiple services via 1 UI and you will also only need 1 share button in your app. It could be a simple function like this in the SKScene you are calling it from.
func openShareMenu(value: String, image: UIImage?) {
guard let view = view else { return }
// Activity items
var activityItems = [AnyObject]()
// Text
let text = "Can you beat my score " + value
activityItems.append(text as AnyObject)
// Add image if valid
if let image = image {
activityItems.append(image)
}
// Activity controller
let activityController = UIActivityViewController(activityItems: activityItems, applicationActivities: nil)
// iPad settings
if Device.isPad {
activityController.popoverPresentationController?.sourceView = view
activityController.popoverPresentationController?.sourceRect = CGRect(x: view.bounds.midX, y: view.bounds.midY, width: 0, height: 0)
activityController.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection.init(rawValue: 0)
}
// Excluded activity types
activityController.excludedActivityTypes = [
UIActivityType.airDrop,
UIActivityType.print,
UIActivityType.assignToContact,
UIActivityType.addToReadingList,
]
// Present
view.window?.rootViewController?.present(activityController, animated: true)
}
and then call it like so when the correct button was pressed (see above example)
openShareMenu(value: "\(self.score)", image: SOMEUIIMAGE)
Hope this helps
create reference of GameViewController in GameScene class like this way
class GameScene: SKScene, SKPhysicsContactDelegate {
var referenceOfGameViewController : GameViewController!
}
in GameViewController pass the reference like this way
class GameViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
if let view = self.view as! SKView? {
// Load the SKScene from 'GameScene.sks'
if let scene = GameScene(fileNamed: "GameScene") {
// Set the scale mode to scale to fit the window
scene.scaleMode = .aspectFill
scene.referenceOfGameViewController = self
// Present the scene
view.presentScene(scene)
}
view.ignoresSiblingOrder = true
view.showsFPS = true
view.showsNodeCount = true
}
}
}
by using this line you can pass reference to GameScene class
scene.referenceOfGameViewController = self
Now In GameScene class you can access all the variable of GameViewController like this way
referenceOfGameViewController.fbButton.hidden = false
referenceOfGameViewController.gameOverPopUP.hidden = false

Passing variable from UIViewController to SK Scene

I'm making an a game in XCode 7 using Swift 2. I have a variable that I want to pass from the start screen (which is an UIViewController) to the game scene (which is an SKScene). I want the player to select a character in a UIView and play with it in the SKScene. I also want the score that's in the SKScene to show in the game-over screen that's an UIView. I've seen tutorials for passing data between two UIViewControllers and between two SKScenes, but none of them work for this case.
How can I pass a variable from an UIViewController to a SKScene (and vice versa)?
I ran over this same problem yesterday.
Swift 5.2, xcode 12 and targeting iOS 14. Searched high and low. Eventually found the userData attribute of the SKScene.
Note: The app is based on SwiftUI and the SKScene is inside a UIViewRepresentable:
struct SpriteKitContainer: UIViewRepresentable {
typealias UIViewType = SKView
var skScene: SKScene!
#Binding var timerData : ModelProgressTimer
Not that I am passing a binding into the View - this contains a number of data items I wanted to make available to the scene.
I placed code in two places to populate skScene.userData:
func makeUIView(context: Context) -> SKView {
self.skScene.scaleMode = .resizeFill
self.skScene.backgroundColor = .green
debugPrint("setting user data")
self.skScene.userData = [:]
self.skScene.userData!["color"] = UIColor(timerData.flatColorTwo!)
self.skScene.userData!["running"] = timerData.isRunning
self.skScene.userData!["percent"] = timerData.percentComplete
let view = SKView(frame: .zero)
view.preferredFramesPerSecond = 60
// view.showsFPS = true
// view.showsNodeCount = true
view.backgroundColor = .clear
view.allowsTransparency = true
return view
}
func updateUIView(_ view: SKView, context: Context) {
self.skScene.userData = [:]
self.skScene.userData!["running"] = timerData.isRunning
self.skScene.userData!["color"] = UIColor(timerData.flatColorTwo!)
self.skScene.userData!["percent"] = timerData.percentComplete
view.presentScene(context.coordinator.scene)
}
Then, inside the skScene object, I am able to retrieve the userData values:
var item: SKShapeNode! = nil
override func sceneDidLoad() {
let scaleUp = SKAction.scale(by: 2.0, duration: 1.0)
let scaleDown = SKAction.scale(by: 0.5, duration: 1.0)
scaleUp.timingMode = .easeInEaseOut
scaleDown.timingMode = .easeInEaseOut
let sequence = SKAction.sequence([scaleUp,scaleDown])
actionRepeat = SKAction.repeatForever(sequence)
item = SKShapeNode(circleOfRadius: radius)
addChild(item)
}
override func didChangeSize(_ oldSize: CGSize) {
item.fillColor = self.userData!["color"] as! UIColor
item.strokeColor = .clear
let meRunning = self.userData!["running"] as! Bool
if meRunning {
item.run(actionRepeat)
} else {
item.removeAllActions()
}
}
This draws a circle that "pulses" if the "running" boolean is set in the userdata (a Bool value).
If you haven't already found the answer, I did find a way to do this. I was doing something very similar.
In my case I have a UIView that gets called as a pause menu from my scene. I have made the class and variable names a little more ambiguous so they can apply to your situation as well.
class MyView: UIView {
var scene: MyScene!
var button: UIButton!
init(frame: CGRect, scene: MyScene){
super.init(frame: frame)
self.scene = scene
//initialize the button
button.addGestureRecognizer(UITapGestureRecognizer(target: self, action: "buttonTapped"))
}
func buttonTapped(){
self.removeFromSuperview() // this removes my menu from the scene
scene.doTheThing() // this calls the method on my scene
}
Here are the relevant parts of my scene.
class MyScene: SKScene {
func doTheThing(){
//this is a function on the scene. You can pass any variable you want through the function.
}
}
In your situation, it sounds like the first screen is a UIView and the second screen is the SKScene.
You may want to make your SKScene first, pause it, and then add the UIView in front of the Scene. Once the character is selected, you can remove the UIView and add your character into the scene.
I hope that this answers your question. If it doesn't let me know.
From the level select scene:
let scene = GameScene(fileNamed:"GameScene")
scene?.userData = [:]
scene?.userData!["level"] = 21
self.view?.presentScene(scene!)
From within the game scene:
let level = self.userData!["level"] as! Int

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