let randomNumber = arc4random_uniform(2) let x: CGFloat = randomNumber == 0 ? 1 : -1 enemy.position = CGPoint(x: (CGFloat(arc4random_uniform(UInt32(UIScreen.main.bounds.width))) * x), y: UIScreen.main.bounds.height) here is my code for enemy spawn, it works but some of my enemies are spawning outside of my screen. What can i change to make them all spawn inside the border

How can i change my objects gravity without having my player fall with it. I added physicsWorld.gravity = CGVector(dx: 0, dy: 0) on my players movement and affectedByGravity on both my object and player. If I change dy to -9.8, my object falls but along with my player

Im getting a overridden error for my player and enemy. I made a enemy file and added this code into my gamescene. My enemy only spawns in if i delete my player movement code func spawnEnemy() {       let enemy = Enemy(image: SKSpriteNode(imageNamed: "enemy"))   self.addChild(enemy)   }       override func update(_ currentTime: TimeInterval) {     spawnEnemy()   }

I have the bare bones of an AUv3 plug in. I have used UIHostingController to allow me to add a SwiftUI view. Then from the SwiftUI I have added a SprikeKit scene which I want to use to start building an interface for the AU. It's a very basic GameScene for now. If I run one instance of it in Logic then it's OK. If I add another instance it crashes with a Thread 1: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) error. This seems to be down to how I declare a SpriteNode variable. If I declare it within the GameScene as a "let" then it's fine. If I declare it outside the class - (see hashed code) then it will crash with two instances. It would be useful to me later on for this to be a public variable as I want to perform functions on it outside of the class. Is there a better way to declare the SpriteNode variable to make it stable? import SpriteKit //public var ball = SKShapeNode(circleOfRadius: 30) var ball = SKShapeNode(circleOfRadius: 30) class GameScene: SKScene {         let ball = SKShapeNode(circleOfRadius: 30)     override func didMove(to view: SKView) {            //physicsBody = SKPhysicsBody(edgeLoopFrom: frame)         ball.position = CGPoint(x: 200, y: 200)         ball.fillColor = .lightGray         self.addChild(ball)          }

I deleted the grid on gamescene.sks and i dont know how to get it back. Now my game wont run

I am trying to use an EnvironmentObject in an init. I am aware that this is not possible because it hasn't been initialised yet. But what is the solution? I have tried loading the scene.gameCenterManger in .onAppear but that doesn't seem to work. I want to use @State for my gamescene variable, because SKScene will reset itself when the view does a refresh. struct GameSceneView: View {     @EnvironmentObject var gameCenterManager:GameCenterManager @State var scene = GameScene()     init() {   scene.size = CGSize(width: 1000, height: 1800)       scene.scaleMode = .aspectFill // doing it as below will throw an error. //scene.gameCenterManager = gameCenterManager     }     var body: some View {         SpriteView(scene: scene )             .environmentObject(gameCenterManager)             .frame(width: UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.height)             .ignoresSafeArea()             .overlay(ImageOverlay(), alignment: .bottomTrailing)            .onAppear{ scene.gameCenterManager = gameCenterManager  }     } }

When adding a particle emitter in SpriteKit, I want each particle to stay in the same spot instead of moving with the node the particle is coming off of. My node moves, and I want the particle to flow off of the back and float up (as a trail). Not to be stuck dragged behind the node. Any help? Im using swift in Xcode.

I have an SKSpriteNode with an SKAction being run on it: theGem!.run(premAction, completion: {theGem!.run(repeatAction)}) Can't seem to find out the proper steps to run another action, such as: theGem.run(endsequence, completion: {theGem.removeAllActions(); theGem.run(stopAction)}) Should I stop the previous action first? Is there a way to turn the repeat part off so that the first SKAction ends smoothly?

I have a label in a SpriteKit appvar speedLabel: SKLabelNode = SKLabelNode()And when I try to assign it a Font like so:speedLabel.fontName = UIFont.preferredFont(forTextStyle: .body).fontNameIn iOS 11.0-12.x, that returns ".SFUIText" and gives the label the proper san-serif system font.In iOS 13.0, it returns ".SFUI-Regular" and shows up as some serifed, maybe Times New Roman font.I remember having issues with SpriteKit Label Nodes and fonts in the past. If you assigned it an invalid font, it would default to this serifed font.Anyone have any ideas how to fix this?

Working from Apple documentation I wanted to apply the CIPixellate filter to a SpriteKit Node and found that SKEffectNode grants access to CoreGraphic's filters and could be a good bridge. I can get the image to pixelate, but I am looking for a smooth transition between the two stages and believe that I am having trouble with the "simd_smoothstep" function: let pixelateNode: SKEffectNode = SKEffectNode() let testSprite = SKSpriteNode(imageNamed: "testSprite") let filter = CIFilter(name: "CIPixellate")! let inputScale = simd_smoothstep(1, 0, abs(0.9)) let filter = CIFilter(name:"CIPixellate", parameters: [kCIInputImageKey: testSprite, kCIInputScaleKey: inputScale]) pixelateNode.filter = filter pixelateNode.shouldEnableEffects = true addChild(pixelateNode) pixelateNode.addChild(testSprite) ref: https://developer.apple.com/documentation/coreimage/customizing_image_transitions ref: https://developer.apple.com/documentation/coreimage/customizing_image_transitions nb. this is a repost in the SpriteKit forum. The old post can be removed: https://developer.apple.com/forums/thread/684687

Working from Apple documentation I wanted to apply the CIPixellate filter to a SpriteKit Node and found that SKEffectNode grants access to CoreGraphic's filters and could be a good bridge. I can get the image to pixelate, but I am looking for a smooth transition between the two stages and believe that I am having trouble with the "simd_smoothstep" function: let pixelateNode: SKEffectNode = SKEffectNode() let testSprite = SKSpriteNode(imageNamed: "testSprite") let filter = CIFilter(name: "CIPixellate")! let inputScale = simd_smoothstep(1, 0, abs(0.9)) let filter = CIFilter(name:"CIPixellate", parameters: [kCIInputImageKey: testSprite, kCIInputScaleKey: inputScale]) pixelateNode.filter = filter pixelateNode.shouldEnableEffects = true addChild(pixelateNode) pixelateNode.addChild(testSprite) ref: https://developer.apple.com/documentation/coreimage/customizing_image_transitions