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I'm trying to update the colour of an SKEmitterNode within a UIViewRepresentable. The hue value is passed in from the state on the parent View, and the emitter colour should update when the hue value in the parent state updates.It initially displays, and although it updates on the first call to updateUIView it does not respond to any subsequent calls, even though the function definitely gets called with the new value of hue each time.Has anyone any idea why the emitter won't update? I'm at the hair-tearing-out stage... I'd be grateful for any help with this.Here's what I've got. I just can't see what's wrong with this... I'm using the latest XCode GM Seed.import SwiftUI import UIKit import SpriteKit struct EmitterView: UIViewRepresentable { private let view = SKView() let scene = SKScene(fileNamed: "myScene")! var emitter: SKEmitterNode = SKEmitterNode() var hue: Double func makeUIView(context: UIViewRepresentableContext) -> SKView { // Lets make it manually emitter.particleTexture = SKTexture(imageNamed: "spark") emitter.particleBirthRate = 80 emitter.particleLifetime = 2.5 emitter.particlePositionRange = CGVector(dx: 200, dy: 150) emitter.emissionAngle = 90 emitter.emissionAngleRange = 360 emitter.particleRotation = CGFloat(Float(arc4random()) / Float(UINT32_MAX)) emitter.particleRotationSpeed = 0.5 emitter.particleSpeed = 0 emitter.particleSpeedRange = 40 emitter.particleAlpha = 0.8 emitter.particleAlphaRange = 0.2 emitter.particleAlphaSpeed = -0.4 emitter.particleScale = 0.2 emitter.particleScaleSpeed = 0.45 emitter.particleColor = SKColor.blue emitter.particleColorBlendFactor = 1.0 emitter.particleColorSequence = nil; scene.addChild(emitter) view.presentScene(scene) return view } func updateUIView(_ uiView: SKView, context: UIViewRepresentableContext) { let color: SKColor = SKColor( hue: CGFloat(hue), saturation: 1.0, brightness: 1.0, alpha: 1.0 ) print("Hue is now", hue) emitter.resetSimulation() emitter.particleColor = color } } struct EmitterView_Previews: PreviewProvider { static var previews: some View { EmitterView(hue: 0.5) } }