Adding different objects to CAEmitterLayer with forEach with SwiftUI - ios

Question

When I add more than one object, I have to write one by one as below. When I want to add 2 or more objects, I always have to copy and paste. I don't want that and I tried doing it with forLoop, but I only see whatever object was added last.
ForLoop
I wrote a function. ForLoop works as much as the number of images in the array.
func prepareParticeCell(particles: [String]) -> CAEmitterCell {
let particleCell = CAEmitterCell()
for particleItem in particles {
let particle = UIImage(named: particleItem)?.cgImage
particleCell.contents = particle
particleCell.name = "Square"
particleCell.birthRate = 5
particleCell.lifetime = 74.5
particleCell.velocityRange = 0.0
particleCell.velocity = 79.0
particleCell.xAcceleration = 0.0
particleCell.yAcceleration = 0.0
particleCell.emissionLatitude = 1*6.0 * (.pi / 180)
particleCell.emissionLongitude = -105.0 * (.pi / 180)
particleCell.emissionRange = 360.0 * (.pi / 180.0)
particleCell.spin = -65.6 * (.pi / 180.0)
particleCell.spinRange = 314.2 * (.pi / 180.0)
particleCell.scale = 0.043
particleCell.scaleRange = 0.7
particleCell.scaleSpeed = 0.02
particleCell.alphaRange = 0.0
particleCell.alphaSpeed = 0.47
particleCell.color = UIColor(red: 255.0/255.0, green: 255.0/255.0, blue: 255.0/255.0, alpha: 1.0).cgColor
}
return particleCell
}
Using Function
let host = UIView(frame: CGRect(x: 0.0, y: 0.0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height))
let particlesLayer = CAEmitterLayer()
particlesLayer.frame = CGRect(x: 0.0, y: 0.0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height)
host.layer.insertSublayer(particlesLayer, at: 0)
host.layer.masksToBounds = true
host.insetsLayoutMarginsFromSafeArea = false
particlesLayer.backgroundColor = .none
particlesLayer.emitterShape = .circle
particlesLayer.emitterPosition = CGPoint(x: 509.4, y: 707.7)
particlesLayer.emitterSize = CGSize(width: 1648.0, height: 1112.0)
particlesLayer.emitterMode = .outline
particlesLayer.renderMode = .backToFront
particlesLayer.emitterCells = [prepareParticeCell(particles: particleImages)] // here
return host

Answer 1

You have to return an array, I gave you 2 way for this issue, one with for another with map. Both working the same thing.
func prepareParticeCellV1(particles: [String]) -> [CAEmitterCell] {
var arrayParticleCell: [CAEmitterCell] = [CAEmitterCell]() // <<: Here
for particleItem in particles {
let particleCell: CAEmitterCell = CAEmitterCell()
particleCell.contents = UIImage(named: particleItem)?.cgImage
particleCell.name = "Square"
particleCell.birthRate = 5
particleCell.lifetime = 74.5
particleCell.velocityRange = 0.0
particleCell.velocity = 79.0
particleCell.xAcceleration = 0.0
particleCell.yAcceleration = 0.0
particleCell.emissionLatitude = 1*6.0 * (.pi / 180)
particleCell.emissionLongitude = -105.0 * (.pi / 180)
particleCell.emissionRange = 360.0 * (.pi / 180.0)
particleCell.spin = -65.6 * (.pi / 180.0)
particleCell.spinRange = 314.2 * (.pi / 180.0)
particleCell.scale = 0.043
particleCell.scaleRange = 0.7
particleCell.scaleSpeed = 0.02
particleCell.alphaRange = 0.0
particleCell.alphaSpeed = 0.47
particleCell.color = UIColor(red: 255.0/255.0, green: 255.0/255.0, blue: 255.0/255.0, alpha: 1.0).cgColor
arrayParticleCell.append(particleCell)
}
return arrayParticleCell
}
func prepareParticeCellV2(particles: [String]) -> [CAEmitterCell] {
return particles.map({ item in
let particleCell: CAEmitterCell = CAEmitterCell()
particleCell.contents = UIImage(named: item)?.cgImage
particleCell.name = "Square"
particleCell.birthRate = 5
particleCell.lifetime = 74.5
particleCell.velocityRange = 0.0
particleCell.velocity = 79.0
particleCell.xAcceleration = 0.0
particleCell.yAcceleration = 0.0
particleCell.emissionLatitude = 1*6.0 * (.pi / 180)
particleCell.emissionLongitude = -105.0 * (.pi / 180)
particleCell.emissionRange = 360.0 * (.pi / 180.0)
particleCell.spin = -65.6 * (.pi / 180.0)
particleCell.spinRange = 314.2 * (.pi / 180.0)
particleCell.scale = 0.043
particleCell.scaleRange = 0.7
particleCell.scaleSpeed = 0.02
particleCell.alphaRange = 0.0
particleCell.alphaSpeed = 0.47
particleCell.color = UIColor(red: 255.0/255.0, green: 255.0/255.0, blue: 255.0/255.0, alpha: 1.0).cgColor
return particleCell
})
}