ios – How To Change Contents Of A CAEmitterCell In A CAEmitterLayer Particle Emitter

Background

I’ve a perform that creates a core animation emitter layer that animates myImage1, within the code under.

I wish to change myImage1 to myImage2 to myImage3 and again to myImage1 after a delay of 10 seconds or each time a button is tapped.

I’ve tried unsuccessfully. The code myEmitterChange() is executed however the picture doesn’t change within the core animation emitter layer. What must be corrected within the code under?

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Questions

1 – How do I modify the emitter layer picture as soon as the CAEmitterLayer is added to a view ?

2 – How do I fully cease the CAEmitterLayer animation and take away it fully from the view?

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Code

import UIKit

class ViewController: UIViewController {

var myEmitterLayer = CAEmitterLayer()
var myEmitterCell = CAEmitterCell()

override func viewDidLoad() {
    
    myEmitter()
    
    self.carry out(#selector(self.myEmitterChange), with: nil, afterDelay: 10)

}

@objc func myEmitterChange() {
    
    print("Did I Change?")
    
    myEmitterCell.colour = UIColor.orange.cgColor
    myEmitterCell.contents = UIImage(named: "myImage2")!.cgImage
    
}


func myEmitter() {
        
    myEmitterCell.birthRate = 1
    myEmitterCell.colour = UIColor.blue.cgColor
    myEmitterCell.contents = UIImage(named: "myImage1")!.cgImage
    myEmitterCell.lifetime = 15
    myEmitterCell.scale = 0.25
    myEmitterCell.scaleSpeed = 0.025
    myEmitterCell.velocity = 50
    myEmitterCell.velocityRange = 50
    myEmitterCell.spin = -2

    myEmitterLayer.beginTime = CACurrentMediaTime()
    myEmitterLayer.birthRate = 1
    myEmitterLayer.emitterMode = CAEmitterLayerEmitterMode.define
    myEmitterLayer.emitterPosition = CGPoint(x: (view.bounds.dimension.width * 0.5), y: (view.bounds.dimension.top * 0.5))
    myEmitterLayer.emitterShape = CAEmitterLayerEmitterShape.circle
    myEmitterLayer.emitterSize = CGSize(width: 10, top: 10)
    myEmitterLayer.renderMode = CAEmitterLayerRenderMode.oldestLast
    myEmitterLayer.emitterCells = [myEmitterCell]

    view.layer.addSublayer(myEmitterLayer)
    
    }

}