Updating progress bar after user selects an item from array - swift

Question

I am trying to update the progress bar after the user selects the desired value.
Values are taken from model and assigned to the label:
let volumeArray = [20, 50, 100, 150, 200, 250, 300, 330, 350, 400, 450, 500, 600, 700, 800, 900, 1000, 1500, 2000]
Custom progress bar code:
let center = view.center
let trackLayer = CAShapeLayer()
let circularPath = UIBezierPath(arcCenter: center, radius: 100, startAngle: -CGFloat.pi / 2, endAngle: 1.5 * CGFloat.pi, clockwise: true)
trackLayer.path = circularPath.cgPath
trackLayer.strokeColor = UIColor.lightGray.cgColor
trackLayer.lineWidth = 10
trackLayer.fillColor = UIColor.clear.cgColor
trackLayer.lineCap = .round
view.layer.addSublayer(trackLayer)
shapeLayer.path = circularPath.cgPath
shapeLayer.strokeColor = UIColor.systemBlue.cgColor
shapeLayer.lineWidth = 10
shapeLayer.fillColor = UIColor.clear.cgColor
shapeLayer.lineCap = .round
shapeLayer.strokeEnd = 0
view.layer.addSublayer(shapeLayer)
But how can I make sure that the progress bar is updated when the user selects a value. For example, from an array let volumeArray = [20, 50, 100, 150, 200, 250, 300, 330, 350, 400, 450, 500, 600, 700, 800, 900, 1000, 1500, 2000]
But how can I make sure that the progress bar is updated when the user selects a value. For example, the user selected the number 100 from the array. The maximum value that the user must type, for example, is 2000. And based on the maximum value and the value selected by the user, the progress bar is updated by the corresponding percentage. I wrote a function
func updateProgress() {
if progressBar.progress != 1 {
progressBar.progress += Float(milileters2.volumeFromMilimetersVC / 10)
}
shapeLayer.strokeEnd = progress
}
But unfortunately, it does not work. I would be grateful for any help since I am still a beginner
UPD. Data is taken from another ViewController
var addDrinks = AddDrinksViewController()
var drinksToMainVC: [String] = []
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let vc = segue.destination as? MainViewController
vc?.delegate = self
vc?.addVolume(volumeFromMilimetersVC)
vc?.addedDrinksArray.append(contentsOf: drinksToMainVC)
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
volumeFromMilimetersVC = volume.volumeArray[row]
drinksToMainVC.append(drinks?.imageName ?? "nil")
}
Attached gif. As you can see, a value is selected from Picker View, which is then successfully written to the label, but the round progress bar is not updated.

Answer 1

In the function updateProgress, it is not shown where progress variable is getting updated. Progress variable can be updated as below.
let volumeArray = [20, 50, 100, 150, 200, 250, 300, 330, 350, 400, 450, 500, 600, 700, 800, 900, 1000, 1500, 2000]
let volumeMax = volumeArray.max()
//strokeEnd needs to be between 0 and 1, 2000 will correspond to 1 and others as a fraction of 1
let progress = CGFloat(milileters2.volumeFromMilimetersVC)/CGFloat(volumeMax!)
shapeLayer.strokeEnd = progress