change color of uiimageview in a empty array by pressing on it - swift

Question

My swift code below has a button and when touch places a imageview on the viewcontroller. The only thing I want to do is when a individual imageview not all of the imageview just the one select is touch I would like to change the color from purple to blue only if touched and one at a time.
import UIKit
class ViewController: UIViewController {
var count: Int = 0
var ht = -90
var ww = 80
var moveCounter = 0
var counter = 0
var arrTextFields = [UIImageView]()
var b7 = UIButton()
override func viewDidLoad() {
super.viewDidLoad()
[b7].forEach {
$0.translatesAutoresizingMaskIntoConstraints = false
view.addSubview($0)
$0.backgroundColor = .systemOrange
}
b7.frame = CGRect(x: view.center.x-115, y: view.center.y + 200, width: 70, height: 40)
b7.addTarget(self, action: #selector(addBOx), for: .touchUpInside)
}
//func that adds imageview.
#objc func addBOx() {
let subview = UIImageView()
subview.isUserInteractionEnabled = true
arrTextFields.append(subview)
view.addSubview(subview)
subview.frame = CGRect(x: view.bounds.midX - 0, y: view.bounds.midY + CGFloat(ht), width: CGFloat(ww), height: 35)
subview.backgroundColor = .purple
subview.tag = count
count += 1
ht += 50
arrTextFields.append(subview)
}}

Answer 1

You already set the isUserInteractionEnabled property of the image view to true. To respond to touch events, create a UITapGestureRecognizer and add it to the image view like so:
let gestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(imageViewTapped))
subview.addGestureRecognizer(gestureRecognizer)
Then inside of the imageViewTapped method you can extract the image view from the sender argument:
#objc func imageViewTapped(sender: UITapGestureRecognizer) {
if let imageView = sender.view as? UIImageView {
// Change the imageView's background here
}
}