how to add separate selectors/listeners to each buttons in StackView programmatically swift 4.2

Question

I've added buttons into uistackview programmatically with for loop but I want each button have it's own separate listeners and I can't think up a logic for it. I've tried to add a #selector but obviously they all call the same method.

    for imageName in imagesArray1{
        let imageButton: UIButton = {
            let button = UIButton()
            let myUIImage = UIImage(named: imageName as! String)
            button.setImage(myUIImage, for: .normal)
            button.contentMode = .scaleAspectFit
            button.tag = buttonTag
            buttonTag += 1
            button.addTarget(self, action: #selector(handleSelectedAvatar(_:)), for:.touchUpInside)
            button.translatesAutoresizingMaskIntoConstraints = false
            return button
        }()
        stackView1.addArrangedSubview(imageButton)
        imageButton.widthAnchor.constraint(equalTo: stackView1.widthAnchor, multiplier: 1/4).isActive = true
        imageButton.heightAnchor.constraint(equalToConstant: UIScreen.main.bounds.width/4).isActive = true
    }

Answer 1

There are 2 solutions.

1) Use single selector for all buttons:

button.tag = some_tag (Int)
button.addTarget(self, action: #selector(handleSelectedAvatar(_:)), for: .touchupInside)

handleSelectedAvatar implementation:

@objc func handleSelectedAvatar(_ sender: UIButton) {
    switch sender.tag {
    case 0: // Do something with UIButton with tag 0
    case ...
    }
}

2) Use array of selectors:

let selectors = [#selector(handleSelectedAvatar), ...]

Than set selectors for buttons:

button.addTarget(self, action: selectors[your_index], for: .touchupInside)

Answer 2

First of all, you should edit your question, just post the code and I'll edit it for you if you find it hard to indent or format it properly.

There are multiple ways I can think of to do what you wanna do. The easiest is to use the tag property of a button. This tag should help you out to access any object (or UIImage in your case) from your array of images. Assign the tag based on the current index of your loop, then each button would have a common selector method.

import UIKit

class ViewController: UIViewController {

    internal lazy var stackView: UIStackView = {
        let stackView = UIStackView(arrangedSubviews: [])
        stackView.axis = .vertical
        stackView.alignment = .fill
        stackView.distribution = .fillEqually
        stackView.spacing = 10
        return stackView
    }()

    override func viewDidLoad() {
        super.viewDidLoad()

        self.view.backgroundColor = .white

        // StackView Autolayout

        self.view.addSubview(self.stackView)
        self.stackView.translatesAutoresizingMaskIntoConstraints = false

        self.view.addConstraint(NSLayoutConstraint(item: self.stackView, attribute: .top, relatedBy: .equal, toItem: self.view, attribute: .top, multiplier: 1.0, constant: 100.0))
        self.view.addConstraint(NSLayoutConstraint(item: self.stackView, attribute: .leading, relatedBy: .equal, toItem: self.view, attribute: .leading, multiplier: 1.0, constant: 20.0))
        self.view.addConstraint(NSLayoutConstraint(item: self.stackView, attribute: .bottom, relatedBy: .equal, toItem: self.view, attribute: .bottom, multiplier: 1.0, constant: 20.0))

        // Add Buttons

        for index in 1...10 {
            let button = UIButton(type: .custom)
            button.backgroundColor = UIColor.gray
            button.setTitle("Button #\(index)", for: .normal)
            button.addTarget(self, action: #selector(self.buttonHandler(_:)), for: .touchUpInside)
            button.tag = index
            self.stackView.addArrangedSubview(button)
        }
    }

    @objc private func buttonHandler(_ button: UIButton) {
        print("Tapped button #:\(button.tag)")
    }
}

I hope this helps!