Buttons Programmatically on Swift 4 - swift

Question

A quick question, I am trying to create a function called setupHeader() in which when called, setups up all the views and buttons of the header. The problem is with the Log Out button, for some reason I cannot get it right.
The first error is that the addTarget of the button doesn't recognize "self". Any suggestions?
The second one is that the #selector only works with the #objc func and the function cannot be in the main setupHeader function. Where should I put it? here is a snippet of my code:
import Foundation
import UIKit
func setupHeader(vc: UIViewController) {
let headerFiller: UIView = {
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = false
view.backgroundColor = supaGray
return view
}()
let header: UIView = {
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = false
view.backgroundColor = supaGray
return view
}()
let logOutButton: UIButton = {
let button = UIButton()
button.translatesAutoresizingMaskIntoConstraints = false
button.setTitle("Log Out", for: .normal)
button.setTitleColor(.blue, for: .normal)
button.titleLabel?.adjustsFontSizeToFitWidth = true
button.titleLabel?.textAlignment = .left
button.addTarget(self, action: #selector(handleLogOutButton), for: .touchUpInside)
return button
}()
func handleLogOutButton() {
}
vc.view.addSubview(header)
header.topAnchor.constraint(equalTo: vc.view.safeAreaLayoutGuide.topAnchor).isActive = true
header.leftAnchor.constraint(equalTo: vc.view.leftAnchor).isActive = true
header.rightAnchor.constraint(equalTo: vc.view.rightAnchor).isActive = true
header.heightAnchor.constraint(equalToConstant: 40).isActive = true
header.addSubview(logOutButton)
logOutButton.centerYAnchor.constraint(equalTo: header.centerYAnchor, constant: -5).isActive = true
logOutButton.leftAnchor.constraint(equalTo: header.leftAnchor, constant: 7).isActive = true
logOutButton.widthAnchor.constraint(equalTo: header.widthAnchor, multiplier: 0.17).isActive = true
logOutButton.heightAnchor.constraint(equalToConstant: 40).isActive = true
vc.view.addSubview(headerFiller)
headerFiller.topAnchor.constraint(equalTo: vc.view.topAnchor).isActive = true
headerFiller.leftAnchor.constraint(equalTo: vc.view.leftAnchor).isActive = true
headerFiller.rightAnchor.constraint(equalTo: vc.view.rightAnchor).isActive = true
headerFiller.bottomAnchor.constraint(equalTo: header.topAnchor).isActive = true
}

Answer 1

Declare your button press callback this way.
#objc func handleLogOutButton() {
}
And For self error use vc as your passing as argument above in function.

Answer 2

It looks like you're passing a view controller into your function so using self won't work. Try using 'vc'

Answer 3

Pretty straight forward:
Modify your code as shown below:
lazy var logOutButton: UIButton = {
let button = UIButton()
button.translatesAutoresizingMaskIntoConstraints = false
button.setTitle("Log Out", for: .normal)
button.setTitleColor(.blue, for: .normal)
button.titleLabel?.adjustsFontSizeToFitWidth = true
button.titleLabel?.textAlignment = .left
button.addTarget(self, action: #selector(handleLogOutButton), for: .touchUpInside)
return button
}()
#objc func handleLogOutButton() {
// Do your things here
}