Logout delegate not working - ios

Question

I have an app that contains a central view controller with 3 child view controllers in a scrollview that represent sections of the app. General flow of my app goes as follows
LoginVC -> AppVC [Settings, Inbox, Email]
I currently have my logout button in my Settings view controller however the actual logout function needs to be in AppVC. I have tried implementing a delegate but cannot seem to get it working correctly
class Settings: UIViewController {
var delegate: LogoutDelegate?
#IBAction func logout(_ sender: Any) {
delegate?.logoutOfApp()
}
}
protocol LogoutDelegate: class {
func logoutOfApp()
}
----------------------------------
class AppVC: UIViewController, LogoutDelegate {
func logoutOfApp() {
print("This should be called")
//Execute logout code
}
}
Can anyone help me figure out why my delegate function isnt being called in my AppVC?
Update
This is how I set up my child view controllers in a scrollview
func setupViews() {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let settingsVC = storyboard.instantiateViewController(withIdentifier: "SettingsVC")
let inboxVC = storyboard.instantiateViewController(withIdentifier: "InboxVC")
let emailVC = storyboard.instantiateViewController(withIdentifier: "EmailVC")
let viewControllers = [settingsVC, inboxVC, emailVC]
let width = scrollView.bounds.width
let height = scrollView.bounds.height
scrollView.contentSize = CGSize(width: width * 3, height: height)
var idx = 0
for vc in viewControllers {
addChildViewController(vc)
let originX = CGFloat(idx) * width
vc.view.frame = CGRect(x: originX, y: 0, width: width, height: height)
scrollView.addSubview(vc.view)
vc.didMove(toParentViewController: self)
idx += 1
}
scrollView.setContentOffset(CGPoint(x: width, y: 0), animated: false)
}
I am not sure where to set my delegate. I have tried to set it inside my for loop self.delegate = vc but always get the same error of not being able to set the delegate

Answer 1

The problem is that you never set the delegate, otherwise the delegate will always be nil and delegate?.logoutOfApp() won't be executed.
In AppVC, you need to do something like:
override func viewDidLoad() {
super.viewDidLoad()
settings.delegate = self
}