Dissmiss completion block doesn't work. Swift - ios

Question

I have PhotoBrowser (it inherits from UIViewController) as a presentedViewController. I present it from UITableViewController. The PhotoBrowser presents actionMainController (it inherits from UIAlertController) when I tapped on button. I want to call another UIAlertController, when I select one of the actions in the actionMainController and display the second UIAlertController immediately after its dismissed but completion block doesn't work. I want to add that dismiss the actionMainController succeeds, it works
class PhotoBrowser: SKPhotoBrowser {
// MARK: - Controllers
private var actionMainController = UIAlertController()
// MARK: - Lifecycle
override func viewDidLoad() {
super.viewDidLoad()
}
// MARK: - override var
override var prefersStatusBarHidden: Bool {
return true
}
// MARK: - functions
func editAvatar() {
debugPrint("removePhoto")
actionMainController = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
actionMainController.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
let deleteAction = UIAlertAction(title: "Delete Photo", style: .destructive) { (action) in
self.deletePhoto()
}
let takePhoto = UIAlertAction(title: "Take Photo", style: .default) { (action) in
}
let choosePhoto = UIAlertAction(title: "Choose Photo", style: .default) { (action) in
}
actionMainController.addAction(deleteAction)
actionMainController.addAction(takePhoto)
actionMainController.addAction(choosePhoto)
present(actionMainController, animated: true, completion: nil)
}
private func deletePhoto() {
actionMainController.dismiss(animated: true) {
// TODO: it
// self.showDeleteActionSheet()
}
showDeleteActionSheet()
}
private func showDeleteActionSheet() {
let deleteActionController = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
deleteActionController.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
let deleteAction = UIAlertAction(title: "Delete Photo", style: .destructive) { (action) in
}
deleteActionController.addAction(deleteAction)
present(deleteActionController, animated: true, completion: nil)
}
}

Answer 1

Your completion handler is not called since your alert has already been dismissed and you are again trying to dismiss the alert.
actionMainController.dismiss(animated: true) {
self.showDeleteActionSheet()
}
Instead you should do some work on the completion handler of Action as
let deleteAction = UIAlertAction(title: "Delete Photo", style: .destructive) { (action) in
self.showDeleteActionSheet()
}