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//
// PresentAlertOperation.swift
// PresentAlertOperation
//
// Created by pronebird on 06/09/2021.
// Copyright © 2021 Mullvad VPN AB. All rights reserved.
//
import UIKit
class PresentAlertOperation: AsyncOperation {
private let alertController: UIAlertController
private let presentingController: UIViewController
private let presentCompletion: (() -> Void)?
init(alertController: UIAlertController, presentingController: UIViewController, presentCompletion: (() -> Void)? = nil) {
self.alertController = alertController
self.presentingController = presentingController
self.presentCompletion = presentCompletion
super.init()
}
override func cancel() {
DispatchQueue.main.async {
// Guard against executing cancellation more than once.
guard !self.isCancelled else { return }
// Call super implementation to toggle isCancelled flag
super.cancel()
// Guard against trying to dismiss the alert when operation hasn't started yet.
guard self.isExecuting else { return }
// Guard against dismissing controller during transition.
if !self.alertController.isBeingPresented && !self.alertController.isBeingDismissed {
self.dismissAndFinish()
}
}
}
override func main() {
DispatchQueue.main.async {
guard !self.isCancelled else {
self.finish()
return
}
NotificationCenter.default.addObserver(
self,
selector: #selector(self.alertControllerDidDismiss(_:)),
name: AlertPresenter.alertControllerDidDismissNotification,
object: self.alertController
)
self.presentingController.present(self.alertController, animated: true) {
self.presentCompletion?()
// Alert operation was cancelled during transition?
if self.isCancelled {
self.dismissAndFinish()
}
}
}
}
private func dismissAndFinish() {
NotificationCenter.default.removeObserver(
self,
name: AlertPresenter.alertControllerDidDismissNotification,
object: self.alertController
)
alertController.dismiss(animated: false) {
self.finish()
}
}
@objc private func alertControllerDidDismiss(_ note: Notification) {
finish()
}
}
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