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//
// PresentAlertOperation.swift
// PresentAlertOperation
//
// Created by pronebird on 06/09/2021.
// Copyright © 2021 Mullvad VPN AB. All rights reserved.
//
#if canImport(UIKit)
import UIKit
public final class PresentAlertOperation: AsyncOperation {
private let alertController: UIAlertController
private let presentingController: UIViewController
private let presentCompletion: (() -> Void)?
public init(
alertController: UIAlertController,
presentingController: UIViewController,
presentCompletion: (() -> Void)? = nil
) {
self.alertController = alertController
self.presentingController = presentingController
self.presentCompletion = presentCompletion
super.init(dispatchQueue: .main)
}
override public func operationDidCancel() {
// Guard against trying to dismiss the alert when operation hasn't started yet.
guard isExecuting else { return }
// Guard against dismissing controller during transition.
if !alertController.isBeingPresented, !alertController.isBeingDismissed {
dismissAndFinish()
}
}
override public func main() {
NotificationCenter.default.addObserver(
self,
selector: #selector(alertControllerDidDismiss(_:)),
name: AlertPresenter.alertControllerDidDismissNotification,
object: alertController
)
presentingController.present(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: alertController
)
alertController.dismiss(animated: false) {
self.finish()
}
}
@objc private func alertControllerDidDismiss(_ note: Notification) {
finish()
}
}
#endif
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