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//
// AlertPresenter.swift
// MullvadVPN
//
// Created by pronebird on 04/06/2020.
// Copyright © 2020 Mullvad VPN AB. All rights reserved.
//
#if canImport(UIKit)
import UIKit
public final class AlertPresenter {
static let alertControllerDidDismissNotification = Notification
.Name("UIAlertControllerDidDismiss")
private let operationQueue: OperationQueue = {
let operationQueue = AsyncOperationQueue()
operationQueue.name = "AlertPresenterQueue"
operationQueue.maxConcurrentOperationCount = 1
return operationQueue
}()
private static let initClass: Void = {
/// Swizzle `viewDidDisappear` on `UIAlertController` in order to be able to
/// detect when the controller disappears.
/// The event is broadcasted via
/// `AlertPresenter.alertControllerDidDismissNotification` notification.
swizzleMethod(
aClass: UIAlertController.self,
originalSelector: #selector(UIAlertController.viewDidDisappear(_:)),
newSelector: #selector(UIAlertController.alertPresenter_viewDidDisappear(_:))
)
}()
public init() {
_ = Self.initClass
}
public func enqueue(
_ alertController: UIAlertController,
presentingController: UIViewController,
presentCompletion: (() -> Void)? = nil
) {
let operation = PresentAlertOperation(
alertController: alertController,
presentingController: presentingController,
presentCompletion: presentCompletion
)
operationQueue.addOperation(operation)
}
public func cancelAll() {
operationQueue.cancelAllOperations()
}
}
private extension UIAlertController {
@objc dynamic func alertPresenter_viewDidDisappear(_ animated: Bool) {
// Call super implementation
alertPresenter_viewDidDisappear(animated)
if presentingViewController == nil {
NotificationCenter.default.post(
name: AlertPresenter.alertControllerDidDismissNotification,
object: self
)
}
}
}
#endif
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