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//
// AlertPresenter.swift
// MullvadVPN
//
// Created by pronebird on 04/06/2020.
// Copyright © 2020 Mullvad VPN AB. All rights reserved.
//
import Foundation
import UIKit
class AlertPresenter {
static let alertControllerDidDismissNotification = Notification.Name("UIAlertControllerDidDismiss")
private let operationQueue: OperationQueue = {
let operationQueue = OperationQueue()
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(_:)))
}()
init() {
_ = Self.initClass
}
func enqueue(_ alertController: UIAlertController, presentingController: UIViewController, presentCompletion: (() -> Void)? = nil) {
let operation = PresentAlertOperation(
alertController: alertController,
presentingController: presentingController,
presentCompletion: presentCompletion
)
operationQueue.addOperation(operation)
}
func cancelAll() {
operationQueue.cancelAllOperations()
}
}
fileprivate 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)
}
}
}
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