97 lines
3.5 KiB
Swift
97 lines
3.5 KiB
Swift
//
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// AlertHandler.swift
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// MVMCore
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//
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// Created by Scott Pfeil on 4/10/23.
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// Copyright © 2023 myverizon. All rights reserved.
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//
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import MVMCore
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public class AlertHandler {
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/// Returns the handler stored in the CoreUIObject
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public static func shared() -> Self {
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return MVMCoreActionUtility.fatalClassCheck(object: CoreUIObject.sharedInstance()?.alertHandler)
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}
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/// The operation queue of alert operations.
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private var queue = {
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let queue = OperationQueue()
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queue.maxConcurrentOperationCount = 1
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return queue
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}()
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public init() {}
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/// Returns if an alert is currently showing in the hierarchy, even if it is not the top presented view.
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public func isAlertShowing() -> Bool {
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return queue.operations.contains(where: { operation in
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return !operation.isCancelled &&
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!operation.isFinished &&
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operation.isExecuting
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})
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}
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/// Returns if a greedy alert is currently showing in the hierarchy, even if it is not the top presented view.
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public func isGreedyAlertShowing() -> Bool {
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return queue.operations.contains(where: { operation in
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return !operation.isCancelled &&
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!operation.isFinished &&
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operation.isExecuting &&
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(operation as? AlertOperation)?.alertObject.isGreedy ?? false
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})
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}
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@MainActor
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public func createAlertController(with alertModel: AlertModelProtocol) -> AlertController {
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// ActionSheets are not supported on iPad interfaces without a source rect (i.e. a source element) which isn't currently supported for our generic handling.
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// TODO: Find a way to support this.
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var alertStyle = alertModel.preferredStyle
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if alertStyle == .actionSheet, UIDevice.current.userInterfaceIdiom != .phone {
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alertStyle = .alert
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}
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// Create the alert. Adds the actions one by one.
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let alertController = AlertController(title: alertModel.title, message: alertModel.message, preferredStyle: alertStyle)
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for action in alertModel.actions {
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alertController.addAction(action)
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}
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if let index = alertModel.preferredActionIndex {
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alertController.preferredAction = alertModel.actions[index]
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}
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return alertController
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}
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/// Shows an alert using the alert object.
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@MainActor
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public func queueAlertToShow(with alertObject: AlertObject) -> UIAlertController {
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// It's a greedy alert! Clear all alerts that are queued up and the one that is showing
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if alertObject.isGreedy {
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removeAllAlertViews()
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}
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let alertController = createAlertController(with: alertObject.alertModel)
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let alertOperation = AlertOperation(with: alertController, alertObject: alertObject)
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queue.addOperation(alertOperation)
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return alertController
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}
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/** Iterates through all scheduled alerts and cancels any that match the provided predicate.
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* @param predicate The predicate block to decide whether to cancel an alert.
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*/
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public func cancelAlert(using predicate: ((AlertObject) -> Bool)) {
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for case let operation as AlertOperation in queue.operations {
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if predicate(operation.alertObject) {
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operation.cancel()
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}
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}
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}
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/// Cancels all current alerts
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public func removeAllAlertViews() {
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queue.cancelAllOperations()
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}
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}
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