First version with app notifications

main/Extensions/AlertSheet.swift

@@ -37,6 +37,13 @@ func AskAlert(title: String?, text: String?, buttonText: String = "Continue", bu
 	return alert
 }
 
+/// Show alert hinting the user to go to system settings and re-enable notifications.
+func NotificationsDisabledAlert(presentIn viewController: UIViewController) {
+	Alert(title: "Notifications Disabled",
+		  text: "Go to System Settings > Notifications > AppCheck to re-enable notifications."
+	).presentIn(viewController)
+}
+
 // MARK: Alert with multiple options
 
 /// - Parameters:

main/Extensions/Time.swift

@@ -23,6 +23,8 @@ extension Timestamp {
 	static func minutes(_ m: Int) -> Timestamp { Timestamp(m * 60) }
 	/// Create `Timestamp` with `h * 3600` seconds
 	static func hours(_ h: Int) -> Timestamp { Timestamp(h * 3600) }
+	/// Create `Timestamp` with `d * 86400` seconds
+	static func days(_ d: Int) -> Timestamp { Timestamp(d * 86400) }
 }
 
 extension Timer {

main/Extensions/UNNotification.swift

@@ -0,0 +1,83 @@
+import UserNotifications
+
+enum NotificationRequestState {
+	case NotDetermined, Denied, Authorized, Provisional
+	@available(iOS 10.0, *)
+	init(_ from: UNAuthorizationStatus) {
+		switch from {
+		case .notDetermined: self = .NotDetermined
+		case .denied: self = .Denied
+		case .authorized: self = .Authorized
+		case .provisional: self = .Provisional
+		@unknown default: fatalError()
+		}
+	}
+}
+
+@available(iOS 10.0, *)
+extension UNNotificationRequest {
+	func push() {
+		UNUserNotificationCenter.current().add(self) { error in
+			if let e = error {
+				NSLog("[ERROR] Can't add push notification: \(e)")
+			}
+		}
+	}
+	func pushAndWait() {
+		let semaphore = DispatchSemaphore(value: 0)
+		UNUserNotificationCenter.current().add(self) { error in
+			if let e = error {
+				NSLog("[ERROR] Can't add push notification: \(e)")
+			}
+			semaphore.signal()
+		}
+		_ = semaphore.wait(wallTimeout: .distantFuture)
+	}
+}
+
+@available(iOS 10.0, *)
+extension UNNotificationContent {
+	/// - Parameter sound: Use `#default` or `nil`  to play the default tone. Use `#mute` to play no tone at all. Else use an `UNNotificationSoundName`.
+	static func make(_ title: String, body: String, sound: UNNotificationSound? = .default) -> UNNotificationContent {
+		let x = UNMutableNotificationContent()
+		// use NSString.localizedUserNotificationString(forKey:arguments:)
+		x.title = title
+		x.body = body
+		x.sound = sound
+		return x
+	}
+	/// - Parameter value: `0` will remove the badge
+	static func makeBadge(_ value: Int) -> UNNotificationContent {
+		let x = UNMutableNotificationContent()
+		x.badge = value as NSNumber?
+		return x
+	}
+}
+
+@available(iOS 10.0, *)
+extension UNNotificationTrigger {
+	/// Calls `(dateMatching: components, repeats: repeats)`
+	static func make(_ components: DateComponents, repeats: Bool) -> UNCalendarNotificationTrigger {
+		UNCalendarNotificationTrigger(dateMatching: components, repeats: repeats)
+	}
+	/// Calls `(dateMatching: components(second-year), repeats: false)`
+	static func make(_ date: Date) -> UNCalendarNotificationTrigger {
+		let components = Calendar.current.dateComponents([.year,.month,.day,.hour,.minute,.second], from: date)
+		return UNCalendarNotificationTrigger(dateMatching: components, repeats: false)
+	}
+	/// Calls `(timeInterval: time, repeats: repeats)`
+	static func make(_ time: TimeInterval, repeats: Bool) -> UNTimeIntervalNotificationTrigger {
+		UNTimeIntervalNotificationTrigger(timeInterval: time, repeats: repeats)
+	}
+}
+
+@available(iOS 10.0, *)
+extension UNNotificationSound {
+	static func from(string: String) -> UNNotificationSound? {
+		switch string {
+		case "#mute":    return nil
+		case "#default": return .default
+		case let name:   return .init(named: UNNotificationSoundName(name + ".caf"))
+		}
+	}
+}