46 lines
1.0 KiB
Swift
46 lines
1.0 KiB
Swift
//
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// UnreadCountProtocol.swift
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// Evergreen
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//
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// Created by Brent Simmons on 4/8/16.
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// Copyright © 2016 Ranchero Software, LLC. All rights reserved.
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//
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import Foundation
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public extension Notification.Name {
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public static let UnreadCountDidChange = Notification.Name(rawValue: "UnreadCountDidChange")
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}
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public protocol UnreadCountProvider {
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var unreadCount: Int { get }
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func postUnreadCountDidChangeNotification()
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func calculateUnreadCount<T: Collection>(_ children: T) -> Int
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}
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public extension UnreadCountProvider {
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public func postUnreadCountDidChangeNotification() {
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NotificationCenter.default.post(name: .UnreadCountDidChange, object: self, userInfo: nil)
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}
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public func calculateUnreadCount<T: Collection>(_ children: T) -> Int {
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let updatedUnreadCount = children.reduce(0) { (result, oneChild) -> Int in
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if let oneUnreadCountProvider = oneChild as? UnreadCountProvider {
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return result + oneUnreadCountProvider.unreadCount
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}
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return result
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}
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return updatedUnreadCount
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}
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}
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