KCD/PeriodicNotifier.swift

   1 //
   2 //  PeriodicNotifier.swift
   3 //  KCD
   4 //
   5 //  Created by Hori,Masaki on 2017/01/03.
   6 //  Copyright © 2017年 Hori,Masaki. All rights reserved.
   7 //
   8
   9 import Cocoa
  10
  11 extension Notification.Name {
  12     static let Periodic = Notification.Name("com.masakih.KCD.Notification.Periodic")
  13 }
  14
  15 fileprivate extension Selector {
  16     static let notifyIfNeeded = #selector(PeriodicNotifier.notifyIfNeeded(_:))
  17 }
  18
  19 class PeriodicNotifier: NSObject {
  20     private let hour: Int
  21     private let minutes: Int
  22
  23     init(hour: Int, minutes: Int) {
  24         self.hour = hour
  25         self.minutes = minutes
  26         super.init()
  27
  28         let nc = NotificationCenter.default
  29         nc.addObserver(forName: .NSSystemTimeZoneDidChange, object: nil, queue: nil, using: notify)
  30         nc.addObserver(forName: .NSSystemClockDidChange, object: nil, queue: nil, using: notify)
  31         nc.addObserver(forName: .NSWorkspaceDidWake, object: nil, queue: nil, using: notify)
  32
  33         notifyIfNeeded(nil)
  34     }
  35     deinit {
  36         NotificationCenter.default.removeObserver(self)
  37     }
  38
  39     private func notify(_ notification: Notification) {
  40         notifyIfNeeded(nil)
  41     }
  42
  43     @objc fileprivate func notifyIfNeeded(_ timer: Timer?) {
  44         let now = Date(timeIntervalSinceNow: 0.0)
  45         let unit: Set<Calendar.Component> = [.era, .year, .month, .day]
  46         var currentDay = Calendar.current.dateComponents(unit, from: now)
  47         currentDay.hour = hour
  48         currentDay.minute = minutes
  49         if let notifyDate = Calendar.current.date(from: currentDay),
  50             now.compare(notifyDate) == .orderedDescending {
  51             currentDay.day? += 1
  52             NotificationCenter.default.post(name: .Periodic, object: self)
  53         }
  54         if let v = timer?.isValid, v {
  55             timer?.invalidate()
  56         }
  57         guard let nextNotifyDate = Calendar.current.date(from: currentDay)
  58             else { fatalError("Can not create time of notify") }
  59         let nextNotifyTime = nextNotifyDate.timeIntervalSinceNow + 0.1
  60         Timer.scheduledTimer(timeInterval: nextNotifyTime,
  61                              target: self,
  62                              selector: .notifyIfNeeded,
  63                              userInfo: nil,
  64                              repeats: false)
  65     }
  66 }