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
  13     static let Periodic = Notification.Name("com.masakih.KCD.Notification.Periodic")
  14 }
  15
  16 fileprivate extension Selector {
  17
  18     static let notifyIfNeeded = #selector(PeriodicNotifier.notifyIfNeeded(_:))
  19 }
  20
  21 final class PeriodicNotifier: NSObject {
  22
  23     private let hour: Int
  24     private let minutes: Int
  25
  26     init(hour: Int, minutes: Int) {
  27
  28         self.hour = hour
  29         self.minutes = minutes
  30
  31         super.init()
  32
  33         let nc = NotificationCenter.default
  34         nc.addObserver(forName: .NSSystemTimeZoneDidChange, object: nil, queue: nil, using: notify)
  35         nc.addObserver(forName: .NSSystemClockDidChange, object: nil, queue: nil, using: notify)
  36         nc.addObserver(forName: .NSWorkspaceDidWake, object: nil, queue: nil, using: notify)
  37
  38         notifyIfNeeded(nil)
  39     }
  40
  41     deinit {
  42
  43         NotificationCenter.default.removeObserver(self)
  44     }
  45
  46     private func notify(_ notification: Notification) {
  47
  48         notifyIfNeeded(nil)
  49     }
  50
  51     @objc fileprivate func notifyIfNeeded(_ timer: Timer?) {
  52
  53         let now = Date(timeIntervalSinceNow: 0.0)
  54         let unit: Set<Calendar.Component> = [.era, .year, .month, .day]
  55         var currentDay = Calendar.current.dateComponents(unit, from: now)
  56         currentDay.hour = hour
  57         currentDay.minute = minutes
  58
  59         if let notifyDate = Calendar.current.date(from: currentDay),
  60             now.compare(notifyDate) == .orderedDescending {
  61
  62             currentDay.day? += 1
  63             NotificationCenter.default.post(name: .Periodic, object: self)
  64         }
  65
  66         if let v = timer?.isValid, v {
  67
  68             timer?.invalidate()
  69         }
  70
  71         guard let nextNotifyDate = Calendar.current.date(from: currentDay)
  72             else { fatalError("Can not create time of notify") }
  73
  74         let nextNotifyTime = nextNotifyDate.timeIntervalSinceNow + 0.1
  75         Timer.scheduledTimer(timeInterval: nextNotifyTime,
  76                              target: self,
  77                              selector: .notifyIfNeeded,
  78                              userInfo: nil,
  79                              repeats: false)
  80     }
  81 }