KCD/HMPeriodicNotifier.m

   1 //
   2 //  HMPeriodicNotifier.m
   3 //  KCD
   4 //
   5 //  Created by Hori,Masaki on 2015/06/13.
   6 //  Copyright (c) 2015年 Hori,Masaki. All rights reserved.
   7 //
   8
   9 #import "HMPeriodicNotifier.h"
  10
  11
  12 NSString *HMPeriodicNotification = @"HMPeriodicNotification";
  13
  14 @interface HMPeriodicNotifier ()
  15 @property NSUInteger hour;
  16 @property NSUInteger minutes;
  17
  18 @property (strong, nonatomic) NSDateComponents *currentDay;
  19 @property (strong, nonatomic) NSTimer *timer;
  20 @end
  21
  22 @implementation HMPeriodicNotifier
  23
  24 + (instancetype)periodicNotifierWithHour:(NSUInteger)hour minutes:(NSUInteger)minutes
  25 {
  26         return [[self alloc] initWithHour:hour minutes:minutes];
  27 }
  28 - (instancetype)initWithHour:(NSUInteger)hour minutes:(NSUInteger)minutes
  29 {
  30         self = [super init];
  31         if(self) {
  32                 _hour = hour;
  33                 _minutes = minutes;
  34                 [self registerNotifications];
  35                 [self notifyIfNeeded:nil];
  36         }
  37         return self;
  38 }
  39
  40 - (void)registerNotifications
  41 {
  42         NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
  43
  44         [nc addObserver:self
  45                    selector:@selector(notifyIfNeeded:)
  46                            name:NSSystemTimeZoneDidChangeNotification
  47                          object:nil];
  48         [nc addObserver:self
  49                    selector:@selector(notifyIfNeeded:)
  50                            name:NSSystemClockDidChangeNotification
  51                          object:nil];
  52         [nc addObserver:self
  53                    selector:@selector(notifyIfNeeded:)
  54                            name:NSWorkspaceDidWakeNotification
  55                          object:nil];
  56 }
  57
  58 - (void)notifyIfNeeded:(id)timer
  59 {
  60         NSDate *now = [NSDate dateWithTimeIntervalSinceNow:0.0];
  61         NSCalendarUnit unit = NSCalendarUnitEra | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay;
  62         NSDateComponents *currentDay = [[NSCalendar currentCalendar] components:unit fromDate:now];
  63         currentDay.hour = self.hour;
  64         currentDay.minute = self.minutes;
  65         NSDate *notifyDate = [[NSCalendar currentCalendar] dateFromComponents:currentDay];
  66
  67         if([now compare:notifyDate] == NSOrderedDescending) {
  68                 currentDay.day += 1;
  69                 [[NSNotificationCenter defaultCenter] postNotificationName:HMPeriodicNotification
  70                                                                                                                         object:self];
  71         }
  72
  73         if(self.timer.valid) {
  74                 [self.timer invalidate];
  75         }
  76
  77         NSDate *nextNotifyDate = [[NSCalendar currentCalendar] dateFromComponents:currentDay];
  78         NSTimeInterval nextNotifyTime = [nextNotifyDate timeIntervalSinceNow];
  79
  80         self.timer = [NSTimer scheduledTimerWithTimeInterval:nextNotifyTime + 0.1
  81                                                                                                   target:self
  82                                                                                                 selector:_cmd
  83                                                                                                 userInfo:nil
  84                                                                                                  repeats:NO];
  85 }
  86
  87 @end