ios - 如何在 iOS (ObjC) 中安排每日本地推送通知？

Question

无法以正确的方式安排每日本地 PushNotification。我只想在上午 9:00 显示一个每日本地 PushNotification，其中包含今天的计数任务。

我的代码只在 didFinishLaunchingWithOptions 中执行一次，例如:

- (void)scheduleLocalNotification
{
    self.localNotification = [UILocalNotification new];

    unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth |  NSCalendarUnitDay;
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *components = [calendar components:unitFlags fromDate:[NSDate date]];
    components.hour = 9;
    components.minute = 0;
    components.second = 0;
    NSDate *fireTime = [calendar dateFromComponents:components];

    _localNotification.fireDate = fireTime;
    _localNotification.alertBody = [NSString stringWithFormat:@"Hi, <username>. You have %ld tasks for today", (long)_todayTasks];
    _localNotification.repeatInterval = NSCalendarUnitDay;
    _localNotification.soundName = @"alarm.wav";
    _localNotification.timeZone = [NSTimeZone localTimeZone];

    [[UIApplication sharedApplication] scheduleLocalNotification:_localNotification];

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"HH:mm"];
    NotificationManagerLog(@"schedule local notification at %@", [dateFormatter stringFromDate:fireTime]);
}

看起来我错过了什么，因为它真的是在 9:00 触发的，但是 _todayTasks 中的数据错误，也可以随机触发其他 _todayTasks 值和随机重复几次。

Answer 1

一步一步:

1. 注册通知:

   - (void)prepareLocalNotification
       {
       if ([[UIApplication sharedApplication] respondsToSelector:@selector(registerUserNotificationSettings:)]) {
           UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeBadge | UIUserNotificationTypeSound | UIUserNotificationTypeAlert categories:nil];
           [[UIApplication sharedApplication] registerUserNotificationSettings:settings];
       } else  {
           UIRemoteNotificationType myTypes = UIRemoteNotificationTypeBadge | UIUserNotificationTypeSound | UIUserNotificationTypeAlert;
           [[UIApplication sharedApplication] registerForRemoteNotificationTypes:myTypes];
       }
   }
   

2. 如果用户允许本地通知(例如每天下午 3 点)，则创建通知:

   - (void)createDailyBasisNotification
   {
       [[UIApplication sharedApplication] cancelAllLocalNotifications];
       UILocalNotification *next3pm = [self notificationForTime:15 withMessage:<NotificationMessage3PM> soundName:UILocalNotificationDefaultSoundName];
   
       [[UIApplication sharedApplication] scheduleLocalNotification:next3pm];
   }
   
   - (UILocalNotification *)notificationForTime:(NSInteger)time withMessage:(NSString *)message soundName:(NSString *)soundName
   {
       UILocalNotification *localNotification = [[UILocalNotification alloc] init];
       localNotification.alertBody = message;
       localNotification.repeatInterval = NSDayCalendarUnit;
       localNotification.timeZone = [NSTimeZone localTimeZone];
       localNotification.soundName = soundName;
   
       NSDate *date = [NSDate date];
       NSCalendar *calendar = [NSCalendar currentCalendar];
       NSDateComponents *dateComponents = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:date];
   
       [dateComponents setHour:time];
   
       NSDate *next = [calendar dateFromComponents:dateComponents];
       if ([next timeIntervalSinceNow] < 0) {
           next = [next dateByAddingTimeInterval:60*60*24];
       }
       localNotification.fireDate = next;
   
       return  localNotification;
   }
   

另外不要忘记调用 [[UIApplication sharedApplication] cancelAllLocalNotifications]; - 这将清除所有通知，您将删除所有 random 通知