如何在iOS(ObjC)中安排每日本地推送通知? [英] How to schedule daily local push notification in iOS (ObjC)?

问题描述

不能以正确的方式安排每日本地PushNotification. 我只想在上午9:00每天只显示一个本地PushNotification，其中包含今天的计数任务.

Can't schedule daily local PushNotification in correct way. I want to show only one daily local PushNotification at 9:00 AM with counted tasks for today.

我的代码仅在didFinishLaunchingWithOptions中执行一次，例如:

My code executed only once in didFinishLaunchingWithOptions like:

- (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]);
}

好像我错过了一些事情，因为它确实是在9:00触发的，但是_todayTasks中的数据有误，也可以用其他_todayTasks值随机触发它，并在随机时间重复几次.

Looks like I miss something, because it's really triggered at 9:00, but with wrong data in _todayTasks, also it can be randomly triggered with other _todayTasks values and repeated few times at random time.

推荐答案

分步操作:

1. 注册通知:

1. Register notifications:

- (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];
    }
}

如果用户允许本地通知(例如每天下午3点)，则创建通知:

Create notification if user allow local Notifications (example 3pm every day):

- (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;
}

也别忘了打电话给[[UIApplication sharedApplication] cancelAllLocalNotifications];-这将清除所有通知，而您将删除所有random通知

Also don't forget to call [[UIApplication sharedApplication] cancelAllLocalNotifications]; - this will clean up all notification and u will remove all random notifications

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