每 30 分钟重复间隔有问题

发布于 2025-01-02 22:12:15 字数 476 浏览 1 评论 0原文

我试图每 30 分钟重复一次本地通知，但我的代码无法正常工作...如果您帮助我并找到解决方案，我将不胜感激，这是我的代码：

UILocalNotification *reminderNote = [[UILocalNotification alloc]init];
reminderNote.fireDate = [NSDate dateWithTimeIntervalSinceNow:60 * 30];
reminderNote.repeatInterval = NSHourCalendarUnit;
reminderNote.alertBody = @"some text";
reminderNote.alertAction = @"View";
reminderNote.soundName = @"sound.aif";
[[UIApplication sharedApplication] scheduleLocalNotification:reminderNote];

原文

I am trying to repeat a local notification every 30 minutes but my code does not work fine ... I would be grateful if you help me and find the solution , here is my code :

UILocalNotification *reminderNote = [[UILocalNotification alloc]init];
reminderNote.fireDate = [NSDate dateWithTimeIntervalSinceNow:60 * 30];
reminderNote.repeatInterval = NSHourCalendarUnit;
reminderNote.alertBody = @"some text";
reminderNote.alertAction = @"View";
reminderNote.soundName = @"sound.aif";
[[UIApplication sharedApplication] scheduleLocalNotification:reminderNote];

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筑梦 2025-01-09 22:12:15

firedate 设置通知第一次触发的时间，repeatInterval 是通知重复之间的时间间隔。因此，问题中的代码安排从现在起 30 分钟（60 * 30 秒）后触发通知，然后每小时重复一次。

不幸的是，您只能安排通知以 NSCalendar 定义的精确时间间隔重复常量：例如，每分钟、每小时，每天、每月，但不是这些时间间隔的倍数。

幸运的是，要每 30 分钟收到一次通知，您只需安排两个通知：一个立即通知，一个 30 分钟后通知，并且每小时重复一次。就像这样：

UILocalNotification *reminderNote = [[UILocalNotification alloc]init];
reminderNote.fireDate = [NSDate dateWithTimeIntervalSinceNow:60 * 30];
reminderNote.repeatInterval = NSHourCalendarUnit;
reminderNote.alertBody = @"some text";
reminderNote.alertAction = @"View";
reminderNote.soundName = @"sound.aif";
[[UIApplication sharedApplication] scheduleLocalNotification:reminderNote];

reminderNote.fireDate = [NSDate dateWithTimeIntervalSinceNow:60 * 60];
[[UIApplication sharedApplication] scheduleLocalNotification:reminderNote];

firedate sets the time that the notification fires the first time, and repeatInterval is the interval between between repetitions of the notification. So the code in the question schedules a notification to fire 30 minutes (60 * 30 seconds) from now, and then repeat every hour.

Unfortunately, you can only schedule notifications to repeat at exact intervals defined by NSCalendar constants: e.g., every minute, every hour, every day, every month, but not at multiples of those intervals.

Luckily, to get a notification every 30 minutes, you can just schedule two notifications: one right now, one 30 minutes from now, and have both repeat every hour. Like so:

UILocalNotification *reminderNote = [[UILocalNotification alloc]init];
reminderNote.fireDate = [NSDate dateWithTimeIntervalSinceNow:60 * 30];
reminderNote.repeatInterval = NSHourCalendarUnit;
reminderNote.alertBody = @"some text";
reminderNote.alertAction = @"View";
reminderNote.soundName = @"sound.aif";
[[UIApplication sharedApplication] scheduleLocalNotification:reminderNote];

reminderNote.fireDate = [NSDate dateWithTimeIntervalSinceNow:60 * 60];
[[UIApplication sharedApplication] scheduleLocalNotification:reminderNote];

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