每周在特定日期和时间触发通知

Posted 2023-02-24

【中文标题】每周在特定日期和时间触发通知

【英文标题】：Fire a notification at a specific day and time every week

【发布时间】：2013-11-21 01:34:57

【问题描述】：

我想在每周日晚上 8 点触发UILocalNotification，但是，我每天晚上 8 点都有开火日期。

NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    NSDate *now = [NSDate date];
    NSDateComponents *componentsForFireDate = [calendar components:(NSYearCalendarUnit |   NSHourCalendarUnit | NSMinuteCalendarUnit| NSSecondCalendarUnit | NSWeekdayCalendarUnit) fromDate: now];
    [componentsForFireDate setWeekday: 1] ; //for fixing Sunday
    [componentsForFireDate setHour: 20] ; //for fixing 8PM hour
    [componentsForFireDate setMinute:0] ;
    [componentsForFireDate setSecond:0] ;

    NSDate *fireDateOfNotification = [calendar dateFromComponents: componentsForFireDate];
    UILocalNotification *notification = [[UILocalNotification alloc]  init] ;
    notification.fireDate = fireDateOfNotification ;
    notification.timeZone = [NSTimeZone localTimeZone] ;
    notification.alertBody = [NSString stringWithFormat: @"New updates!"] ;
    notification.userInfo= [NSDictionary dictionaryWithObject:[NSString stringWithFormat:@"New updates added for that week!"] forKey:@"new"];
    notification.repeatInterval= NSDayCalendarUnit ;
    notification.soundName=UILocalNotificationDefaultSoundName;

    NSLog(@"notification: %@",notification);//it indicates that the notif will be triggered today at 8PM and not Sunday.

    [[UIApplication sharedApplication] scheduleLocalNotification:notification] ;

谢谢。

【问题讨论】：

试试这个 notification.repeatInterval = NSWeekCalendarUnit;

@Chany：它跳到下周（下周二），但不是在周日。这是我对NSWeekCalendarUnit 的看法：next fire date = Tuesday, November 26, 2013 at 8:00:00 PM

【参考方案1】：

您错过了 NSDateComponents 初始化函数中的 NSWeekCalendarUnit。将NSWeekCalendarUnit添加到其中并将repeatInterval设置为NSWeekCalendarUnit，则输出为

next fire date = Sunday, November 24, 2013 at 8:00:00 PM  

代码在这里：

  NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *now = [NSDate date];
NSDateComponents *componentsForFireDate = [calendar components:(NSYearCalendarUnit | NSWeekCalendarUnit |  NSHourCalendarUnit | NSMinuteCalendarUnit| NSSecondCalendarUnit | NSWeekdayCalendarUnit) fromDate: now];
[componentsForFireDate setWeekday: 1] ; //for fixing Sunday
[componentsForFireDate setHour: 20] ; //for fixing 8PM hour
[componentsForFireDate setMinute:0] ;
[componentsForFireDate setSecond:0] ;

  //...
  notification.repeatInterval = NSWeekCalendarUnit;
  //...

【讨论】：

非常感谢。没有你，我永远不会考虑。谢谢！

嗨@chancyWu，我需要在一周内再增加一天。对于前需要设置每周的星期一和星期二获取本地通知。我该怎么办？提前致谢

【参考方案2】：

我也搜索过。下面的代码对我有用。将工作日值 1 传递到 7 星期日到星期六，通知正文与您要触发的操作并指定您的日期，然后通知将在该特定日期出现。 设置日期时会自动设置时间。

希望对您有所帮助。

-(void) weekEndNotificationOnWeekday: (int)weekday :(UILocalNotification *)notification : (NSDate*) alramDate

    NSCalendar *calendar = [NSCalendar currentCalendar];

    NSDateComponents *componentsForFireDate = [calendar components:(NSYearCalendarUnit | NSWeekCalendarUnit |  NSHourCalendarUnit | NSMinuteCalendarUnit| NSSecondCalendarUnit | NSWeekdayCalendarUnit) fromDate: alramDate];
    [componentsForFireDate setWeekday: weekday] ; //for fixing Sunday
//    [componentsForFireDate setHour: 20] ; //for fixing 8PM hour
//    [componentsForFireDate setMinute:0] ;
//    [componentsForFireDate setSecond:0] ;
    notification.repeatInterval = NSWeekCalendarUnit;
    notification.fireDate=[calendar dateFromComponents:componentsForFireDate];
    [[UIApplication sharedApplication] scheduleLocalNotification:notification];

【讨论】：

如果我给 [componentsForFireDate setDate: -1];减一？