如何在每隔一天或每隔一天安排一次 UILocalNotification？答案

【问题标题】：How to schedule UILocalNotification at Every Other Day or Every Third Day?如何在每隔一天或每隔一天安排一次 UILocalNotification？
【发布时间】：2013-10-11 10:28:17
【问题描述】：

我每天上午 10:00 在我的应用程序中安排 UILocalNotification。

我为此使用了以下代码

 NSCalendar *calendar = [NSCalendar autoupdatingCurrentCalendar] ;

NSDateComponents *componentsForReferenceDate =

[calendar components:(NSDayCalendarUnit | NSYearCalendarUnit | NSMonthCalendarUnit ) fromDate:[NSDate date]];

[componentsForReferenceDate setDay:10] ;
[componentsForReferenceDate setMonth:10] ;
[componentsForReferenceDate setYear:2013] ;

NSDate *referenceDate = [calendar dateFromComponents:componentsForReferenceDate] ;

// set components for time 10:00 a.m.

NSDateComponents *componentsForFireDate =

[calendar components:(NSYearCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit| NSSecondCalendarUnit ) fromDate: referenceDate];

[componentsForFireDate setHour:10] ;
[componentsForFireDate setMinute:0] ;
[componentsForFireDate setSecond:0] ;

NSDate *fireDateOfNotification = [calendar dateFromComponents: componentsForFireDate];

// Create the notification

UILocalNotification *notification = [[UILocalNotification alloc]  init] ;

notification.fireDate = fireDateOfNotification ;
notification.timeZone = [NSTimeZone localTimeZone] ;
notification.alertBody = [NSString stringWithFormat: @"Good Morning! Have a great day!"] ;
notification.alertAction = @"go back";
notification.userInfo= [NSDictionary dictionaryWithObject:[NSString stringWithFormat:@"Some information"] forKey:@"information"];
notification.repeatInterval = NSDayCalendarUnit ;
notification.soundName = UILocalNotificationDefaultSoundName;
notification.applicationIconBadgeNumber = [[UIApplication sharedApplication] applicationIconBadgeNumber] + 1;
[[UIApplication sharedApplication] scheduleLocalNotification:notification] ;

效果很好。但现在我想每隔一天和每隔三天安排一次 UILocalNotification 。那么该怎么做呢？

【问题讨论】：

看看stackoverflow.com/questions/18014438/…

标签： iphone ios objective-c notifications uilocalnotification

【解决方案1】：

你不能自定义 UILocalNotification 的 repeatTimeInterval .. 有很多问题和你的一样，前几天我也有同样的问题，但我找不到任何解决方案，所以最好停止与之抗争。

您必须使用重复时间间隔

日历单位指定日历单位，例如日和月。

enum {
   NSEraCalendarUnit = kCFCalendarUnitEra,
   NSYearCalendarUnit = kCFCalendarUnitYear,
   NSMonthCalendarUnit = kCFCalendarUnitMonth,
   NSDayCalendarUnit = kCFCalendarUnitDay,
   NSHourCalendarUnit = kCFCalendarUnitHour,
   NSMinuteCalendarUnit = kCFCalendarUnitMinute,
   NSSecondCalendarUnit = kCFCalendarUnitSecond,
   NSWeekCalendarUnit = kCFCalendarUnitWeek,
   NSWeekdayCalendarUnit = kCFCalendarUnitWeekday,
   NSWeekdayOrdinalCalendarUnit = kCFCalendarUnitWeekdayOrdinal,
   NSQuarterCalendarUnit = kCFCalendarUnitQuarter,
   NSWeekOfMonthCalendarUnit = kCFCalendarUnitWeekOfMonth,
   NSWeekOfYearCalendarUnit = kCFCalendarUnitWeekOfYear,
   NSYearForWeekOfYearCalendarUnit = kCFCalendarUnitYearForWeekOfYear
   NSCalendarCalendarUnit = (1 << 20),
   NSTimeZoneCalendarUnit = (1 << 21),
};
typedef NSUInteger NSCalendarUnit;

您可以从 Apple 的文档中找到以上内容。也读过这个问题...

How to set Local Notification repeat interval to custom time interval?

有关更多信息，您只安排了本地通知的最大值 64，所以如果您有计划，要为自定义重复时间间隔创建多个通知，请小心。

【讨论】：

【解决方案2】：

您不能简单地使用repeatInterval 做到这一点，因为只有the following 间隔可用。

我能想到的解决方案之一是为每天设置单独的通知（不带repeatInterval）。但是通过这种方式，您可能会遇到 64 个通知的限制。

【讨论】：