只让本地通知出现一次 [英] Only let local notification appear once

问题描述

我有一个大问题！我的问题是，我已经在委托中实现了一个本地通知代码.我已将此代码放入didEnterBackround方法中.但是，对于每个didEnterBackround，我都会得到一个localnotifi.如果最近的通知失效，是否有可能仅启动新的通知触发日期?就像我有一个会在5天后触发的localnotifi一样.当我打开和关闭应用程序5次并等待5天时，我会收到5条本地通知.可以让该应用程序仅触发一次触发，然后在该触发之后出现一个新触发吗?！

I have a huge problem! My problem is, that I've implementet a localnotification code in my delegate. I've put in this code in didEnterBackround method. However, I get a localnotifi for each didEnterBackround. Is there a possible way that only a new notification firedate starts, if the latest was gone? Like if I have a localnotifi which fires after 5 days. When I open and close the app 5 times and wait 5 days I get 5 localnotifications. Is it possible to let the app make only one firedate and after this appears a new one gets startet?!

我的代码:

NSCalendar  *calender = [NSCalendar autoupdatingCurrentCalendar];
NSDate *currentDate = [NSDate date];

NSDateComponents *dateComponents = [calender components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit) fromDate:currentDate];

NSDateComponents *timeComponents = [calender components:(NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit) fromDate:currentDate];

NSDateComponents *temp = [[NSDateComponents alloc]init];

[temp setYear:[dateComponents year]];
[temp setMonth:[dateComponents month]];
[temp setDay:[dateComponents day]];
[temp setHour:[timeComponents hour]];
[temp setMinute:[timeComponents minute]];
[temp setSecond:[timeComponents second] +10];

NSDate *fireTime = [calender dateFromComponents:temp];


UILocalNotification *localN = [[UILocalNotification alloc]init];
localN.fireDate = fireTime;
localN.timeZone = [NSTimeZone defaultTimeZone];


localN.alertBody = @"BLA BLA BLA!";
localN.alertAction = @"GO BACK";


localN.applicationIconBadgeNumber = 1;


[[UIApplication sharedApplication] scheduleLocalNotification:localN];

推荐答案

您可以取消所有计划的通知:

You're able to cancel all scheduled notifications:

[[UIApplication sharedApplication] cancelAllLocalNotifications];

如果您不想删除所有计划的通知(也许您还有其他计划的通知)，请查看 cancelLocalNotification:，它仅允许您取消单个实例.

If you don't want to remove ALL scheduled notifications (perhaps you have something else scheduled), then take a look at cancelLocalNotification: which allows you to cancel only a single instance.

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