Question

我这里有这样一条法典。我将如何写一下,以确定该项目是否已经通过? 因此,如果项目日期已经过去,则当地宣布火力。日期应为现在,加上86400(24小时)其他假期。

NSCalendar *calendar = [NSCalendar autoupdatingCurrentCalendar];
        NSDateComponents *dateComps = [[NSDateComponents alloc] init];
        [dateComps setDay:item.day];
        [dateComps setMonth:item.month];
        [dateComps setYear:item.year];
        [dateComps setHour:item.hour];
        [dateComps setMinute:item.minute];
        NSDate *itemDate = [calendar dateFromComponents:dateComps];
        [dateComps release];
        UILocalNotification *localNotif = [[UILocalNotification alloc] init];
        if (localNotif == nil)
            return;

        localNotif.fireDate = [itemDate dateByAddingTimeInterval:-(minutesBefore*60)] ;
            NSLog(@"fireDate is %@",localNotif.fireDate);

        localNotif.timeZone = [NSTimeZone defaultTimeZone];

Answer 1

You can retrieve the current date using [NSDate date].
NSDate has this really convenient method called laterDate: that compares a date with the receiver and returns which ever one is later.
You can see if two dates are equal using isEqual:

换言之:

NSDate * notificationDate = [localNotif fireDate];
NSDate * now = [NSDate date];

if ([[now laterDate:notificationDate] isEqual:now]) {
  //in a comparison between "now" and "notificationDate", "now" is the later date,
  //meaning "notificationDate" has already passed
  notificationDate = [notificationDate dateByAddingTimeInterval:86400];
}
[localNotif setFireDate:notificationDate];

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