iOS:为什么没有添加我的循环规则？

Question

我正在创建带有警报的提醒。它们工作得很好。现在我想用下面的代码添加循环规则：

            EKRecurrenceFrequency frequency;
            int anzahl;

            unsigned unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit |  NSDayCalendarUnit;
            NSDate *now = [NSDate date];
            NSCalendar *gregorian = [NSCalendar currentCalendar];
            NSDateComponents *compsMax = [gregorian components:unitFlags fromDate:now];
            [compsMax setYear:[compsMax year] + 100];
            NSDate *hundredYearsLater = [gregorian dateFromComponents:compsMax];
            NSDate *endDate = hundredYearsLater;
            EKRecurrenceEnd *end = [EKRecurrenceEnd recurrenceEndWithEndDate:endDate];

            if ([_wiederholungCode isEqualToString:@"taeglich"]) {
                frequency = EKRecurrenceFrequencyDaily;
                anzahl = 1;
            } else if ([_wiederholungCode isEqualToString:@"monatlich"]) {
                frequency = EKRecurrenceFrequencyMonthly;
                anzahl = 1;
            } else if ([_wiederholungCode isEqualToString:@"vierteljaerlich"]) {
               frequency = EKRecurrenceFrequencyMonthly;
               anzahl = 3;
            } else if ([_wiederholungCode isEqualToString:@"halbjaerlich"]) {
                frequency = EKRecurrenceFrequencyMonthly;
                anzahl = 6;
            } else if ([_wiederholungCode isEqualToString:@"jaerlich"]) {
                frequency = EKRecurrenceFrequencyYearly;
                anzahl = 1;
            } else {
                frequency = EKRecurrenceFrequencyMonthly;
                anzahl = 1;
            }
            EKRecurrenceRule *rule = [[EKRecurrenceRule alloc] initRecurrenceWithFrequency:frequency interval:anzahl end:end];
           [reminder addRecurrenceRule:rule];
           NSLog(@"reminder.recurrenceRules: %@", reminder.recurrenceRules);

在日志中，直接在添加规则后添加规则：reminder.recurrenceRules: ( "EKRecurrenceRule <0x156b9bb0> RRULE FREQ=MONTHLY;INTERVAL=1;UNTIL=21140321T230000Z"，所以看起来规则是正确创建的，但是，它没有添加到规则数组中。

有人能帮我吗？

注意:提醒本身及其告警添加正确。

Answer 1

似乎循环规则也只有在提供日期的情况下才有效。所以我在我的提醒中添加了开始日期和到期日期，然后它就可以工作了(我没有测试是否只提供了开始日期或到期日期就可以了)