Question

我陷入了一个谓词

我需要获取在给定时段内发生的事件数组。 如果给定日期是7月份.i.e。 7月1日至31日..然后我需要event1，事件2，事件3，事件5，事件6

所以我有事件startDate和endDate

Event 1 - June 10 - July 14
Event 2 - July 4
Event 3 - July 7
Event 4 - June 9
Event 5 - July 1-July 3
Event 6 - May 1 - Dec 10

我试过以下但它只会返回event2，event3

[NSPredicate predicateWithFormat:[NSString stringWithFormat:@"%@ >= %%@ AND %@ < %%@", @"startTime", @"endTime"], startDate, endDate]

Answer 1

试试这个

 NSDate *now = [NSDate date];
NSInteger month = 7; // given month 

NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:now];
[components setDay:0];
[components setMonth:month];

NSDateComponents *components1 = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:now];
[components1 setDay:31];
[components1 setMonth:month];

NSDate *startDate = [calendar dateFromComponents:components];
NSDate *endDate = [calendar dateFromComponents:components1];

NSPredicate* pred = [NSPredicate predicateWithFormat:@"(date >= %@) AND (date =< %@)", startDate, endDate];
NSArray* filteredArray = [yourarray filteredArrayUsingPredicate:pred];  // your array

NSPredicate在给定范围内的多日事件

1 个答案: