
- (nspredicate *)matchAttribute:(Nsstring *)attributename withDate:(NSDate *)date{ NSDateComponents *components = [[NSCalendar currentCalendar] components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit fromDate:date]; NSDateComponents *oneDay = [[NSDateComponents alloc] init]; oneDay.day = 1; NSDate *lastMIDnight = [[NSCalendar currentCalendar] dateFromComponents:components]; NSDate *nextMIDnight = [[NSCalendar currentCalendar] dateByAddingComponents:oneDay toDate:lastMIDnight options:NSWrapCalendarComponents]; return [nspredicate predicateWithFormat:@"(%K >= %@) AND (%K <= %@)",attributename,lastMIDnight,nextMIDnight];} 来自here,here和here的灵感.
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