ios – 确定NSDate目前是否属于NSPredicate

我已经尝试了多种方法,并在这个网站上尝试了一些建议,但是如何确定CoreData属性“dueDate”是否等于“今天”,我知道NSDate也是一个特定的时间,但我希望谓词返回无论白天是什么时间,它都是同一天/月/年.有什么建议？ 这就是我想出的：

- (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, attributeName, nextMidnight];
}

来自here,here和here的灵感.