我遇到以下任务有困难：我有一个NSMutableArray包含NSManagedObjects“openingHours”,我从核心数据中提取.
NSMutableArray *openingHoursArray = [NSMutableArray arrayWithArray: [[museum valueForKey:@"openingHours"] allObjects]];
数组未排序,因为从我的NSManagedObject“博物馆”获取键的值会返回一个随机组织的集合.
数组中的NSManagedObjects“openingHours”具有NSDate类型的值,可通过键“start”和“end”访问.现在,以一种有意义的方式显示我的营业时间,我访问相应日期的工作日和时间信息,到目前为止使用这段代码工作正常：
NSLocale *locale = [[NSLocale alloc] initWithLocaleIdentifier:mainDelegate.localeCode]; NSDateFormatter *weekday = [[[NSDateFormatter alloc] init] autorelease]; [weekday setLocale:locale]; [weekday setDateFormat: @"EEEE"]; [NSDateFormatter *time = [[[NSDateFormatter alloc] init] autorelease]; [time setLocale:locale]; [time setTimeStyle:NSDateFormatterShortStyle]; for (NSManagedObject *openingHour in openingHoursArray) { NSLog(@"%@",[openingHour valueForKey:@"start"]); NSDate *startDate = [openingHour valueForKey:@"start"]; NSDate *endDate = [openingHour valueForKey:@"end"]; NSString *startDay = [weekday stringFromDate:startDate]; NSString *endDay = [weekday stringFromDate:endDate]; NSString *startTime = [time stringFromDate:startDate]; NSString *endTime = [time stringFromDate:endDate]; if (![startDay isEqualToString:endDay]) { [openingHouRSString appendFormat:@"%@ - %@:\t%@ - %@ \n",startDay,endDay,startTime,endTime]; } else { [openingHouRSString appendFormat:@"%@:\t%@ - %@ \n",endTime]; } }
这给了我想要的输出：
周四：上午10:00 – 晚上9:00
周五 – 周日：上午10:00 – 下午6:00
周一至周三：上午10:00至下午5:00
现在的问题是：我当然希望首先显示星期一的开放时间.我需要按开始日期值的工作日对数组进行排序.我尝试使用以下方法对其进行排序：
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"start" ascending:TRUE]; [openingHoursArray sortUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];
但显然这不起作用,因为它只按日期排序,并且不幸的是1970-01-01星期四,因此星期四将是我的数组的第一项按上面的代码排序.
有没有人对如何“解决这个问题”有一个好主意？ :-)我完全坚持这个..
非常感谢！
解决方法
这样的事情应该有效：
NSCalendar *calendar = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease]; NSArray *sortedArray = [openingHoursArray sortedArrayUsingComparator: ^(id obj1,id obj2) { NSDate *startDate1 = [obj1 valueForKey:@"start"]; NSDate *startDate2 = [obj2 valueForKey:@"start"]; NSDateComponents *components1 = [calendar components:NSWeekdayCalendarUnit fromDate:startDate1]; NSDateComponents *components2 = [calendar components:NSWeekdayCalendarUnit fromDate:startDate2]; NSInteger weekday1 = [components1 weekday]; if (weekday1 == 1) weekday1 = 8; //Order sundays last NSInteger weekday2 = [components2 weekday]; if (weekday2 == 1) weekday2 = 8; return [[NSNumber numberWithInteger:weekday1] compare:[NSNumber numberWithInteger:weekday2]]; }];