从日期数组中获取当前日期的日期数组时出错

Question

我有一个带有 NSDate 对象的 NSMutableArray "NewDate"

(
"2013-08-11 20:26:11 +0000",
"2013-08-11 20:26:11 +0000",
"2013-08-12 06:22:38 +0000",
"2013-08-12 07:24:14 +0000",
"2013-08-12 08:04:05 +0000"
)

我想用今天日期（8 月 12 日）的对象从这个数组中创建一个新数组

我的代码：

NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit) fromDate:[NSDate date]];
[components setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
NSDate *firstDate = [calendar dateFromComponents:components];
[components setMonth:0];
[components setDay:1];
[components setYear:0];
NSDate *secondDate = [calendar dateByAddingComponents:components toDate:firstDate options:0];

NSPredicate *firstPredicate = [NSPredicate predicateWithFormat:@"startDate > %@", firstDate];
NSPredicate *secondPredicate = [NSPredicate predicateWithFormat:@"startDate < %@", secondDate];

NSPredicate *predicate = [NSCompoundPredicate andPredicateWithSubpredicates:[NSArray arrayWithObjects:firstPredicate, secondPredicate, nil]];

NSMutableArray *results = [newDate filteredArrayUsingPredicate:predicate];
NSLog(@"%@",result);

但是在创建“结果”时它给了我错误：

*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<__NSDate 0x72a0ee0> valueForUndefinedKey:]: this class is not key value coding-compliant for the key startDate.'

我做错了什么？ 感谢您的帮助。

Answer 1

试试下面的代码。

array={"2013-08-11 20:26:11 +0000", "2013-08-11 20:26:11 +0000", "2013-08-12 06:22:38 +0000", "2013-08-12 07:24:14 +0000", "2013-08-12 08:04:05 +0000"};/////示例。

NSMutableArray *newArray=[[NSMutableArray alloc]init];
NSDate *today=[NSDate date];

NSComparisonResult result;
//has three possible values: NSOrderedSame,NSOrderedDescending, NSOrderedAscending

for(int i=0;i<array.count;i++)
{
result = [today compare:[array objectAtIndex:i]];


if(result==NSOrderedDescending)//////If matches with today's date.
{
   [newArray addObject:[array objectAtIndex:i]];
}
}

Answer 2

试试这个..

- (NSComparisonResult)compareDateOnly:(NSDate *)otherDate {
    NSUInteger dateFlags = NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit;
    NSCalendar *gregorianCalendar = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
    NSDateComponents *selfComponents = [gregorianCalendar components:dateFlags fromDate:self];
    NSDate *selfDateOnly = [gregorianCalendar dateFromComponents:selfComponents];

    NSDateComponents *otherCompents = [gregorianCalendar components:dateFlags fromDate:otherDate];
    NSDate *otherDateOnly = [gregorianCalendar dateFromComponents:otherCompents];
    return [selfDateOnly compare:otherDateOnly];
}