Ios 从日期数组中获取具有当前日期的日期数组时出错

我有一个NSMutableArray“NewDate”和NSDate对象

(
"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（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);

NSCalendar*日历=[NSCalendar当前日历]；
NSDateComponents*components=[日历组件：（NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit）fromDate:[NSDate日期]]；
[组件设置时区：[NSTimeZone timeZoneForSecondsFromGMT:0]]；
NSDate*firstDate=[calendar dateFromComponents:components]；
[组件设置月份：0]；
[组件设定日：1]；
[组件设置年份：0]；
NSDate*secondDate=[calendar Date ByAddingComponents:components toDate:firstDate选项：0]；
NSPredicate*firstPredicate=[NSPredicate predicateWithFormat:@“startDate>%@”，firstDate]；
NSPredicate*secondPredicate=[NSPredicate predicateWithFormat:@“startDate<%@”，secondDate]；
NSPredicate*谓词=[NSCompoundPredicate和PredicateWithSubPredicates:[NSArray arrayWithObjects:firstPredicate，secondPredicate，nil]]；
NSMutableArray*结果=[newDate FilteredArray使用谓词：谓词]；
NSLog（@“%@”，结果）；

但在创建“结果”时，它会给我带来错误：

***由于未捕获的异常“NSUnknownKeyException”而终止应用程序，原因：“[valueForUndefinedKey:]：此类不符合密钥起始日期的键值编码。”

我做错了什么？ 谢谢你的帮助。

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];
}

---

尝试以下代码

数组={“2013-08-1120:26:11+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"};/////例如

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]];
}
}

NSMutableArray*newArray=[[NSMutableArray alloc]init]；
NSDate*今天=[NSDate日期]；
比较结果；
//有三个可能的值：nsOrderedName、nsOrderedescending、nsOrderedescending
对于（inti=0；iWell，首先，您正在创建一个名为“startDate”的完全虚构的属性您试图对第一个和第二个谓词执行什么操作？我不知道您是否询问过这一问题，但如果您只想比较NSDate的日期组件，则必须使用NSCalendar和NSDateComponents删除时间组件。类似的内容应作为NSDate的一个类别：
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]];
}
}