date谓词不起作用

来自核心数据的所有对象

{ dtStartDate = "Jun 10, 2016-10:40 AM"; }, { dtStartDate = "May 12, 2016-06:55 AM"; }, { dtStartDate = "May 12, 2016-08:05 AM"; }, { dtStartDate = "May 12, 2016-02:30 PM"; }, { dtStartDate = "Jun 12, 2016-07:50 AM"; }, { dtStartDate = "Jul 12, 2016-08:50 AM"; }, { dtStartDate = "Jun 12, 2016-07:50 AM"; }, { dtStartDate = "May 12, 2016-10:00 AM"; }, { dtStartDate = "Jun 12, 2016-07:30 AM"; } 

我使用这个date格式来预测核心数据

 NSDate *dt = [NSDate date]; NSDateFormatter *df =[[NSDateFormatter alloc] init]; [df setDateFormat:@"MMM dd, yyyy-hh:mm a"]; NSString *today =[df stringFromDate:dt]; NSDate *dateOfToday = [df dateFromString:today]; NSMutableArray *meetings=nil; 

现在我有两个条件获取未来的date（包括当前）和过去的获取date

获取未来的date（包括今天）

  NSPredicate *predicate = [NSPredicate predicateWithFormat:@"dtStartDate >= %@",dateOfToday]; NSMutableArray *meetingsArr = [[CoreDataAPI sharedInstance] checkForRecordExistInTable:@"Tbl_Meeting" withCompountPredicate:[NSArray arrayWithObjects:predicate, nil]]; 

返回9对象（全部） 错误

  NSPredicate *predicate = [NSPredicate predicateWithFormat:@"dtStartDate <= %@",dateOfToday]; NSMutableArray *meetingsArr = [[CoreDataAPI sharedInstance] checkForRecordExistInTable:@"Tbl_Meeting" withCompountPredicate:[NSArray arrayWithObjects:predicate, nil]]; 

返回0对象（无） 错误

请帮助我解决它在此先感谢

我可以手动使用这种方法和工作。 但我只想做谓词

 -(NSMutableArray *)filterMeetingsBasedOnTime:(BOOL)isPastMtng :(NSMutableArray*)arr { NSDate *dt = [NSDate date]; NSDateFormatter *df =[[NSDateFormatter alloc] init]; [df setDateFormat:@"MMM dd, yyyy-hh:mm a"]; NSMutableArray *arrMeeting = [[NSMutableArray alloc] init]; for(NSDictionary *sMtngDict in arr) { NSDate *meetDate = [df dateFromString:[sMtngDict valueForKey:@"dtStartDate"]]; if(isPastMtng) { if([meetDate timeIntervalSinceDate:dt]<0) { [arrMeeting addObject:sMtngDict]; } } else{ if([meetDate timeIntervalSinceDate:dt]>=0) { [arrMeeting addObject:sMtngDict]; } } } return arrMeeting; } 

如果是的话，我们可以在谓词中使用这个方法逻辑吗？