iOS时间合并

合并同一时间的课程，同一时间可能有多个课程，比如13:30-14:00 13:40-14:40

//递归实现 

-(void)mergeClassSchedule:(NSMutableArray*)ary 

 retArray:(NSMutableArray*)retAry 

 beginDate:(NSDate*)beginDate 

 endDate:(NSDate*)endDate 

{ 

 NSMutableArray *groupAry=[NSMutableArray new]; 

 if ([ary count]>0) { 

 [retAry addObject:groupAry]; 

 } 

 while ([ary count]>0) 

 { 


 XSClassScheduleModel *classSchedulemodel=[ary objectAtIndex:0]; 

 if (beginDate==nil) 

 { 

 beginDate=[XSUtil str2DateEx:classSchedulemodel.BeginDateTimeUTC]; 

 endDate=[XSUtil str2DateEx:classSchedulemodel.EndDateTimeUTC]; 


 [groupAry addObject:classSchedulemodel]; 


 [ary removeObjectAtIndex:0]; 

 } 

 else 

 { 

 NSDate *beginDate2=[XSUtil str2DateEx:classSchedulemodel.BeginDateTimeUTC]; 

 NSDate *endDate2=[XSUtil str2DateEx:classSchedulemodel.EndDateTimeUTC]; 


 if (([beginDate compare:beginDate2]==NSOrderedAscending || [beginDate compare:beginDate2]==NSOrderedSame) 

 && [endDate compare:beginDate2]==NSOrderedDescending) 

 { 

 [groupAry addObject:classSchedulemodel]; 

 [ary removeObjectAtIndex:0]; 

 endDate=[endDate compare:endDate2]==NSOrderedAscending?endDate2:endDate; 

 } 

 else 

 { 


 beginDate=nil; 

 [self mergeClassSchedule:ary retArray:retAry beginDate:beginDate endDate:endDate]; 


 } 


 } 

 } 

}