ios – UILocalNotification应该每个工作日重复,但周末也会发生

我有一个UIlocalnotification,应该是一天一个星期一到星期五,但不是在周末.我认为将通知的repeaTinterval属性设置到NSWeekdayCalendarUnit将会实现这一点.可悲的是,我的通知仍在周末开放.有人可以建议为什么吗这是我的代码：

UIlocalnotification *localnotification = [[UIlocalnotification alloc] init];

localnotification.alertAction = @"View";
localnotification.alertBody = NSLocalizedString(@"ALERT_messaGE",nil);
localnotification.soundName = UIlocalnotificationDefaultSoundName;

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"MM-dd-yyyy HH:mm"];
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithName:@"America/Toronto"]];

// Notification fire times are set by creaTing a notification whose fire date 
// is an arbitrary weekday at the correct time,and having it repeat every weekday
NSDate *fireDate = [dateFormatter dateFromString:@"01-04-2012 11:00"]; 

localnotification.fireDate = fireDate;
localnotification.repeaTinterval = NSWeekdayCalendarUnit;
[[UIApplication sharedApplication] schedulelocalnotification:localnotification];
            break;

[localnotification release];

UIlocalnotification *notification = [[[UIlocalnotification alloc] init] autorelease];

// Set this to an NSDate that is for the time you want,on Monday
notification.fireDate = fireDate;            

// Repeat every week
notification.repeaTinterval = NSWeekCalendarUnit;