本地通知 - 重复间隔（Xcode，swift2）

检查我的重复间隔代码 . 我认为它是错误的 . 我只希望用户选择通知及其工作的时间，但它还有一个问题，它是在每13或14或任何一分钟后重复我不知道为什么这样检查下面的代码，如果有人可以每周和每月帮助我？

//canceling notifications
func cancelLocalNotificationsWithUUID(uuid: String) {
    for item in UIApplication.sharedApplication().scheduledLocalNotifications {
        let notification = item as! UILocalNotification
        if let notificationUUID = notification.userInfo?["UUID"] as? String {
            if notificationUUID == uuid {
                UIApplication.sharedApplication().cancelLocalNotification(notification)
            }
        }
    }
}

@IBAction func NotificationButtonTapped(sender: AnyObject) {

     cancelLocalNotificationsWithUUID("NotificationID")

    var dateFormatter = NSDateFormatter()
    dateFormatter.dateFormat = "HH:mm"
    var strDate = dateFormatter.stringFromDate(datePicker.date)
    PickedDate.text = "Your Notification time you choosed is \(strDate)"
   PickedDate.numberOfLines = 0


    var notifications:UILocalNotification = UILocalNotification()
    notifications.fireDate = datePicker.date
    notifications.timeZone = NSTimeZone.defaultTimeZone()
    notifications.applicationIconBadgeNumber =    UIApplication.sharedApplication().applicationIconBadgeNumber + 1
    notifications.soundName = UILocalNotificationDefaultSoundName

    switch(frequencysegmentedcontrol.selectedSegmentIndex){
    case 0:
        notifications.repeatInterval = NSCalendarUnit.CalendarUnitDay
        break;
    case 1:
        notifications.repeatInterval = NSCalendarUnit.CalendarUnitWeekOfYear
        break;
    case 2:
        notifications.repeatInterval = NSCalendarUnit.CalendarUnitMonth
        break;
    default:
        notifications.repeatInterval = NSCalendarUnit.allZeros
        break;

    }
     notifications.userInfo = ["UUID": "NotificationID"]

    notifications.alertBody = "quote of the day"





  // if user has not confirmed the notification permission
          let settings = UIApplication.sharedApplication().currentUserNotificationSettings()

    if settings.types == .None {
        let ac = UIAlertController(title: "Can't schedule", message: "Either we don't have permission to schedule notifications, or we haven't asked yet.", preferredStyle: .Alert)
        ac.addAction(UIAlertAction(title: "OK", style: .Default, handler: nil))
        presentViewController(ac, animated: true, completion: nil)
        return
    }

    UIApplication.sharedApplication().scheduleLocalNotification(notifications)

}