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在 switch 中，我有一个通知触发器，可以重复自身。如何让它在开关关闭时停止？
let notification = UILocalNotification()
notification.fireDate = NSDate(timeIntervalSinceNow: 5)
notification.repeatInterval = NSCalendarUnit.Minute
notification.alertBody = "Please Look at me"
notification.soundName = UILocalNotificationDefaultSoundName
notification.userInfo = ["CustomField1": "w00t"]
guard let settings = UIApplication.sharedApplication().currentUserNotificationSettings() else { return }