快速的本地通知

Question

我必须在我的应用中发出本地通知，该通知应在设置日期和时间时发出，该通知应在设置时间后1小时后30分钟之前发出。例如。如果通知日期和时间为2019-06-05 11:00 am，则本地通知应首先出现在上午10:30，然后出现在下午12:00。

这是我所做的代码，但它恰好与我设置的时间相同。

func schedule() {
        let calendar = Calendar.current
        let components = DateComponents(year: 2019, month: 06, day: 05, hour: 10, minute: 06) // Setting date here for local Notification
        let date = calendar.date(from: components)
        let comp2 = calendar.dateComponents([.year,.month,.day,.hour,.minute], from: date!)
        let trigger = UNCalendarNotificationTrigger(dateMatching: comp2, repeats: false)
//        let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 10, repeats: false)

        let content = UNMutableNotificationContent()
        content.title = "Notification Demo"
        content.subtitle = "Demo"
        content.body = "Notification on specific date!!"
        if #available(iOS 12.0, *) {
            content.sound = UNNotificationSound.defaultCritical
        } else {
            content.sound = UNNotificationSound.default
        }

        let request = UNNotificationRequest(identifier: "identifier", content: content, trigger: trigger)

        UNUserNotificationCenter.current().add(request, withCompletionHandler: { error in
            if error != nil {
                //handle error
            } else {
                //notification set up successfully
            }
        })
    }

任何帮助将不胜感激。