ios – 计划通知在特定时间触发 – Swift

在我的应用程序中,我有一个uidatepickerview,让用户选择一个时间.目前在我的代码中,我选择的时间作为dateA传递.然后我循环查看在单独的uitableview中选择的所有日期,并检查它们是否等于今天(例如星期二).如果天数相同,那么我会在选定的时间发送通知作为dateA.但是,当我尝试发送通知时,它不会被发送.

这是我的代码片段,显示了我尝试过的内容：

var dateA: Date? = nil//where selected time is kept

    var weekdaysChecked = [String]()//where selected weekdays are kept

    var alarms = [Alarm]() {
        didSet {
            tableView.reloadData()
        }
    }


    override func viewDidLoad() {
        UNUserNotificationCenter.current().requestAuthorization(options: [.alert,.sound],completionHandler: { (didAllow,error) in
        })

    }


    func tableView(_ tableView: UITableView,cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "alarmCell",for: indexPath) as! DisplayAlarmCell

        let row = indexPath.row
        let alarm = alarms[row]
        let date = Date()
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat  = "EEEE"//"EE" to get short style
        let dayInWeek = dateFormatter.string(from: date)


        if(alarms.count == 40) {
            self.navigationItem.rightBarButtonItem?.isEnabled = false
            tableView.reloadData()
        }

        cell.alarmTitle.text = alarm.alarmLabel
        cell.clockTitle.text = alarm.time

        for weekdays in weekdaysChecked {
            if(dayInWeek == weekdays){
                let content = UNMutableNotificationContent()
                content.title = alarm.alarmLabel!
                content.subtitle = alarm.time!
                content.sound = UNNotificationSound(named: "Spaceship_Alarm.mp3")

                let trigger = Calendar.current.dateComponents([.hour,.minute],from: dateA!)
                let triggerNotif = UNCalendarNotificationTrigger(dateMatching: trigger,repeats: false)

                let triggerRequest = UNNotificationRequest(identifier: "AlarmNotif",content: content,trigger: triggerNotif)

                UNUserNotificationCenter.current().add(triggerRequest,withCompletionHandler: nil)

                print("This is the correct day.")
            }
        }