持续设置新的本地通知-ios

我正在模拟警报。

为了做到这一点,我尝试在某些条件为真时每X秒发送一次新的本地通知,并在某些条件为假时停止(当用户取消警报时)

我有一个 Set 按钮和a Stop 按钮

以下代码用于 设置 按下按钮:

@IBAction func setNotification(_ sender: Any) {
//        timeEntered = time.text!
//        let hrMin = timeEntered.components(separatedBy: ":");
        let content = UNMutableNotificationContent()
        content.title = "How many days are there in one year"
        content.subtitle = "Do you know?"
        content.body = "Do you really know?"
        content.badge = 1
        content.sound = UNNotificationSound(named: "alarm.aiff");

        while (repeatNotifications) {
            trigger = UNTimeIntervalNotificationTrigger(timeInterval: 5, repeats: false);

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

            UNUserNotificationCenter.current().add(request, withCompletionHandler: nil)
        }
}

当 停止

@IBAction func stopRepeat(_ sender: Any) {
    repeatNotifications = false
    UNUserNotificationCenter.current().removeAllPendingNotificationRequests()
    UNUserNotificationCenter.current().removeAllDeliveredNotifications()
}

现在,当我按下 设置 按钮,它卡在按下模式下(颜色变化),我不能按任何其他按钮(即: 停止 按钮)。此外,没有设置本地通知。

有没有办法做到这一点?

tl;dr:如何每隔X秒设置一次新的本地通知,直到按下某个按钮为止