xcode 用户通知取消，swift3

UserNotifications cancel, swift3

提问by deniskakacka

I'm working on app where user can set time for everyday local notification, then I have an option to enable or disable these notifications. My question how I can disable/cancel already setted notification?

我正在开发应用程序，用户可以在其中设置每天本地通知的时间，然后我可以选择启用或禁用这些通知。我的问题是如何禁用/取消已设置的通知？

Here in one of this IFs I need to cancel notif

在此 IF 之一中，我需要取消通知

override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {

    if (indexPath as NSIndexPath).row == 1 && switchiBtn.isOn == false {

        return 0.0
    }
    if (indexPath as NSIndexPath).row == 2 {
        if switchiBtn.isOn == false || dpVisible == true {
            return 0.0
        }
        return 216.0
    }

    if (indexPath as NSIndexPath).row == 3 {
        if switchiBtn.isOn == false || dpVisible == true {
            return 0.0
        }
        return 44
    }
    return 50.0
}

Here are functions for schedule and button where I'm setting notif.

这是我设置通知的日程表和按钮的功能。

func scheduleNotif(date: DateComponents, completion: @escaping (_ Success: Bool) -> ()) {

    let notif = UNMutableNotificationContent()

    notif.title = "Your quote for today is ready."
    notif.body = "Click here to open an app."



    let dateTrigger = UNCalendarNotificationTrigger(dateMatching: date, repeats: true)
    let request = UNNotificationRequest(identifier: "myNotif", content: notif, trigger: dateTrigger)

    UNUserNotificationCenter.current().add(request, withCompletionHandler: { error in

        if error != nil {
            print(error)
            completion(false)
        } else {
            completion(true)
        }
    })
}


@IBAction func setACTION(_ sender: AnyObject) {

    let hour = datePicker.calendar.component(.hour, from: datePicker.date)
    let minute = datePicker.calendar.component(.minute, from: datePicker.date)

    var dateComponents = DateComponents()
    dateComponents.hour = hour
    dateComponents.minute = minute
    print(dateComponents)

    scheduleNotif(date: dateComponents, completion: { success in
        if success {
            print("SUCCESS")

        } else {
            print("ERROR")
        }
    })

Thanks.

谢谢。

回答by KrishnaCA

For cancelling all pending notifications, you can use this:

要取消所有挂起的通知，您可以使用：

UNUserNotificationCenter.current().removeAllPendingNotificationRequests()

For cancelling specific notifications,

如需取消特定通知，

UNUserNotificationCenter.current().getPendingNotificationRequests { (notificationRequests) in
   var identifiers: [String] = []
   for notification:UNNotificationRequest in notificationRequests {
       if notification.identifier == "identifierCancel" {
          identifiers.append(notification.identifier)
       }
   }
   UNUserNotificationCenter.current().removePendingNotificationRequests(withIdentifiers: identifiers)
}

回答by Zac Kwan

The way sameUNNotificationis identify are base on the identifierpassed when you create the UNNotificationRequest.

相同的方式UNNotification是基于identifier创建UNNotificationRequest.

In your example above,

在你上面的例子中，

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

You have actually hardcoded the identifierto be "myNotif". This way, whenever you want to delete the already set notification you can do this:

你确实有硬编码的identifier是"myNotif"。这样，无论何时您想删除已设置的通知，您都可以执行以下操作：

UNUserNotificationCenter.current().removePendingNotificationRequests(withIdentifiers: "myNotif")

However, do take note that when you hardcode the identifier, every time when you add a requestto UNUserNotificationCenterthe notification is actually being replaced.

但是，请注意，当您对标识符进行硬编码时，每次request向UNUserNotificationCenter通知添加 a 时实际上都被替换了。

Example, if you scheduled a "myNotif"requestset on 1 minute later but you call another function to schedule a "myNotif"at 1 hour later it will be replaced. Therefore only the latest "myNotif"at one hour later will be in the pendingNotificationRequest.

例如，如果您"myNotif"request在 1 分钟后安排了一个集合，但您调用另一个函数将一个安排"myNotif"在 1 小时后，它将被替换。因此，只有最晚"myNotif"一小时后才会在pendingNotificationRequest.

回答by Yannick Winter

As mentioned hereyou can cancel all notifications with the following code:

正如这里提到的，您可以使用以下代码取消所有通知：

UIApplication.sharedApplication().cancelAllLocalNotifications()

UIApplication.sharedApplication().cancelAllLocalNotifications()