Question

我正在安排使用唯一标识符的通知，因此我不必为每个通知创建一个新的字符串。这一切都适用于调度，但问题在于尝试取消它们。

这是我安排通知的代码......

    foreach ($fighters1 as $fighter) {
        foreach ($fighters2 as $fighter2) {
         }
    }

这是取消通知的代码......

    let notifIdentifier = TaskManager.notification2.userInfo.description as String!
    let trigger = UNCalendarNotificationTrigger(dateMatching: components , repeats: true)
    let request = UNNotificationRequest(identifier: notifIdentifier! , content: TaskManager.notification2, trigger: trigger)
UNUserNotificationCenter.current().add(request, withCompletionHandler: nil)

当我试图取消它们时，它们非常受欢迎。我已经通过将标识符更改为常规字符串来测试代码，并且所有内容都应该正常运行，因此它绝对是唯一标识符。

有关为每个新任务/通知创建唯一ID的任何想法/建议吗？

Answer 1

安排通知

@IBAction func scheduleNotification(_ sender: AnyObject) {

    let uuid = UUID().uuidString


    let content = UNMutableNotificationContent()
    content.title = NSString.localizedUserNotificationString(forKey: "Example", arguments: nil)
    content.sound = UNNotificationSound.default()
    //...

    var dateComponents = Calendar.current.dateComponents([.year, .month, .day, .hour, .minute], from: self.datePicker.date)
    dateComponents.second = 0

    let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: false)

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

    UNUserNotificationCenter.current().add(request) { (error) in

        if let errorPerforms = error {
         print(errorPerforms.localizedDescription)
        } else {
         print("Success")
        }
    }


    let managedObject = ManagedObject(context: self.managedObjectContext!)
    managedObject.setValue(uuid, forKey: "uuid")
    //...

    do {
     try self.managedObjectContext.save()
        self.dimiss()
    } catch {}
}

从indexPath删除通知。

 // Override to support editing the table view.
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {

    switch editingStyle {
    case .delete:

        let managedObject = self.fetchedResultsController.object(at: indexPath)
        self.managedObjectContext.delete(managedObject)

        let center = UNUserNotificationCenter.current()
        center.removeDeliveredNotifications(withIdentifiers: [managedObject.uuid!])
        center.removePendingNotificationRequests(withIdentifiers: [managedObject.uuid!])

        do {
         try self.managedObjectContext.save()
            self.tableView.reloadData()
        } catch {}

    default:
        break
    }

}

这很好用！当您使用NSFetchedResultsControllerDelegate协议方法时。希望它有所帮助

用于安排通知的唯一标识符，Swift 3 iOS 10

1 个答案: