删除特定的本地通知

Question

我正在开发一个基于本地通知的 iPhone 闹钟应用程序。

删除警报后，相关的本地通知应被取消。但是我如何才能准确确定要取消本地通知数组中的哪个对象呢？

我知道 [[UIApplication sharedApplication] cancelLocalNotification:notification] 方法，但如何获取此“通知”来取消它？

Answer 1

您可以在本地通知的用户信息中保存唯一的键值。
获取所有本地通知，循环遍历数组并删除特定通知。

代码如下，

OBJ-C:

UIApplication *app = [UIApplication sharedApplication];
NSArray *eventArray = [app scheduledLocalNotifications];
for (int i=0; i<[eventArray count]; i++)
{
    UILocalNotification* oneEvent = [eventArray objectAtIndex:i];
    NSDictionary *userInfoCurrent = oneEvent.userInfo;
    NSString *uid=[NSString stringWithFormat:@"%@",[userInfoCurrent valueForKey:@"uid"]];
    if ([uid isEqualToString:uidtodelete])
    {
        //Cancelling local notification
        [app cancelLocalNotification:oneEvent];
        break;
    }
}

SWIFT:

var app:UIApplication = UIApplication.sharedApplication()
for oneEvent in app.scheduledLocalNotifications {
    var notification = oneEvent as UILocalNotification
    let userInfoCurrent = notification.userInfo! as [String:AnyObject]
    let uid = userInfoCurrent["uid"]! as String
    if uid == uidtodelete {
        //Cancelling local notification
        app.cancelLocalNotification(notification)
        break;
    }
}

UserNotification:

如果你使用UserNotification (iOS 10+)，只需按照以下步骤操作：

1. 创建 UserNotification 内容时，添加唯一的 标识符

2. 使用removePendingNotificationRequests(withIdentifiers:)

3. 使用删除特定已发送的通知<一href="https://developer.apple.com/reference/usernotifications/unusernotificationcenter/1649500-removedeliverednotifications">removeDeliveredNotifications(withIdentifiers:)

有关详细信息，UNUserNotificationCenter

Answer 2

其他选项：

首先，当您创建本地通知时，可以将其存储在用户默认值中以供将来使用，本地通知对象不能直接存储在用户默认值中，需要先将该对象转换为 NSData 对象，然后 < code>NSData 可以存储到用户默认值中。下面是代码：

NSData *data = [NSKeyedArchiver archivedDataWithRootObject:localNotif];
[[NSUserDefaults standardUserDefaults] setObject:data forKey:[NSString  stringWithFormat:@"%d",indexPath.row]];

在您存储并安排本地通知后，将来可能会要求您取消之前创建的任何通知，以便您可以从用户默认值中检索它。

NSData *data= [[NSUserDefaults standardUserDefaults] objectForKey:[NSString   stringWithFormat:@"%d",UniqueKey]];

UILocalNotification *localNotif = [NSKeyedUnarchiver unarchiveObjectWithData:data];
NSLog(@"Remove localnotification  are %@", localNotif);
[[UIApplication sharedApplication] cancelLocalNotification:localNotif];
[[NSUserDefaults standardUserDefaults] removeObjectForKey:[NSString stringWithFormat:@"%d",UniqueKey]];

希望这有帮助

Answer 3

这就是我所做的。

创建通知时执行以下操作：

  // Create the notification

UILocalNotification *notification = [[UILocalNotification alloc]  init] ;



notification.fireDate = alertDate;
notification.timeZone = [NSTimeZone localTimeZone] ;
notification.alertAction = NSLocalizedString(@"Start", @"Start");
notification.alertBody = **notificationTitle**;
notification.repeatInterval= NSMinuteCalendarUnit;

notification.soundName=UILocalNotificationDefaultSoundName;
notification.applicationIconBadgeNumber = 1;

[[UIApplication sharedApplication] scheduleLocalNotification:notification] ;

尝试删除通知时执行以下操作：

 NSArray *arrayOfLocalNotifications = [[UIApplication sharedApplication] scheduledLocalNotifications] ;

for (UILocalNotification *localNotification in arrayOfLocalNotifications) {

    if ([localNotification.alertBody isEqualToString:savedTitle]) {
        NSLog(@"the notification this is canceld is %@", localNotification.alertBody);

        [[UIApplication sharedApplication] cancelLocalNotification:localNotification] ; // delete the notification from the system

    }

}

此解决方案应该适用于多个通知，并且您不管理任何数组、字典或用户默认值。您只需使用已保存到系统通知数据库中的数据即可。

希望这对未来的设计师和开发人员有所帮助。

祝各位编码愉快！ ：D

Answer 4

快速调度和删除通知：

    static func scheduleNotification(notificationTitle:String, objectId:String) {

    var localNotification = UILocalNotification()
    localNotification.fireDate = NSDate(timeIntervalSinceNow: 24*60*60)
    localNotification.alertBody = notificationTitle
    localNotification.timeZone = NSTimeZone.defaultTimeZone()
    localNotification.applicationIconBadgeNumber = 1
    //play a sound
    localNotification.soundName = UILocalNotificationDefaultSoundName;
    localNotification.alertAction = "View"
    var infoDict :  Dictionary<String,String!> = ["objectId" : objectId]
    localNotification.userInfo = infoDict;

    UIApplication.sharedApplication().scheduleLocalNotification(localNotification)
}
    static func removeNotification(objectId:String) {
    var app:UIApplication = UIApplication.sharedApplication()

    for event in app.scheduledLocalNotifications {
        var notification = event as! UILocalNotification
        var userInfo:Dictionary<String,String!> = notification.userInfo as! Dictionary<String,String!>
        var infoDict :  Dictionary = notification.userInfo as! Dictionary<String,String!>
        var notifcationObjectId : String = infoDict["objectId"]!

        if notifcationObjectId == objectId {
            app.cancelLocalNotification(notification)
        }
    }



}

Answer 5

Swift 4 解决方案：

UNUserNotificationCenter.current().getPendingNotificationRequests { (requests) in
  for request in requests {
    if request.identifier == "identifier" {
      UNUserNotificationCenter.current().removePendingNotificationRequests(withIdentifiers: ["identifier"])
    }
  }
}   

Answer 6

iMOBDEV 的解决方案可以完美地删除特定通知（例如删除警报后），但当您需要有选择地删除时它特别有用任何已触发且仍在通知中心的通知。

一种可能的情况是：警报通知触发，但用户打开应用程序而没有点击该通知并再次安排该警报。
如果您想确保通知中心只能显示给定项目/警报的一个通知，这是一个很好的方法。它还允许您不必在每次打开应用程序时清除所有通知，这应该更适合该应用程序。

• 创建本地通知后，使用 NSKeyedArchiver 将其存储为 UserDefaults 中的 Data。您可以创建一个与您在通知的 userInfo 字典中保存的键相同的键。如果它与 Core Data 对象关联，您可以使用其唯一的 objectID 属性。
• 使用 NSKeyedUnarchiver 检索它。现在您可以使用 cancelLocalNotification 方法删除它。
• 相应地更新 UserDefaults 上的密钥。

下面是该解决方案的 Swift 3.1 版本（适用于 iOS 10 以下的目标）：

存储

// localNotification is the UILocalNotification you've just set up
UIApplication.shared.scheduleLocalNotification(localNotification)
let notificationData = NSKeyedArchiver.archivedData(withRootObject: localNotification)
UserDefaults.standard.set(notificationData, forKey: "someKeyChosenByYou")

检索和删除

let userDefaults = UserDefaults.standard
if let existingNotificationData = userDefaults.object(forKey: "someKeyChosenByYou") as? Data,
    let existingNotification = NSKeyedUnarchiver.unarchiveObject(with: existingNotificationData) as? UILocalNotification {

    // Cancel notification if scheduled, delete it from notification center if already delivered    
    UIApplication.shared.cancelLocalNotification(existingNotification)

    // Clean up
    userDefaults.removeObject(forKey: "someKeyChosenByYou")
}

Answer 7

Swift 版本，如果需要：

func cancelLocalNotification(UNIQUE_ID: String){

        var notifyCancel = UILocalNotification()
        var notifyArray = UIApplication.sharedApplication().scheduledLocalNotifications

        for notifyCancel in notifyArray as! [UILocalNotification]{

            let info: [String: String] = notifyCancel.userInfo as! [String: String]

            if info[uniqueId] == uniqueId{

                UIApplication.sharedApplication().cancelLocalNotification(notifyCancel)
            }else{

                println("No Local Notification Found!")
            }
        }
    }

Answer 8

您可以在像这样安排通知时保留一个带有类别标识符的字符串

        localNotification.category = NotificationHelper.categoryIdentifier

，然后搜索它并在需要时取消，像这样

let  app = UIApplication.sharedApplication()

    for notification in app.scheduledLocalNotifications! {
        if let cat = notification.category{
            if cat==NotificationHelper.categoryIdentifier {
                app.cancelLocalNotification(notification)
                break
            }

        }
    }

Answer 9

swift 3-style:

final private func cancelLocalNotificationsIfIOS9(){


//UIApplication.shared.cancelAllLocalNotifications()
let app = UIApplication.shared
guard let notifs = app.scheduledLocalNotifications else{
    return
}

for oneEvent in notifs {
    let notification = oneEvent as UILocalNotification
    if let userInfoCurrent = notification.userInfo as? [String:AnyObject], let uid = userInfoCurrent["uid"] as? String{
        if uid == uidtodelete {
            //Cancelling local notification
            app.cancelLocalNotification(notification)
            break;
        }
    }
}

}

对于 iOS 10 使用：

    let center = UNUserNotificationCenter.current()
    center.removePendingNotificationRequests(withIdentifiers: [uidtodelete])

Answer 10

您传递给 cancelLocalNotification: 的 UILocalNotification 对象将与具有匹配属性的任何现有 UILocalNotification 对象相匹配。

因此：

UILocalNotification *notification = [[UILocalNotification alloc] init];
notification.alertBody = @"foo";
[[UIApplication sharedApplication] presentLocalNotificationNow:notification];

将显示一个本地通知，稍后可以通过以下方式取消：

UILocalNotification *notification = [[UILocalNotification alloc] init];
notification.alertBody = @"foo";
[[UIApplication sharedApplication] cancelLocalNotification:notification];

Answer 11

我在 Swift 2.0 中使用这个函数：

  static func DeleteNotificationByUUID(uidToDelete: String) -> Bool {
    let app:UIApplication = UIApplication.sharedApplication()
    // loop on all the current schedualed notifications
    for schedualedNotif in app.scheduledLocalNotifications! {
      let notification = schedualedNotif as UILocalNotification
      let urrentUi = notification.userInfo! as! [String:AnyObject]
      let currentUid = urrentUi["uid"]! as! String
      if currentUid == uidToDelete {
        app.cancelLocalNotification(notification)
        return true
      }
    }
    return false
  }

灵感来自@KingofBliss's Answer

Answer 12

对于重复提醒（例如，您希望闹钟在周日、周六和周三下午 4 点触发，那么您必须设置 3 个闹钟并将 RepeatInterval 设置为 NSWeekCalendarUnit ）。

用于制作仅一次提醒：

UILocalNotification *aNotification = [[UILocalNotification alloc] init];
                aNotification.timeZone = [NSTimeZone defaultTimeZone];
                aNotification.alertBody = _reminderTitle.text;
                aNotification.alertAction = @"Show me!";
                aNotification.soundName = UILocalNotificationDefaultSoundName;
                aNotification.applicationIconBadgeNumber += 1;

                NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
                NSDateComponents *componentsForFireDate = [calendar components:(NSYearCalendarUnit | NSWeekCalendarUnit|  NSHourCalendarUnit | NSMinuteCalendarUnit| NSSecondCalendarUnit | NSWeekdayCalendarUnit) fromDate: _reminderDate];

                [componentsForFireDate setHour: [componentsForFireDate hour]] ; //for fixing 8PM hour
                [componentsForFireDate setMinute:[componentsForFireDate minute]];

                [componentsForFireDate setSecond:0] ;
                NSDate *fireDateOfNotification = [calendar dateFromComponents: componentsForFireDate];
                aNotification.fireDate = fireDateOfNotification;
                NSDictionary *infoDict = [NSDictionary dictionaryWithObject:_reminderTitle.text forKey:kRemindMeNotificationDataKey];
                aNotification.userInfo = infoDict;

                [[UIApplication sharedApplication] scheduleLocalNotification:aNotification];

用于制作重复提醒：

for (int i = 0 ; i <reminderDaysArr.count; i++)
                {

                    UILocalNotification *aNotification = [[UILocalNotification alloc] init];
                    aNotification.timeZone = [NSTimeZone defaultTimeZone];
                    aNotification.alertBody = _reminderTitle.text;
                    aNotification.alertAction = @"Show me!";
                    aNotification.soundName = UILocalNotificationDefaultSoundName;
                    aNotification.applicationIconBadgeNumber += 1;

                    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
                    NSDateComponents *componentsForFireDate = [calendar components:(NSYearCalendarUnit | NSWeekCalendarUnit|  NSHourCalendarUnit | NSMinuteCalendarUnit| NSSecondCalendarUnit | NSWeekdayCalendarUnit) fromDate: _reminderDate];


                    [componentsForFireDate setWeekday: [[reminderDaysArr objectAtIndex:i]integerValue]];

                    [componentsForFireDate setHour: [componentsForFireDate hour]] ; // Setup Your Own Time.
                    [componentsForFireDate setMinute:[componentsForFireDate minute]];

                    [componentsForFireDate setSecond:0] ;
                    NSDate *fireDateOfNotification = [calendar dateFromComponents: componentsForFireDate];
                    aNotification.fireDate = fireDateOfNotification;
                    aNotification.repeatInterval = NSWeekCalendarUnit;
                    NSDictionary *infoDict = [NSDictionary dictionaryWithObject:_reminderTitle.text forKey:kRemindMeNotificationDataKey];
                    aNotification.userInfo = infoDict;

                    [[UIApplication sharedApplication] scheduleLocalNotification:aNotification];
                }
            }

用于过滤，您可以排列显示它。

-(void)filterNotficationsArray:(NSMutableArray*) notificationArray{

    _dataArray = [[NSMutableArray alloc]initWithArray:[[UIApplication sharedApplication] scheduledLocalNotifications]];
    NSMutableArray *uniqueArray = [NSMutableArray array];
    NSMutableSet *names = [NSMutableSet set];

    for (int i = 0 ; i<_dataArray.count; i++) {
        UILocalNotification *localNotification = [_dataArray objectAtIndex:i];
        NSString * infoDict = [localNotification.userInfo objectForKey:@"kRemindMeNotificationDataKey"];

        if (![names containsObject:infoDict]) {
            [uniqueArray addObject:localNotification];
            [names addObject:infoDict];
        }
    }
    _dataArray = uniqueArray;
}

要删除提醒，即使它是“仅一次”或“重复”：

- (void) removereminder:(UILocalNotification*)notification
{
    _dataArray = [[NSMutableArray alloc]initWithArray:[[UIApplication sharedApplication]scheduledLocalNotifications]];

    NSString * idToDelete = [notification.userInfo objectForKey:@"kRemindMeNotificationDataKey"];
    for (int i = 0 ; i<_dataArray.count; i++)
    {
        UILocalNotification *currentLocalNotification = [_dataArray objectAtIndex:i];
        NSString * notificationId = [currentLocalNotification.userInfo objectForKey:@"kRemindMeNotificationDataKey"];

        if ([notificationId isEqualToString:idToDelete])
            [[UIApplication sharedApplication]cancelLocalNotification:currentLocalNotification];
    }

    _dataArray = [[NSMutableArray alloc]initWithArray:[[UIApplication sharedApplication]scheduledLocalNotifications]];
    [self filterNotficationsArray:_dataArray];
    [_remindersTV reloadData];

}

Answer 13

我对 KingofBliss 的答案进行了一些扩展，编写得更像 Swift2 一点，删除了一些不必要的代码，并添加了一些防撞装置。

首先，在创建通知时，您需要确保设置通知的 userInfo 的 uid（或任何自定义属性）：

notification.userInfo = ["uid": uniqueid]

然后，在删除它时，您可以执行以下操作：

guard
    let app: UIApplication = UIApplication.sharedApplication(),
    let notifications = app.scheduledLocalNotifications else { return }
for notification in notifications {
    if
        let userInfo = notification.userInfo,
        let uid: String = userInfo["uid"] as? String where uid == uidtodelete {
            app.cancelLocalNotification(notification)
            print("Deleted local notification for '\(uidtodelete)'")
    }
}

Answer 14

删除已发送的通知 Swift5

       UNUserNotificationCenter.current().getDeliveredNotifications{ (requests) in
            for request in requests {
                if request.request.identifier == "identifier"{
                    UNUserNotificationCenter.current().removeDeliveredNotifications(withIdentifiers: ["identifier"])
                }
            }
        }