删除特定的本地通知-Java 学习之路

我正在开发基于本地通知的iPhone闹钟应用程序 .

删除警报时，相关的本地通知应取消 . 但是，如何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，但我怎么能让这个'notification'取消呢？

13 回答

在安排通知时，您可以保留带有类别标识符的字符串

localNotification.category = NotificationHelper.categoryIdentifier

并搜索它并在需要时取消

let  app = UIApplication.sharedApplication()

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

        }
    }

回复于 2024-04-19T08:24:54+08:00

您可以在本地通知的userinfo中为密钥保存唯一值 . 获取所有本地通知，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:

如果您使用UserNotification（iOS 10），请按以下步骤操作：

创建UserNotification内容时，添加唯一identifier
使用removePendingNotificationRequests(withIdentifiers:)删除特定的待处理通知
使用removeDeliveredNotifications(withIdentifiers:)删除特定的已发送通知

欲了解更多信息，UNUserNotificationCenter

回复于 2024-04-19T08:24:54+08:00

其他选择：

首先，当您创建本地通知时，您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，此对象需要先转换为NSData对象，然后才能存储 NSData 进入 User defaults . 以下是代码：

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

存储和计划本地通知后，将来可能需要取消您之前创建的任何通知，因此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]];

希望这可以帮助

回复于 2024-04-19T08:24:54+08:00

这就是我做的 .

创建通知时，请执行以下操作：

// 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] ;

当试图删除它时，请执行以下操作：

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

    }

}

此解决方案应适用于多个通知，并且您不管理任何阵列或字典或用户默认值 . 您只需使用已保存到系统通知数据库的数据即可 .

希望这有助于未来的设计师和开发者

快乐的编码家伙！：d

回复于 2024-04-19T08:24:54+08:00

在swift中调度和删除通知：

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)
        }
    }



}

回复于 2024-04-19T08:24:54+08:00

8
iMOBDEV的solution可以完美地删除特定通知（例如删除警报后），但是当您需要有选择地删除任何已经触发但仍在通知中心的通知时，它特别有用 .

可能的情况是：警报的通知触发，但用户打开应用程序而不点击该通知并再次安排该警报 . 如果您想确保给定项目/警报的通知中心只能有一个通知，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，这样可以更好地适应应用程序 .
- 创建本地通知后，使用 NSKeyedArchiver 将其作为 Data 存储在 UserDefaults 中 . 您可以创建一个等于're saving in the notification' userInfo字典的密钥 . 如果它与Core Data对象关联，则可以使用其唯一的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 上的键 .
这是该解决方案的Swift 3.1版本（适用于iOS 10以下的目标）：

Store
```
// 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")
```
Retrieve and delete
```
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")
}
```
回复于 2024-04-19T08:24:54+08:00

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!")
            }
        }
    }

回复于 2024-04-19T08:24:54+08:00

Swift 4 solution:

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

回复于 2024-04-19T08:24:54+08:00

212

传递给 cancelLocalNotification: 的UILocalNotification对象将匹配具有匹配属性的任何现有UILocalNotification对象 .

所以：

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

将提供本地通知，以后可以通过以下方式取消：

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

回复于 2024-04-19T08:24:54+08:00

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的答案

回复于 2024-04-19T08:24:54+08:00

对于重复提醒（例如，您希望在下午4点在太阳，周六和周三发出警报，然后您必须发出3个警报并将repeatInterval设置为NSWeekCalendarUnit） .

制作Once Only Reminder：

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];

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];
                }
            }

对于过滤数组以显示它 .

-(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，即使它只是一次或重复：

- (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];

}

回复于 2024-04-19T08:24:54+08:00

我稍微扩展了KingofBliss的答案，写了一些类似Swift2的东西，删除了一些不必要的代码，并添加了一些防撞板 .

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，删除时，您可以：

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)'")
    }
}

回复于 2024-04-19T08:24:54+08:00

迅捷3式：

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])

回复于 2024-04-19T08:24:54+08:00

删除特定的本地通知

13 回答

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