是否需要 NSNotificationCenter 来取消 UILocalnotficiation？

Posted 2023-02-24

【中文标题】是否需要 NSNotificationCenter 来取消 UILocalnotficiation？

【英文标题】：Is NSNotificationCenter necessary to cancel UILocalnotficiation?

【发布时间】：2013-05-06 16:32:28

【问题描述】：

我想取消 UILocalnotification ，当我取消通知时，通知仍然被触发。我想知道我是否必须调用 appdelegate 中的任何委托方法来取消通知。我正在使用的代码正在正确执行。但是通知被触发了。 我应该使用具有 removeObserver 方法的 NSNotification 中心来取消 uilocalnotification。

UILocalnotification 是从应用还是从设备触发通知。

更新 - 这就是我安排通知的方式

 -(UILocalNotification *)scheduleNotification :(int)remedyID
        
           NSString *descriptionBody;

           NSInteger frequency;

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

            NSLog(@"%d",remedyID);

            descriptionBody =[[self remedyDetailsForRemedyID:remedyID] objectForKey:@"RemedyTxtDic"];
            frequency = [[[self remedyDetailsForRemedyID:remedyID] objectForKey:@"RemedyFrequency"]intValue];

            NSArray *notificationFireDates = [self fireDatesForFrequency:frequency];

            for (NSDate *fireDate in notificationFireDates)
            
                    notif.timeZone = [NSTimeZone defaultTimeZone];


                    notif.repeatInterval = NSDayCalendarUnit;
                    notif.alertBody = [NSString stringWithString:descriptionBody];
                    notif.alertAction = @"Show me";
                    notif.soundName = UILocalNotificationDefaultSoundName;

                    notif.applicationIconBadgeNumber = 1;

                    notif.fireDate = fireDate;

                    NSDictionary *userDict = [NSDictionary dictionaryWithObjectsAndKeys:notif.alertBody,                                         @"kRemindMeNotificationDataKey",  [NSNumber numberWithInt:remedyID],kRemindMeNotificationRemedyIDKey,
                                              nil];

                    notif.userInfo = userDict;

                    [[UIApplication sharedApplication] scheduleLocalNotification:notif];
                

                return notif;

    

取消通知

 - (void)cancelNotification:(int)remedyId
    
    NSArray *notifications = [[UIApplication sharedApplication] scheduledLocalNotifications];
    NSLog(@"Cancelling... Before %d",[[[UIApplication sharedApplication]scheduledLocalNotifications]count]);

      for (UILocalNotification *notification in notifications)
      

      int notifRemedyId = [[notification.userInfo objectForKey:@"kRemindMeNotificationRemedyIDKey"]intValue]; 
        NSLog(@"remedyID  : %d",remedyId);
        NSLog(@"notifyId : %d",notifRemedyId);
        if (remedyId == notifRemedyId) 
            [[UIApplication sharedApplication] cancelLocalNotification:notification];
          
       

    NSLog(@"Cancelling... After %d",[[[UIApplication sharedApplication]scheduledLocalNotifications]count]);

     

【参考方案1】：

NSNotification 中心有 removeObserver 方法来取消 uilocalnotification。

NSNotificationCenter 与 UILocalNotification 没有任何关系。很抱歉他们都在名字中的某个地方使用了“通知”，但这只是巧合。

【参考方案2】：

scheduledLocalNotifications 会给你所有预定通知的列表和使用

- (void)cancelLocalNotification:(UILocalNotification *)notification

或者您可以使用以下命令全部取消：

[[UIApplication sharedApplication] cancelAllLocalNotifications];

编辑：

NSString *notifRemedyId = @"notifRemedyId";
UILocalNotification  *localnotif=[[UILocalNotification alloc]init];

NSDictionary *userDict = [NSDictionary dictionaryWithObjectsAndKeys:@"kRemindMeNotificationRemedyIDKey", kRemindMeNotificationRemedyIDKey,YOUR_REMEDYID,@"notifRemedyId",nil];
localnotif.userInfo = userDict;
[[UIApplication sharedApplication] scheduleLocalNotification:localnotif];

取消为：

for (UILocalNotification *aNotif in [[UIApplication sharedApplication] scheduledLocalNotifications]) 
    if ([[aNotif.userInfo objectForKey: kRemindMeNotificationRemedyIDKey] isEqualToString:@"kRemindMeNotificationRemedyIDKey"]) 
        if (remedyId == [[aNotif.userInfo objectForKey: kRemindMeNotificationRemedyIDKey] intValue]) 
            [[UIApplication sharedApplication] cancelLocalNotification:aNotif];
            break;
        
    

希望对你有帮助。

【讨论】：

是否必须将通知作为参数传递，或者它可以是remediateID ..因为我正在传递remediateID 因为如果remediateID 与notificationID 相同，那么我正在取消通知..但我仍然收到通知

我正在比较remediateID 和notifRemedyID .. EDIT 中的第一个代码我应该在schedulenotification 中添加它并在我的取消通知方法中使用第二个代码吗？我已经添加了我的 scheduleNotification 方法