取消UILocalNotification

Question

目前，我正试图取消与数据模型中的对象关联的特定UILocalNotifications。为此，每个数据对象都有一个唯一的标识符，即NSUUID。

创建UILocalNotification:

/* Set UILocalNotification */
        UILocalNotification *localNotification = [[UILocalNotification alloc] init];
        localNotification.fireDate = date;
        localNotification.alertBody = self.mytextfield.text;
        localNotification.soundName = UILocalNotificationDefaultSoundName;
        localNotification.applicationIconBadgeNumber = 1;
        NSLog(@"making a notification: %@",[r.uniqueId UUIDString]);
        [localNotification.userInfo setValue:[r.uniqueId UUIDString] forKey:@"uid"];
        [[UIApplication sharedApplication] scheduleLocalNotification:localNotification];

然而，当我删除通知并打印出每个通知内容时，通知的alertbody将被正确打印，但是唯一的标识符不知何故丢失了。这个实现有什么问题？

Cancel UILocalNotification:

Obj *r = (Obj *)[self.objects[indexPath.section] objectAtIndex:indexPath.row];

    /* Cancel UILocalNotification */
    NSArray *scheduleReminders = [[UIApplication sharedApplication] scheduledLocalNotifications];
    NSLog(@"scheduled.count: %i",(int)scheduleReminders.count); // Correctly prints 3
    for (int i = 0; i < scheduleReminders.count; i++)
    {
        UILocalNotification *notification = scheduleReminders[i];

        NSDictionary *userInfoCurrent = notification.userInfo;
                NSLog(@"searching through reminders: %i %@ %@ %@",(int)i,[userInfoCurrent objectForKey:@"uid"], notification.alertBody); // Alert body prints correctly

        if ([[userInfoCurrent valueForKey:@"uid"] isEqualToString:[r.uniqueId UUIDString]])
        {
            NSLog(@"found it");
            //Cancelling local notification
            [[UIApplication sharedApplication] cancelLocalNotification:notification];
            break;
        }
    }

Answer 1

问题是，默认情况下，userInfo是“零”。您应该分配您自己的NSDictionary，设置uid，然后将此字典设置为localNotification.userInfo。