Question

在我的应用程序中使用UILocalNotifications.But我的要求是，我想取消重复的通知。

这里我的代码是.....

-(void)LocalNotificationMethod{
    NSCalendar *calendar = [NSCalendar autoupdatingCurrentCalendar];

    // Get the current date
    NSDate *pickerDate =  self.selectedDate;
    NSLog(@" self.selectedDate %@", self.selectedDate);
    // Break the date up into components
    NSDateComponents *dateComponents = [calendar components:( NSYearCalendarUnit | NSMonthCalendarUnit |  NSDayCalendarUnit )
                                                   fromDate:pickerDate];
    NSDateComponents *timeComponents = [calendar components:( NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit )
                                                   fromDate:pickerDate];

    // Set up the fire time
    NSDateComponents *dateComps = [[NSDateComponents alloc] init];
    [dateComps setDay:[dateComponents day]];
    [dateComps setMonth:[dateComponents month]];
    [dateComps setYear:[dateComponents year]];
    [dateComps setHour:[timeComponents hour]];
    // Notification will fire in one minute
    [dateComps setMinute:[timeComponents minute]];
    [dateComps setSecond:[timeComponents second]];
    NSDate *itemDate = [calendar dateFromComponents:dateComps];

    NSLog(@"itemDate %@",itemDate);
    UILocalNotification *localNotif = [[UILocalNotification alloc] init];
    if (localNotif == nil)
        return;
    localNotif.fireDate = itemDate;
      NSLog(@"itemDate %@", localNotif.fireDate);
    localNotif.timeZone = [NSTimeZone defaultTimeZone];

    // Notification details
    localNotif.alertBody = [_titleTextFieldObj text];
    // Set the action button
    localNotif.alertAction = @"View";

    localNotif.soundName = UILocalNotificationDefaultSoundName;
    localNotif.applicationIconBadgeNumber =[[UIApplication sharedApplication] applicationIconBadgeNumber] + 1;

    NSLog(@" localNotif.applicationIconBadgeNumber ++ %ld", (long)localNotif.applicationIconBadgeNumber );



    // Specify custom data for the notification
    NSDictionary *infoDict = [NSDictionary dictionaryWithObject:[_titleTextFieldObj text] forKey:@"someKey"];

    localNotif.userInfo = infoDict;
    NSArray *notificationArray = [[UIApplication sharedApplication] scheduledLocalNotifications];
    //UILocalNotification *notif = [notificationArray objectAtIndex:indexPath.row];
    NSLog(@"notif %@",notificationArray);


    [[UIApplication sharedApplication] scheduleLocalNotification:localNotif];


   }

我是Objective-c的新手。我不知道在哪里写代码不允许重复通知。任何人都可以帮我解决这个问题。

先谢谢..

Answer 1

本地通知具有userInfo属性，您可以使用该属性放置一些自定义信息，并可用于配对通知。我建议您使用此信息插入包含通知类型的NSDictionary。例如：

NSString *newNotificationType = @"my_notification";
newNotification.userInfo = @{@"notification_type_key":newNotificationType};

然后，在您实施此操作后，您可以创建一个检查，如果此类通知已存在，并取消上一个或取消创建新通知：

for(UILocalNotification *notification in [[UIApplication sharedApplication] scheduledLocalNotifications])
{
    NSDictionary *userInfo = notification.userInfo;
    if([userInfo isKindOfClass:[NSDictionary class]] && [userInfo[@"notification_type_key"] isEqualToString:newNotificationType])
    {
        [[UIApplication sharedApplication] cancelLocalNotification:notification];
    }
}

如何避免ios中的重复UILocalNotification？

1 个答案: