可以有多个未完成的 UNNotificationRequest 吗？

Posted 2023-02-24

【中文标题】可以有多个未完成的 UNNotificationRequest 吗？

【英文标题】：Can there be more than one outstanding UNNotificationRequest?

【发布时间】：2017-11-07 00:17:09

【问题描述】：

我的应用为未来时间安排了多个 UNNotificationRequest。每个请求都有一个唯一标识符。这不是在 UNCalanderNotificationTrigger 上重复的情况，因为重复设置为 NO。相反，每个请求都设置为不同的未来日历日期，但它们都是连续请求的，而且基本上是同时请求的。每个触发器由传入以下方法的间隔 (NSTimeInterval) 设置。 UNNotificationCenter 委托 (appDelegate) 随后不会收到任何请求，无论是应用程序在后台还是前台。 Apple 的开发人员文档都没有相关示例。我想知道我是否应该在完成处理程序中检查完成（我的代码有 withCompletionHandler: nil，但这就是 Apple 示例中显示的内容）。

    -(UNNotificationRequest *)triggerNotifications: (NSString *)identifier : (NSTimeInterval) interval
    // Note: identifier must be unique or else each new request causes all others to be cancelled.
    NSLog(@"interval: %f", interval);
    UNUserNotificationCenter* center = [UNUserNotificationCenter currentNotificationCenter];
    UNMutableNotificationContent* content = [[UNMutableNotificationContent alloc] init];
    content.title = NSLocalizedString(@"Timer expired", nil);
    content.body = NSLocalizedString(@"Touch to continue", nil);
    content.sound = [UNNotificationSound defaultSound];
    content.categoryIdentifier = @"com.nelsoncapes.localNotification";
 //   NSDate *today = [NSDate date];
 //   NSDate *fireDate = [today dateByAddingTimeInterval:interval];
    NSDate *fireDate = [NSDate dateWithTimeIntervalSinceNow:interval];
    // first extract the various components of the date
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSInteger hour = [calendar component:NSCalendarUnitHour fromDate:fireDate];
    NSInteger minute = [calendar component:NSCalendarUnitMinute fromDate:fireDate];
    NSInteger second = [calendar component:NSCalendarUnitSecond fromDate:fireDate];
    //then make new NSDateComponents to pass to the trigger
    NSDateComponents *components = [[NSDateComponents alloc]init];
    components.hour = hour;
    components.minute = minute;
   // components.second = second;
    // construct a calendarnotification trigger and add it to the system
    UNCalendarNotificationTrigger *trigger = [UNCalendarNotificationTrigger triggerWithDateMatchingComponents:components repeats:NO];
    UNNotificationRequest *request = [UNNotificationRequest requestWithIdentifier: identifier content:content trigger:trigger];
    NSLog(@"request: %@", request);
    [center addNotificationRequest:request withCompletionHandler:nil];
    return request;

【参考方案1】：

答案是“是”，可以有多个未完成的 NSNotificationRequest。以下代码有效：

   -(UNNotificationRequest *)triggerNotifications: (NSString *)identifier : (NSTimeInterval) interval
    // Note: identifier must be unique or else each new request causes all others to be cancelled.
    UNUserNotificationCenter* center = [UNUserNotificationCenter currentNotificationCenter];
    UNMutableNotificationContent* content = [[UNMutableNotificationContent alloc] init];
    content.title = NSLocalizedString(@"Timer expired", nil);
    content.body = NSLocalizedString(@"Touch to continue", nil);
    NSUserDefaults *storage = [NSUserDefaults standardUserDefaults];
    BOOL sound = [storage boolForKey:@"sound permission granted"];
    if(sound)
        if([self.selectedSound isEqual:NSLocalizedString(kselectedSoundKeyDoorBell, nil)])
            content.sound = [UNNotificationSound soundNamed:@"doorbell.caf"];
        else if ([self.selectedSound isEqual:NSLocalizedString(kselectedSoundKeySystemDefault, nil)])
            content.sound = [UNNotificationSound defaultSound];
        else if ([self.selectedSound isEqual:NSLocalizedString(kselectedSoundKeyElectronicChime, nil)])
            content.sound = [UNNotificationSound soundNamed:@"electronic_chime.caf"];
        else
            if([self.selectedSound isEqual:NSLocalizedString(kselectedSoundKeyComputer, nil)])
                content.sound = [UNNotificationSound soundNamed:@"Computer.caf"];
            
        
    
    content.categoryIdentifier = @"com.nelsoncapes.localNotification";
    NSDate *today = [NSDate date];
    NSDate *fireDate = [today dateByAddingTimeInterval:interval];
    // first extract the various components of the date
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSInteger year = [calendar component:NSCalendarUnitYear fromDate:fireDate];
    NSInteger month = [calendar component:NSCalendarUnitMonth fromDate:fireDate];
    NSInteger day = [calendar component:NSCalendarUnitDay fromDate:fireDate];
    NSInteger hour = [calendar component:NSCalendarUnitHour fromDate:fireDate];
    NSInteger minute = [calendar component:NSCalendarUnitMinute fromDate:fireDate];
    NSDateComponents *components = [[NSDateComponents alloc]init];
    components.year = year;
    components.month = month;
    components.day = day;
    components.hour = hour;
    components.minute = minute;

    // construct a calendarnotification trigger and add it to the system
    UNCalendarNotificationTrigger *trigger = [UNCalendarNotificationTrigger triggerWithDateMatchingComponents:components repeats:NO];
    UNNotificationRequest *request = [UNNotificationRequest requestWithIdentifier: identifier content:content trigger:trigger];
    [center addNotificationRequest:request withCompletionHandler:^(NSError *error)
        if(error)
        NSLog(@"error on trigger notification %@", error);
        
    ];
    return request;