Question

我有一个应用程序，每隔x分钟通过UNNotification本地通知提醒用户。如果用户没有响应，则iOS锁定屏幕会显示一系列要求用户响应的横幅。大多数情况下，当应用程序处于后台时，用户点击横幅（点按“主页”按钮后）会触发UNNotification中心代表。但是，偶尔用户点击最新横幅不会触发代理 e。注意：这不是关于代表没有接到电话而没有用户点击的问题：我知道这不能做到。当用户点击横幅中的操作按钮时，为什么iOS不会偶尔触发应用委托？注意：我会跟踪待处理的本地通知的数量，并且永远不会超过64的系统限制。

App代表：

-(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);
    }
}];
}

查看控制器：

export default {
 name: 'GameMain',
 data () {
  return {
   lettersArray: [],
   activeKey: null
  }
 },
 methods: {
  typing: function () {
    this.lettersArray.push(this.activeKey)
    this.activeKey = null
  }
 }
}

Answer 1

我相信我发现了问题（这是我的代码）。我用相同的日期组件调用了triggerNotification两次（我只对分钟粒度感兴趣，因为我用它在第x分钟触发警报）。第一个调用是用户按下开始按钮，第二个调用是在app delegate中调用applicationDidBecomeActive时。事实上，我确实在我的表中看到了重复的通知。我认为，但无法证明，当系统有两个UNNotificationRequests等待同一日期组件时，它只响应一个相应的警报标语。因此，当我点击最新的横幅时，代表没有被调用。我删除了第二个触发器，问题似乎得到解决（即，点击横幅中的按钮会导致对我的代理人的调用）。注意：即使我为相同的日期组件触发了两次通知，我也确实在每个请求中提供了一个唯一标识符。

UNNotification本地通知用户点击不会在后台iOS 11中的应用程序时触发委托

1 个答案: