[英]Can there be more than one outstanding UNNotificationRequest?
我的应用为将来的时间安排了多个UNNotificationRequest。 每个请求都有一个唯一的标识符。 这不是在UNCalanderNotificationTrigger上重复的情况,因为重复设置为NO。 而是,每个请求都设置为一个不同的未来日历日期,但是它们都是在实质上同时串行发送的。 每个触发器由传递给以下方法的间隔(NSTimeInterval)设置。 当应用程序在后台或前台时,UNNotificationCenter委托(appDelegate)随后都不会收到任何请求。 Apple的Developer文档中都没有相关示例。 我想知道是否应该在完成处理程序中检查是否完成(我的代码具有withCompletionHandler:nil,但这就是苹果示例中显示的内容)。
-(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;
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;
}
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