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我怎么能每分钟运行一个功能？在JavaScript中我可以做类似的事情setInterval,在Swift中存在类似的东西吗？

通缉输出:

你好世界每分钟一次......

在UILocalNotification我们使用NSCalendarUnitMinute像重复.....但我在iOS 10 UserNotification doc中找不到...我怎样才能NSCalendarUnitMinute在iOS 10中使用类似的重复UserNotification？

这是代码,它将在晚上8:30安排本地通知,并在每一分钟后重复.

UILocalNotification* localNotification = [[UILocalNotification alloc] init];
localNotification.fireDate = pickerDate;
localNotification.alertBody = self.textField.text;
localNotification.timeZone = [NSTimeZone defaultTimeZone];
localNotification.repeatInterval = NSCalendarUnitMinute;
localNotification.applicationIconBadgeNumber = [[UIApplication sharedApplication] applicationIconBadgeNumber] + 1;
[[UIApplication sharedApplication] scheduleLocalNotification:localNotification];

我正在努力audio/video call并尝试将来电呼叫notification循环播放1分钟,就像WhatsApp在iOS应用程序是背景时显示,Notification banner隐藏并显示铃声1分钟.

我试过这段代码,它只触发一次:

 UNMutableNotificationContent *content = [[UNMutableNotificationContent alloc] init];
    content.title = [NSString stringWithFormat:@"Video Call from %@",userId];
    content.body = @"";
    content.userInfo = [userInfo mutableCopy];
    content.sound = [UNNotificationSound soundNamed:@""];

    NSDate *now = [NSDate date];
    now = [now dateByAddingTimeInterval:3];
    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    [calendar setTimeZone:[NSTimeZone localTimeZone]];

    NSDateComponents *components = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond|NSCalendarUnitTimeZone fromDate:now];

    UNCalendarNotificationTrigger *trigger = [UNCalendarNotificationTrigger triggerWithDateMatchingComponents:components repeats:NO];
    UNNotificationRequest * request = [UNNotificationRequest requestWithIdentifier:@"INCOMING_VOIP_APN" content:content trigger:trigger];

    UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
    center.delegate …