如何在 objc 中以重复间隔每 15 天触发一次 UILocalNotification

Question

我正在尝试在早上 6 点每隔 15 次重复触发一次 uilocalnotification。

我试过示例代码，但不确定如何在模拟器中测试它。

NSDate *now = [NSDate date];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay fromDate:now];
[components setHour:6];
[components setMinute:0];
[components setSecond:0];

// Gives us today's date but at 6am
NSDate *next6am = [calendar dateFromComponents:components];
NSLog(@"next9am BEFORE :%@",next6am);

if ([next6am timeIntervalSinceNow] < 0) {
    // If today's 6am already occurred, add 24hours to get to tomorrow's
    next6am = [next6am dateByAddingTimeInterval:60*60*24*15];
}

UILocalNotification* Localnotification = [[UILocalNotification alloc]init];

Localnotification.fireDate = next6am;
Localnotification.alertBody = @“it is been 15 days“;

Localnotification.repeatInterval = NSCalendarUnitWeekOfYear*2+NSCalendarUnitDay;
[[UIApplication sharedApplication] scheduleLocalNotification:Localnotification];

但不确定如何在模拟器中测试它，也不确定它是否有效帮助将不胜感激。

谢谢

Answer 1

本地通知适用于模拟器。但是，如果您想在应用程序处于前台时看到通知，请确保您在应用程序委托中实现了 application:didreceiveLocalNotification：

- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification{
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"MyAlertView" message:notification.alertBody delegate:self cancelButtonTitle:@"OK"
        otherButtonTitles:nil];
    [alertView show];
    if (alertView) {
        [alertView release];
    }
}

Answer 2

在互联网上进行大量搜索并尝试变通后，我了解到 iOS 重复间隔如下，

    NSCalendarUnitYear  // for every year              
    NSCalendarUnitMonth  // for every month          
    NSCalendarUnitDay     // for every day          
    NSCalendarUnitHour     // for every hour          
    NSCalendarUnitMinute  // for every minute
  and many more

我们只能按照上面的方式设置重复间隔。

但是如果我们想每 15 天重复一次间隔，我们需要为 UILocalNotification 编写一个自定义重复间隔。

所以每年有 12 个月，要安排的活动数量是 24，所以我循环了 2 年（730 天）并为接下来的 2 年安排了 48 场活动

下面是实现结果的代码

       UILocalNotification* Localnotification = [[UILocalNotification alloc]init];

       NSCalendar *calendar = [NSCalendar autoupdatingCurrentCalendar] ;
        NSDateComponents *components =
        [calendar components:(NSDayCalendarUnit | NSYearCalendarUnit | NSMonthCalendarUnit ) fromDate:[NSDate date]];

        [components setHour:6];
        [components setMinute:0];
        [components setSecond:0];
        // Gives us today's date
        NSDate *next6am = [calendar dateFromComponents:components];

        /*
         * Since every year has 365 days and
         */
        for (int i = 0; i<48; i++)//
        {
            next6am = [next6am dateByAddingTimeInterval:60*60*24*15];


            Localnotification.fireDate = next6am;

            //////add the userinfo for uilocal notification only after fire date. if called before the user info will not be updated.

            NSDictionary *infoDict = [NSDictionary dictionaryWithObject:[NSString stringWithFormat:@"15DaysAlerts"] forKey:@"notify"];
            Localnotification.userInfo = infoDict;

            if (CHECK_IOS_VERSION>8.2)
            {
                Localnotification.alertTitle = @"eKinCare";
            }
            Localnotification.alertBody = @"Any new medical reports to save?Touch to securely save & access anywhere, anytime.";
            // Set a repeat interval to monthly
            Localnotification.repeatInterval = NSCalendarUnitYear;
            [[UIApplication sharedApplication] scheduleLocalNotification: Localnotification];
            NSLog(@"next9am:%@",next6am);
        }

您可以使用以下方法查看所有已安排的活动

-(void)showScheduledNotifications
{
    UIApplication *app = [UIApplication sharedApplication];
    NSArray *eventArray = [app scheduledLocalNotifications];
    NSLog(@"Events array : %@",eventArray);
    int scheduled_15daysAlerts = 0;

    for (int i=0; i<[eventArray count]; i++)
    {
        UILocalNotification* oneEvent = [eventArray objectAtIndex:i];
        NSDictionary *userInfoCurrent = oneEvent.userInfo;
        NSString *uid=[NSString stringWithFormat:@"%@",[userInfoCurrent valueForKey:@"notify"]];
        if ([uid isEqualToString:@"15DaysAlerts"])
        {
            scheduled_15daysAlerts++;
            NSLog(@"yes found");
            //Cancelling local notification
        }
    }

    NSLog(@"Scheduled 15 days alert = [%d]",scheduled_15daysAlerts);
}

希望这对正在寻找解决方案的人有所帮助:)

Answer 3

在iOS 10中，您可以使用UNTimeIntervalNotificationTrigger安排每15天通知一次并重复（设置repeats: YES）。

UNTimeIntervalNotificationTrigger* trigger = [UNTimeIntervalNotificationTrigger triggerWithTimeInterval:(15*24*3600) repeats: YES];
NSLog(@"td %@", trigger.nextTriggerDate);

UNNotificationRequest *request = [UNNotificationRequest requestWithIdentifier:identifier content:content trigger:trigger];

[center addNotificationRequest:request withCompletionHandler:^(NSError * _Nullable error) {
    if (error != nil) {
        NSLog(@"Something went wrong: %@",error);
    } else {
        NSLog(@"Created! --> %@",request);
    }
}];

希望这对寻找此主题的任何人有所帮助。

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