Question

为我的应用程序启用local notifications相当困难。

是的，我在应用程序关闭一个一周后，我想用一个local notification女巫设置我的项目。例如，如果用户在星期六8日打开应用程序，则本地通知应出现在15日的下一个星期六，但时间应该更改。例如，他/她在晚上8点关闭应用程序，我不想在下周8点打扰他们，所以我想在下午6点或类似的地方显示每个通知。

现在你知道我的问题，这是我正在使用的代码：

- (void)applicationDidEnterBackground:(UIApplication *)application
{
    [[UIApplication sharedApplication] cancelAllLocalNotifications];

    NSCalendar *calendar = [NSCalendar autoupdatingCurrentCalendar] ;
    NSDateComponents *componentsForReferenceDate = [[NSDateComponents alloc] init];

    //set day (saturday)

    [componentsForReferenceDate setDay:26] ;
    [componentsForReferenceDate setMonth:1] ;
    [componentsForReferenceDate setYear:2013] ;

    [componentsForReferenceDate setHour: 17] ;
    [componentsForReferenceDate setMinute:30] ;
    [componentsForReferenceDate setSecond:00] ;

    NSDate *fireDateOfNotification = [calendar dateFromComponents: componentsForReferenceDate];

    // Create the notification

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


    notification.fireDate = fireDateOfNotification ;
    notification.timeZone = [NSTimeZone localTimeZone] ;
    notification.alertBody = [NSString stringWithFormat: @"Du wirst vermisst! \nDeine App braucht dich, schreibe sie zu Ende!"] ;
    notification.alertAction = @"Zurückkehren";
    notification.userInfo= [NSDictionary dictionaryWithObject:[NSString stringWithFormat:@"Some information"] forKey:@"information"];
    notification.repeatInterval= NSWeekCalendarUnit ;
    notification.soundName = @"Appnotifisound.wav";
    notification.applicationIconBadgeNumber = 1;
    [[UIApplication sharedApplication] scheduleLocalNotification:notification] ;

}

我知道必须有更多方法来删除徽章和didrecievenotification，但我放弃了它们，因为不对此非常重要。

使用此代码，我设法在每个星期六下午5:30 （德国）安排通知。但我只想安排一次，当应用程序已关闭完全一个周。这有可能吗？如果有人能够纠正我的代码或给我一个解决方案，我会很高兴。

致以最诚挚的问候，感谢您阅读这篇长篇文章，

诺亚

Answer 1

您应该取消预先安排通知。

for (UILocalNotification *lNotification in [[UIApplication sharedApplication] scheduledLocalNotifications]) 
    {
        if ([[lNotification.userInfo valueForKey:@"information"] isEqualToString:@"Some information"])
        {
            [[UIApplication sharedApplication]cancelLocalNotification:lNotification];
            break;
        }
    }

通过以下方式设置开火日期：

NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *componentsForReferenceDate = [calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit)
                                     fromDate:[NSDate date]];
    [componentsForReferenceDate setHour: 17] ;
    [componentsForReferenceDate setMinute:30] ;
    [componentsForReferenceDate setSecond:00] ;

    NSDate *tempDate = [calendar dateFromComponents: componentsForReferenceDate];
    [componentsForReferenceDate release];

    NSDateComponents *comps = [[NSDateComponents alloc]init];
    [comps setDay:7];
    NSDate *fireDateOfNotification = [calendar dateByAddingComponents:comps
                                                               toDate:tempDate options:0]
    [comps release];

Answer 2

notification.repeatInterval = NSWeekCalendarUnit导致此问题。使用方法：

notification.repeatInterval = 0;

这可以防止重复（source）。

Answer 3

这是 Swift 2.0 改编

取消安排当前通知

    for notifMe:AnyObject in UIApplication.sharedApplication().scheduledLocalNotifications!{
        let title = notifMe.userInfo["information"] as? String
        if title == "some information"{
                UIApplication.sharedApplication().cancelLocalNotification(notifMe as! UILocalNotification)
        }
        }

设置通知日期

    let date = NSDate()
    let calendar = NSCalendar.currentCalendar()
    let components = calendar.components(NSCalendarUnit.Year.union(NSCalendarUnit.Month).union(NSCalendarUnit.Day),fromDate: date)
    components.hour = 17
    components.minute = 30
    components.second = 00

    let tempDate = calendar.dateFromComponents(components)!
    let comps = NSDateComponents()
    comps.day = 7
    let fireDateOfNotification = calendar.dateByAddingComponents(comps, toDate: tempDate, options:[])

应用程序关闭7天后安排本地通知

3 个答案: