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我安排了一个通知，并在它显示警报消息之前给它 60 分钟的警告......

一旦我添加通知，我的 App Delegate 中的方法就会被调用：

- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification

我怎么知道它会在后台显示为警报？是否有任何其他委托方法我需要覆盖或使用以确保给定具有 60 分钟间隔的预定警报...

- (void)scheduleNotificationWithItem:(NSDate *)item interval:(int)minutesBefore
{   
    NSCalendar *calendar = [NSCalendar autoupdatingCurrentCalendar];

    NSDateComponents *dateComps = [[NSDateComponents alloc] init];
    //NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

    NSDateComponents *currentDateComponents = [calendar components:( NSWeekdayCalendarUnit | 
                                                                     NSYearCalendarUnit | NSMonthCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSWeekCalendarUnit | NSMinuteCalendarUnit) fromDate:item];

    NSLog(@"- current components year = %i , month = %i , week = % i, weekday = %i", [currentDateComponents year], [currentDateComponents month], [currentDateComponents week], [currentDateComponents weekday]);

    NSLog(@"[currentDateComponents minute]: %i",    [currentDateComponents minute]);
    NSLog(@"[currentDateComponents hour]: %i",      [currentDateComponents hour]);
    NSLog(@"[currentDateComponents day]: %i",       [currentDateComponents day]);
    NSLog(@"[currentDateComponents week]: %i",      [currentDateComponents week]);
    NSLog(@"[currentDateComponents month]: %i",     [currentDateComponents month]);
    NSLog(@"[currentDateComponents year]: %i",      [currentDateComponents year]);

    [dateComps setDay: [currentDateComponents day]];

    [dateComps setMonth:[currentDateComponents month]];

    [dateComps setYear:[currentDateComponents year]];

    [dateComps setHour:[currentDateComponents hour]];

    [dateComps setMinute:[currentDateComponents minute]];

    NSDate *itemDate = [calendar dateFromComponents:dateComps];

    [dateComps release];

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

    if (localNotif == nil)
        return;

    localNotif.fireDate = [itemDate addTimeInterval:-(minutesBefore*60)];

    localNotif.timeZone = [NSTimeZone defaultTimeZone];

    localNotif.alertBody = [NSString stringWithFormat:@"%@\n%@",
                            streetAddress,
                            stringOfWhenAuctionIsOn];

    localNotif.alertAction = NSLocalizedString(@"View Details", nil);

    localNotif.soundName = UILocalNotificationDefaultSoundName;

    localNotif.applicationIconBadgeNumber = 1;

    NSDictionary *infoDict = [NSDictionary dictionaryWithObject:streetAddress
                                                         forKey:idOfStreetAlert];

    localNotif.userInfo = infoDict;

    [[UIApplication sharedApplication] scheduleLocalNotification:localNotif];
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2 回答 2

1

如果通知立即显示，则您的 fireDate 属性可能有问题。看起来您正在尝试验证发送的日期是否正确，但您还应该验证 fireDate 是否符合您的预期。

另外，你也许可以做

localNotif.fireDate = [item dateByAddingTimeInterval:-60*minutesBefore];

达到同样的效果，不必乱来NSDateComponents。我没有对此进行测试，但它可能会起作用。

至于当计时器触发并且您的应用程序未运行时会发生什么。如果应用程序没有被终止application:didReceiveLocalNotification:将被调用。如果在另一边您的应用程序已被终止，您需要按照application:didFinishLaunchingWithOptions:@Ishu 的指示签入。我通常只是将通知传递给常用方法以避免重复代码。

于 2011-02-16T08:10:07.740 回答
0

后台没有委托方法，需要在didFinishLaunchingWithOptions中写代码，

UILocalNotification *localNotif =
    [launchOptions objectForKey:UIApplicationLaunchOptionsLocalNotificationKey];

    if (localNotif) {
        //your code
        NSLog(@"Recieved Notification %@",localNotif);
    }

当应用程序从后台收到通知时，它会创建您的逻辑。不要担心应用程序会收到您设置通知的通知。

于 2011-02-16T04:14:11.347 回答