本地通知" didReceiveLocalNotification"打电话两次

我使用以下方式处理本地通知：

I am handling local notifications using:

- (void)application:(UIApplication *)app didReceiveLocalNotification:(UILocalNotification *)notif

并安排本地通知：

- (void)scheduleNotificationWithInterval:(int)minutesBefore {
    UILocalNotification *localNotif = [[UILocalNotification alloc] init];

    if (localNotif == nil)
        return;

    NSDate *fireDate = [NSDate date];
    localNotif.fireDate = [fireDate dateByAddingTimeInterval:minutesBefore*60];
    localNotif.timeZone = [NSTimeZone defaultTimeZone];
    localNotif.repeatInterval = kCFCalendarUnitMinute;
    localNotif.alertBody = [NSString stringWithFormat:NSLocalizedString(@"LocalEvent notification in %i minutes.", nil),minutesBefore];
    localNotif.alertAction = NSLocalizedString(@"View Details", nil);
    localNotif.applicationIconBadgeNumber = 1;

    NSDictionary *infoDict = [NSDictionary dictionaryWithObjectsAndKeys:@"This is dict, you can pass info for your notification",@"info",nil];
    localNotif.userInfo = infoDict;

    [[UIApplication sharedApplication] scheduleLocalNotification:localNotif];

    [localNotif release];
    NSLog(@"Event scheduled");
}

当我收到通知时， didReceiveLocalNotification：被调用两次。

When I receive a notification, didReceiveLocalNotification: is called twice.

我做错了什么？

请帮助。

谢谢。