iOS中计划的本地通知和时区更改

Question

I have this method in my app to fire scheduled local notifications:

- (void)scheduleNotificationForTime:(long long)atTime
{
   NSDate *fireDate = [DatesMngr getDateFromLongLong:atTime];

   UILocalNotification *localNotif = [[UILocalNotification alloc] init];
   if (localNotif == nil)
       return;
   localNotif.fireDate = fireDate;
   localNotif.timeZone = [NSTimeZone localTimeZone];

   localNotif.alertBody = @"Active Status";
   localNotif.alertAction = @"View Details";
   localNotif.applicationIconBadgeNumber = 1;

   [[UIApplication sharedApplication] cancelAllLocalNotifications];
   [[UIApplication sharedApplication] scheduleLocalNotification:localNotif];
}

It works fine if user does not change her timezone in her device's Settings, but the notification is not launched if she changes the timezone after it has been already scheduled but not launched yet. I've also tried with [NSTimeZone defaultTimeZone] with no success. Is there any way to detect these timezone changes and refresh the fireDate for already scheduled local notifications?

Thanks

Answer 1

You can do it in 2 ways

1. implement the following method in your appdelegate

• (void)applicationSignificantTimeChange:(UIApplication *)application

2 . Register for UIApplicationSignificantTimeChangeNotification in notificationcenter

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleTimeChange:)] ;