UILocalNotification repeatInterval on 20 days - ios

Question

I'd like to create local notification with custom interval repeat (every 20 days for example).
I know we have NSDayCalendarUnit, kCFCalendarUnitMonth ... but I hope to set repeat interval at 20 days.
I don't want to create a notification for every day.
My real need is to repeat a notification for consecutive 21 days, then don't launch it for 7 days later, then a new 21 days with notification and 7 days without ... etc.
I should schedule all these days even if application is inactive.
To do this I decide to create a 21 notifications since a fire date with repeatInterval = 28days (here is the problem)

Answer 1

Try this, you can change the intervall by selecting setDay, setMonth, .... :
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [[NSDateComponents alloc] init];
[components setDay:3];
NSDate *date3Days = [calendar dateByAddingComponents:components
toDate:[NSDate date]
options:0];
UIApplication* app = [UIApplication sharedApplication];
NSArray* oldNotifications = [app scheduledLocalNotifications];
if ( oldNotifications ) {
[app cancelAllLocalNotifications];
app.applicationIconBadgeNumber = 0;
}
UILocalNotification* notifyAlarm = [[UILocalNotification alloc] init];
if (notifyAlarm) {
notifyAlarm.fireDate = date3Days;
notifyAlarm.timeZone = [NSTimeZone defaultTimeZone];
notifyAlarm.alertBody = NSLocalizedString( #"Push message", #"");
notifyAlarm.soundName = #"sound.wav";
[app scheduleLocalNotification:notifyAlarm];
}
If you want to set a specific time after which the UILocalNotifications should appear you can create a method of the above solution and loop over an array which indicates the days you like to show a notification:
NSArray *arrayNumbers = #[#5, #7, #14, #21, #30, #60, #90, #120];
NSDictionary *dictNotifications =
[[NSUserDefaults standardUserDefaults] objectForKey:kUserDefAppStarts];
for ( NSNumber *bla in arrayNumbers ){
NSString *strKey = [NSString stringWithFormat:#"%#%#", kUserDefAppStarts, bla];
NSDictionary *dict = dictNotifications[strKey];
NSString *strMessageQuestion = dict[kKeyMessage];
[self createNotificationWithNumberOfDays:[bla integerValue]
andMessage:strMessageQuestion
userInfo:dict];
}
And here is the method you have to call
+ (void)createNotificationWithNumberOfDays:(int)days
andMessage:(NSString *)message
userInfo:(NSDictionary *)dict{
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [[NSDateComponents alloc] init];
[components setDay:days];
NSDate *dateAlert = [gregorian dateByAddingComponents:components toDate:[NSDate date] options:0];
UIApplication *app = [UIApplication sharedApplication];
UILocalNotification *notifyAlarm = [[UILocalNotification alloc] init];
if( notifyAlarm ){
[notifyAlarm setFireDate:dateAlert];
[notifyAlarm setTimeZone:[NSTimeZone defaultTimeZone]];
[notifyAlarm setSoundName:#"soundname"];
[notifyAlarm setAlertBody:message];
[notifyAlarm setUserInfo:dict];
[app scheduleLocalNotification:notifyAlarm];
}
}

Answer 2

If you wanted to schedule a UILocalNotification for 20 days in the future from the current time you would do this:
NSCalendar *currentCalendar = [NSCalendar currentCalendar];
NSDateComponents *dateComp = [[NSDateComponents alloc] init];
int desiredAmountOfMonths = 4;
for (int month = 0; month < desiredAmountOfMonths; month++)
{
dateComp.month = month;
dateComp.day = 20;
NSDate *fireDate = [currentCalendar dateByAddingComponents:dateComp toDate:[NSDate date] options:NSCalendarMatchNextTimePreservingSmallerUnits];
UILocalNotification *notification = [[UILocalNotification alloc] init];
notification.fireDate = fireDate;
notification.timeZone = [NSTimeZone defaultTimeZone];
}
You will need to modify the UILocalNotification for what message, sound, etc and then fire the notification once done customizing.