Local notification with a specific day in iOS8 - ios

Question

I want display local notification on my app in a specific day, for example, I want the notification is displayed all the 1 of the month.
I have this code, how can I customize it ?
//LOcal Notification
NSDate *today = [NSDate new];
NSCalendar *gregorian =
[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *offsetComponents = [NSDateComponents new];
[offsetComponents setDay:???];
[offsetComponents setHour:10];
[offsetComponents setMinute:0];
NSDate *thedate = [gregorian dateByAddingComponents:offsetComponents
toDate:today options:0];
UILocalNotification* localNotification = [[UILocalNotification alloc] init];
localNotification.fireDate = thedate;
localNotification.alertBody = #"Hey, il serait temps de faire un point non ? \ue104";
localNotification.timeZone = [NSTimeZone defaultTimeZone];
[[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
//END
There is too a depreciated error with ios8 on the gregorian calendar, how can I resolve it ?

Answer 1

//assuming you want to fire the notifiaction on 1st of every month.
NSInteger desiredWeekday = 1;// it specifies on which day of month
NSRange weekDateRange = [[NSCalendar currentCalendar] maximumRangeOfUnit:NSWeekdayCalendarUnit];
NSInteger daysInWeek = weekDateRange.length - weekDateRange.location + 1;
NSDateComponents *dateComponents = [[NSCalendar currentCalendar] components:NSWeekdayCalendarUnit fromDate:[NSDate date]];
NSInteger currentWeekday = dateComponents.weekday;
NSInteger differenceDays = (desiredWeekday - currentWeekday + daysInWeek) % daysInWeek;
NSDateComponents *daysComponents = [[NSDateComponents alloc] init];
daysComponents.day = differenceDays;
NSDate *resultDate = [[NSCalendar currentCalendar] dateByAddingComponents:daysComponents toDate:[NSDate date] options:0];
UILocalNotification* localNotification = [[UILocalNotification alloc] init];
localNotification.fireDate = resultDate;
localNotification.alertBody = #"Hey, il serait temps de faire un point non ? \ue104";
localNotification.timeZone = [NSTimeZone defaultTimeZone];
localNotification.repeatInterval = NSMonthCalendarUnit;// repeat notifiaction after a month
[[UIApplication sharedApplication] scheduleLocalNotification:localNotification];