Pass value of kCFCalendarUnitWeekday - iphone

Question

I want to set an alarm on a particular day. I don't understand how to set the value of kCFCalendarUnitWeekday. Here is my code:
NSDateComponents *components = [[NSDateComponents alloc] init];
UILocalNotification *localNotif = [[UILocalNotification alloc] init];
if (localNotif == nil)
return;
localNotif.fireDate = selected;
localNotif.timeZone = [NSTimeZone defaultTimeZone];
localNotif.repeatCalendar = [NSCalendar currentCalendar];
if (isSun) {
[components setWeekday:1];
[localNotif setRepeatInterval:(NSInteger)components];
}
if (isMon) {
[components setWeekday:2];
[localNotif setRepeatInterval:(NSInteger)components];
}
Thank you.

Answer 1

Ok here is some code to get you in the right direction:
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [gregorian components:NSWeekdayCalendarUnit|NSYearCalendarUnit|NSDayCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit fromDate:[NSDate date]];
// this will set the weekday to sunday
[components setWeekday:1];
// this is a new date on sunday
NSDate * newDate = [gregorian dateFromComponents:components];
You still have to find out whether the newDate is in the past, so it won't fire.
You actually have your code ready:
// ... init code ...
// *** this the important date ***
localNotif.fireDate = dateOnASunday;
localNotif.timeZone = [NSTimeZone defaultTimeZone];
localNotif.repeatCalendar = NSWeekCalendarUnit;
... // add body etc. ...
[[UIApplication sharedApplication] scheduleLocalNotification:localNotif];
[localNotif release];
Create a method around this snippet and pass the date with a parameter so you can reuse it. You only have to put in a date which should be the first fire date and it'll repeat every week. You just have to pass in a date on a Sunday or Wednesday.
You set a repeat interval like this:
// repeats notification on a weekly basis
localNotif.repeatCalendar = NSWeekCalendarUnit;
The repeatCalender property is of type NSCalendarUnit which is an enum.