How set the value kCFCalendarUnitWeekday

i want to set the value kCFCalendarUnitWeekday by using button and these value can pass the notification . I want to set alarm a particular day 开发者_高级运维for eg. (mon,tue,sat for every week).

kCFCalendarUnitWeekday is a constant that you should not modify. I don't quite understand what you want to do, but it sounds like you should take a look at NSDate, NSDateComponents and NSTimer.