How do I calculate the number of days in this year in Objective C

Question

How can i calculate the number of days in a year for any calendar, not just gregorian. I have tried this

NSUInteger *days = [[NSCalendar currentCalendar] range

Answer 1

[[NSCalendar currentCalendar] ordinalityOfUnit:NSYearCalendarUnit
                                        inUnit:NSEraCalendarUnit forDate:date];