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

Swift 3 extension:

extension Date {
    public func isLeapYear() -> Bool {
        let components = Calendar.current.dateComponents([.year], from: self)

        guard let year = components.year else { return false }

        return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)
    }
}