Convert FSCalendar into islamic Umm Al-qura calendar in swift

I am trying to make Islamic/Hijri calendar using FSCalendar library in which months and date should show according to Islamic month and date. So far i have tried

    dateFormatter.locale = NSLocale(localeIdentifier: "en_US") as Locale
    let GregorianDate = dateFormatter.date(from: "13-07-2016")
    let islamic = NSCalendar.init(calendarIdentifier: .islamicUmmAlQura)
    let components = (islamic?.components(NSCalendar.Unit(rawValue: UInt.max), from: GregorianDate!))!
    let date = NSCalendar.current.date(from: components)!
    hijriCalendar.setCurrentPage(date, animated: true)

but no luck. can i get some guide for this conversion