Swift版获取当前年、月、日

        var dateFormatter:NSDateFormatter = NSDateFormatter();
        dateFormatter.dateFormat = "yyyy/MM/dd";
        var dateString:String = dateFormatter.stringFromDate(NSDate());
        var dates:[String] = dateString.componentsSeparatedByString("/")
        currentYear  = dates[0].toInt()!
        currentMonth = dates[1].toInt()!
        currentDay   = dates[2].toInt()!