Modern enum en Objective-C

archivo.m

// http://objective-c.es/modern-objective-c-enum/
// http://nshipster.com/ns_enum-ns_options/

typedef NS_ENUM(NSUInteger, GBDaysOfWeek) {
    GBSunday,
    GBMonday,
    GBTuesday,
    GBWednesday,
    GBThursday,
    GBFriday,
    GBSaturday
};