Is it possible to scope enums to a class in Objective-C?

Question

I'm new to Objective-C and trying to figure out enums. Is there a way to scope an enum to a class so that the values could be used by another class? Something like this:

@interface ClassA {
    typedef enum {
        ACCEPTED,
        REJECTED
    } ClassAStatus;
}
@end

@interface ClassB {
    typedef enum {
        ACCEPTED,
        REJECTED
    } ClassBStatus;
}
@end

Though that does not work, obviously. Or is there a better way to do enums altogether?

Edit: I guess my wording wasn't clear, but I'm not asking how to declare enums. I'm aware that putting them at the top of the file works. I'm asking if there's a way to scope them so the values aren't global to the entire file.

Answer 1

You have to prefix your public enums. Simply put the enum definition in the header of your class.

// ClassA.h
typedef enum {
    ClassAStatusAccepted,
    ClassAStatusRejected
} ClassAStatus;

@interface ClassA {
    ClassAStatus status;
}
@end


// ClassB.h
typedef enum {
    ClassBStatusAccepted,
    ClassBStatusRejected
} ClassBStatus;

@interface ClassB {
    ClassBStatus status;
}
@end

This is how Apple does it.

Or you could use the new style:

// UIView.h
typedef NS_ENUM(NSInteger, UIViewAnimationCurve) {
    UIViewAnimationCurveEaseInOut,         // slow at beginning and end
    UIViewAnimationCurveEaseIn,            // slow at beginning
    UIViewAnimationCurveEaseOut,           // slow at end
    UIViewAnimationCurveLinear
};