Objective C: How to inherit loaded category methods in a parent class?

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In my project, I am using the NSObject+Properties.h category (see aqtoolkit: https://github.com/AlanQuatermain/aqtoolkit/blob/master/Extensions/NSObject%2BProperties.h)

I then have a class that I declare as

#import <Foundation/Foundation.h>
#import "NSObject+Properties.h"

@interface GFDictionaryInitiable : NSObject
...

I then have several subclasses of GFDictionaryInitiable, such as GFRestaurant:

#import <Foundation/Foundation.h>

#import "GFDictionaryInitiable.h"

@interface GFRestaurant : GFDictionaryInitiable
...

My problem is that I cannot access methods defined in the NSObject+Properties category in my subclasses. For example I get the error:

-[GFRestaurant hasPropertyNamed:]: unrecognized selector sent to instance 0x2e57240

How can I have all my subclasses 'inherit' the category's methods that are loaded in the parent class?


As you get a runtime exception, and not a compiler error, I assume that you forgot to add "NSObject+Properties.m" to your target. Select the file and check the "Target Membership" checkbox in the File inspector.