You are not allowed to actually have setters/properties on a category...

A trick is using associative objects , like:

...
-(void) setPipe:(id<NSObject>)pipe {
    // use better key...
    objc_setAssociatedObject(self, @"AGpipeCatKey", pipe, OBJC_ASSOCIATION_ASSIGN);
}

-(id<NSObject>)pipe {
     return objc_getAssociatedObject(self, @"AGpipeCatKey"); // use better key...
}
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