CODEWITHSUNDEEP
objective-ccproperties
Atomix
Atomix

Reputation: 13842

ObjC accessing properties within C function

Why can't I access properties of my class from within a C function? This is what I mean:

Image

This is my code:

@interface MandelGenerator : NSWindow <NSWindowDelegate>
{
    //Displays the image
    IBOutlet JSImageView *imageView;
}
@end

/

#import "MandelGenerator.h"

@implementation MandelGenerator

void test(void) {
    imageView = nil;
}

@end

Upvotes: 1

Views: 72

Answers (1)

Ben Pious
Ben Pious

Reputation: 4805

A C function, unlike the instance method of a class, has no association with an Objective-C class. Just being in the same .m file as the class means nothing -- unlike an instance method, which is called on an instance by means of sending a message to it (thus providing the context necessary to know which imageView of all the imageViews that might exist as properties of instances of MandelGenerators), a C function isn't called on anything and can only "see" global variables and variables that are passed in to it as parameters. If you want this to work, you would need to change that C method to 

 void test(MandelGenerator* generator) {
     generator.imageView = nil;
}

Assuming that imageView is actually a property (it looks like an ivar to me).

Upvotes: 3

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