Is there a way to dynamically determine ivars of a class at runtime in Cocoa / Cocoa Touch?

cocoa, cocoa-touch, objective-c

Solution

You'd have to roll your own using the Objective-C Runtime functions. Here's some very basic sample code. Note that getting the ivars of a class doesn't get the ivars of its superclass. You'd need to do that explicitly, but the functions are all there in the runtime.

#import <objc/objc-runtime.h>
#include <inttypes.h>
#include <Foundation/Foundation.h>

@interface Foo : NSObject
{
    int i1;
}
@end
@implementation Foo
@end

@interface Bar : Foo
{
    NSString* s1;
}

@end
@implementation Bar
@end

int main(int argc, char** argv)
{
    NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];

    unsigned int count;
    Ivar* ivars = class_copyIvarList([Bar class], &count);
    for(unsigned int i = 0; i < count; ++i)
    {
        NSLog(@"%@::%s", [Bar class], ivar_getName(ivars[i]));
    }
    free(ivars);


    [pool release];
}

Problem

Original source