ARC + Retain Hack

arc+retain.m

- (id)swizzled_retain
{
    NSLog(@"yes, I know");
    return [self swizzled_retain];
}

+ (void)load
{
    // swizzle retain
    Class c = [self class];
    SEL originalSelector = NSSelectorFromString(@"retain");
    SEL newSelector = @selector(swizzled_retain);
    
    Method origMethod = class_getInstanceMethod(c, originalSelector);
    Method newMethod = class_getInstanceMethod(c, newSelector);
    if(class_addMethod(c, originalSelector, method_getImplementation(newMethod), method_getTypeEncoding(newMethod)))
        class_replaceMethod(c, newSelector, method_getImplementation(origMethod), method_getTypeEncoding(origMethod));
    else
        method_exchangeImplementations(origMethod, newMethod);
}