Why unloaded class is still accessible in Cocoa?

I loaded a class dynamically with [NSBundle load]. And unloaded it dynamically with [NSBundle unload]. Anyway it looks the class is still alive after unloading.

My code is:

// In separated bundle.
@implementation EEExampleBundle
+ (void)test
{
    NSLog(@"TTTTT");
}
@end




// In executable file.
#import <Foundation/Foundation.h>

int main (int argc, const char * argv[])
{
    @autoreleasepool 
    {
        id  EEExampleBundle         =   nil;

      开发者_如何学运维  @autoreleasepool 
        {   
            NSString*   path            =   [[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:@"EEExampleBundle.framework"];
            NSBundle*   sampleBundle    =   [NSBundle bundleWithPath:path];

            [sampleBundle load];


            EEExampleBundle     =   (id)[sampleBundle classNamed:@"EEExampleBundle"];

            [EEExampleBundle test];

            BOOL    r   =   [sampleBundle unload];
            NSLog(@"unload result = %d", r);
        }
        [EEExampleBundle test];
    }
    return 0;
}

The output is:

2011-09-25 01:08:52.713 driver[2248:707] TTTTT
2011-09-25 01:08:52.714 driver[2248:707] unload result = 1
2011-09-25 01:08:52.716 driver[2248:707] TTTTT

Why the class code is still working? Is this normal? Or should I do any extra step to unload the code completely?

P.S I'm not using ARC. I turned it off explicitly.

(more of a comment than an answer, nevertheless:) That's due to the inner @autoreleasepool block, no? You won't be able to create a new instance from your bundle, but you do keep the ones already created alive (else, that'd generate fancy bugs).