Obj-C adding methods at runtime

Obj-C adding methods at runtime

+ (void)initialize {

	Class metaClass = objc_getMetaClass(class_getName(self));

	SEL selector = @selector(description);
	IMP implementation = imp_implementationWithBlock(^NSString *(){
		 return @">>>added";
	});
	Method method = class_getClassMethod(metaClass, selector);

	const char *type = method_getTypeEncoding(method);

	class_addMethod(metaClass, selector, implementation, type);
	class_addMethod(self, selector, implementation, type);

	NSLog(@"class description %@", [self description]);
	NSLog(@"instance description %@", [[self new] description]);
}