Re: Iterating over a classes methods?

FROM : John C. Randolph
DATE : Fri Dec 27 23:35:49 2002

On Monday, December 23, 2002, at 11:47 PM, Victor Ng wrote:

> Is there a way to iterate over the list of messages that an object
> will respond to?

I did it like this:  (slightly modified from an example that Erik Buck
posted here some time ago.)

NSArray *
methodNamesForClass(Class aClass)
  {
  Class
    class = aClass;

  NSMutableArray
    *methodNames = [NSMutableArray array];
//    *methodNames = (class->super_class ?
methodNamesForClass(class->super_class) : [NSMutableArray array]);
   
   struct objc_method_list
       *methods;
       
   void
       *iterator = NULL;
       
   while(methods = class_nextMethodList(aClass, &iterator ))
       {
       int i = methods->method_count;
       
       while(i--)
           {
           Method currentMethod = &methods->method_list[i];
           [methodNames addObject:
NSStringFromSelector(currentMethod->method_name)];
           }
       }
   return [NSArray arrayWithArray:methodNames];
  }
   
The method above will show you only the methods implemented in aClass,
not its inherited methods.  To get all of the method names, comment out
the line "*methodNames = [NSMutableArray array];", and uncomment the
line after it.

-jcr

John C. Randolph    <<email_removed>>  (408) 974-8819
Sr. Cocoa Software Engineer,
Apple Worldwide Developer Relations
http://developer.apple.com/cocoa/index.html
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