http://www.atmarkit.co.jp/fcoding/articles/objc/05/objc05a.html

gistfile1.c

  // NSDictionaryをループする
  NSDictionary *dict =
    [NSDictionary dictionaryWithObjectsAndKeys:
      @"futaba", @"name", [NSNumber numberWithInt:4], @"age",
      @"white", @"color", nil];
  for (id key in dict) {
    NSLog(@"key: %@, value: %@\n",
          key,
          [dict objectForKey:key]);
  }