- (void)removeFromLoginItems
{
  NSString *appName = [[[NSBundle mainBundle] bundlePath] lastPathComponent];
  NSString *loginWindowPlistPath = [@"~/Library/Preferences/loginwindow.plist" stringByExpandingTildeInPath]; 
  NSMutableDictionary *loginWindowPrefsDictionary = [NSMutableDictionary dictionaryWithContentsOfFile:loginWindowPlistPath];
  NSMutableArray *launchItems = [NSMutableArray arrayWithArray:[loginWindowPrefsDictionary valueForKey:@"AutoLaunchedApplicationDictionary"]];
  
  NSEnumerator *enumerator = [launchItems objectEnumerator];
  id application;
  while ( application = [enumerator nextObject] ) {
    if ( [[[application valueForKey:@"Path"] lastPathComponent] isEqualToString: appName] ) {
      
      // These 4 lines are run if the app is found in "Login Items".
      // You can replace these lines with something like "return YES;"
      // if you just want a method that checks for your app in the list.
      [launchItems removeObject:application];
      [loginWindowPrefsDictionary setObject:launchItems forKey:@"AutoLaunchedApplicationDictionary"];
      [loginWindowPrefsDictionary writeToFile:loginWindowPlistPath atomically:YES];
      return;
    }
  }
}

- (void)addToLoginItems
{
  NSString *fullPath = [[NSBundle mainBundle] bundlePath];
  NSString *script = [NSString stringWithFormat:@"set appPath to \"%@\" \ntell application \"System Events\" \nmake login item at end with properties {path:appPath, hidden:false} \nend tell", fullPath];
  NSAppleScript *appleScript = [[NSAppleScript alloc] initWithSource:script];
  [appleScript executeAndReturnError:nil];
  
}