gistfile1.m

- (void)showActivityController
{
    NSArray *excludedApps = @[
      UIActivityTypeAirDrop,
      UIActivityTypeCopyToPasteboard,
      UIActivityTypeAddToReadingList,
      UIActivityTypePrint,
      UIActivityTypeSaveToCameraRoll
    ];
    
    UIActivityViewController *activityController = [[UIActivityViewController alloc] initWithActivityItems:@[@"I'm using Cloak to avoid running into annoying friends, co-workers, and maybe even you. Try it out on the App Store at: http://usecloak.com"] applicationActivities:nil];
    [activityController setValue:@"Stay away from me. And everybody else." forKey:@"subject"];
    activityController.excludedActivityTypes = excludedApps;
    
    [self presentViewController:activityController animated:YES completion:nil];
}