Trackable UIActivity

Same as usual UIActivities.

ASTwitterActivity  *twitter  = [[ASTwitterActivity alloc] init];
ASFacebookActivity *facebook = [[ASFacebookActivity alloc] init];
ASMailActivity     *mail     = [[ASMailActivity alloc] init];
ASSMSActivity      *sms      = [[ASSMSActivity alloc] init];

NSArray *activities = @[twitter,
                        facebook,
                        mail,
                        sms];

UIActivityViewController *activityCtr;
activityCtr = [[UIActivityViewController alloc] initWithActivityItems:nil
                                                applicationActivities:activities];

ShareSample will be useful for the reference.