UIActivityController behaviour different on device and simulator

Question

I add an activityViewController to my app like below, passing in an image

UIActivityViewController *avc = [[UIActivityViewController alloc]initWithActivityItems:[NSArray arrayWithObjects:img,nil] applicationActivities:[NSArray arrayWithObjects:nil]];
        [self presentModalViewController:avc animated:YES];
        [avc release];

On the simulator (twitter, facebook and weibo accounts all not configured):

options mail, twitter, facebook, weibo, assign to contact, save to camera roll, print, and copy appear by default.

but on device:

in my app: twitter, facebook and weibo only show if the accounts are configured.

in safari: twitter, facebook and weibo options are available irregardless of whether the accounts are configured.

I am expecting the same behaviour in my app as safari. am I missing a particular step?

Answer 1

Okay I have figured the problem.

The options shown in the UIActivityViewController totally depends on the type of items that are to be shared. For example, if there is a video, it will not show Facebook or twitter option. But if it's an image and title, it definitely will show the relevant options.

The following will show up apps like mail, twitter, Facebook, assignToContact, save to camera roll, print, copy, etc

// Create the content
NSString *message = @"The Upcoming App Scribble Talk";
UIImage *imageToShare = [UIImage imageNamed:@"createbtn.png"];

NSArray *objectsToShare = [NSArray arrayWithObjects:message, image, nil];

However, the following shall bring up only camera roll, mail or copy.

NSString *message = @"The Upcoming App Scribble Talk";
NSString *videoToShare = @"myFirsScribble.mov";
NSURL *videoPath = [NSURL fileURLWithPath:videoToShare];

NSArray *objectsToShare = [NSArray arrayWithObjects:message, videoPath, nil];

Answer 2

I think you want to show some certain service only in your UIActivityViewController. You may one property called excludedActivityTypes to be defined as below to avoid some default activity.

UIActivityViewController *yourvc = [[UIActivityViewController alloc]initWithActivityItems:[NSArray arrayWithObjects:img,nil] applicationActivities:[NSArray arrayWithObjects:nil]];
yourvc.excludedActivityTypes = @[UIActivityTypePostToWeibo,UIActivityTypePrint,UIActivityTypeMail,UIActivityTypeCopyToPasteboard];//Try this code in simulator.. you can only see FB & Twitter.  
        [self presentModalViewController:yourvc animated:YES];
        [avc release];

likewise you can excluded from default UIActivityViewController..