In order to have more control over what is being shared, you’re providing a customsetter method for objectsToShare. The method will check the count of objects andhide or display the action button depending on whether there are any entries in thearray.

Next up is the workhorse method to invoke the share sheet dialog.Still working in BaseViewController.m, add the following method:

// Configure and present an instance of UIActivityViewControllerfor AirDrop only.
- (void)presentActivityViewControllerWithObjects:(NSArray*)objects

{

// 1 - Create an instance of UIActivityViewController with theobject.

UIActivityViewController *controller =[[UIActivityViewController alloc] initWithActivityItems:objectsapplicationActivities:nil];

// 2 - Exclude all activities except AirDrop.

NSArray *excludedActivities = @[UIActivityTypePostToTwitter,UIActivityTypePostToFacebook, UIActivityTypePostToWeibo,UIActivityTypeMessage, UIActivityTypeMail, UIActivityTypePrint,UIActivityTypeCopyToPasteboard, UIActivityTypeAssignToContact,UIActivityTypeSaveToCameraRoll, UIActivityTypeAddToReadingList,UIActivityTypePostToFlickr, UIActivityTypePostToVimeo,UIActivityTypePostToTencentWeibo];

controller.excludedActivityTypes = excludedActivities;

// 3 - Present it.

[self presentViewController:controller animated:YEScompletion:nil];

}

1. Creates an instance of UIActivityViewController, passing in the array ofobjects.

2. Excludes all other possible options that UIActivityViewController can present— such as sharing via Twitter —since you want to limit the user to just AirDrop.

3. Displays UIActivityViewController as modal.
Finally, link the above method with the action button in the navigation bar by

adding this method:

- (IBAction)actionButtonTapped:(id)sender{

[selfpresentActivityViewControllerWithObjects:self.objectsToShare];}

When the action button is tapped, this method ties things together by callingpresentActivityViewControllerWithObjects:with the current list of objects toshare.