UIActivityViewController presentation on an iPad

gistfile1.m

-(IBAction)Actions:(UIBarButtonItem*)sender 
{
    if ([activityPopover isPopoverVisible] == YES) 
    {
        [activityPopover dismissPopoverAnimated:YES];
        return;
    }
   
    UIActivityViewController *sharing = [[UIActivityViewController alloc] initWithActivityItems:[NSArray arrayWithObject:currentURL] applicationActivities:@[bookmarkActivity]];

    activityPopover = [[UIPopoverController alloc] initWithContentViewController:sharing];
    [activityPopover presentPopoverFromBarButtonItem:sender permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];    
}

//you have to create a UIPopoverController (activityPopover) first