Objective-C

NSString *textToShare = @"StackOverflow Documentation!! Together, we can do for Documentation what we did for Q&A.";
NSURL *documentationURL = [NSURL URLWithString:@"<http://stackoverflow.com/tour/documentation>"];

NSArray *objectsToShare = @[textToShare, documentationURL];

UIActivityViewController *activityVC = [[UIActivityViewController alloc] initWithActivityItems:objectsToShare applicationActivities:nil];

[self presentViewController:activityVC animated:YES completion:nil];

Swift

let textToShare = "StackOverflow Documentation!! Together, we can do for Documentation what we did for Q&A."
let documentationURL = NSURL(string:"<http://stackoverflow.com/tour/documentation>")

let objToShare : [AnyObject] = [textToShare, documentationURL!]

let activityVC = UIActivityViewController(activityItems: objToShare, applicationActivities: nil)
self.presentViewController(activityVC, animated: true, completion: nil)