alert_controller_actionsheet.swift

//create object
        let alertController = UIAlertController(title: "Share ♂", message: "Share the your content on social media.", preferredStyle: .actionSheet)
        
        // create action objects
        // which can be useed to handle the different action when user tapped on any one of them
        let facebookAction = UIAlertAction(title: "Facebook", style: .default) { (action) in
            //handle facebook button action
            print("facebook button tapped")
            self.performLogin(alertController: alertController)
        }
        
        let twitterAction = UIAlertAction(title: "Twitter", style: .default) { (action) in
            //handle cancel button
            print("twitter button tapped")
        }
        
        let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) { (action) in
            //handle cancel button
            print("cancel button tapped")
        }

        
        //add two button action to the alert controller
        alertController.addAction(facebookAction)
        alertController.addAction(twitterAction)
        alertController.addAction(cancelAction)

        
        //display
        present(alertController, animated: true, completion: nil)