Social Sharing iOS Swift 2.3

SocialService.swift

//
//  SocialService.swift
//  SocialSharing
//
//  Created by Zonup Mac 3 on 10/11/16.
//  Copyright © 2016 Zonup. All rights reserved.
//

import UIKit;
import Social;

class SocialService{
    
    static let shared = SocialService();
    
    private init(){
        
    }
    
    
    
    func shareWithFacebook(sender: UIViewController, text: String, url: NSURL?, image: UIImage?, completion: (result: SLComposeViewControllerResult) -> Void){
        makeSocialCall(sender, serviceType: SLServiceTypeFacebook, text: text, url: url, image: image, completion: completion);
    }
    
    func shareWithTwitter(sender: UIViewController, text: String, url: NSURL?, image: UIImage?, completion: (result: SLComposeViewControllerResult) -> Void){
        makeSocialCall(sender, serviceType: SLServiceTypeTwitter, text: text, url: url, image: image, completion: completion);
    }
    
    func makeSocialCall(sender: UIViewController, serviceType: String, text: String, url: NSURL?, image: UIImage?, completion: (result: SLComposeViewControllerResult) -> Void){
        if SLComposeViewController.isAvailableForServiceType(SLServiceTypeTwitter){
            let controller = SLComposeViewController(forServiceType: serviceType);
            controller.setInitialText(text);
            if image != nil{
                controller.addImage(image!);
            }
            if url != nil{
                controller.addURL(url!)
            }
            
            controller.completionHandler = completion;
            sender.presentViewController(controller, animated: true, completion: nil);
        }
        else{
            completion(result: .Cancelled);
        }
    }
}

ViewController.swift

@IBAction func twitterTapped(sender: UIButton) {
    SocialService.shared.shareWithTwitter(self, text: textView.text, url: nil, image: imageVIew.image, completion: shareCompleted);
}

func shareCompleted(result: SLComposeViewControllerResult){
    self.view.userInteractionEnabled = true;
    if result == .Cancelled{
        //"Cancelled";
    }
    else
    {
        //"Completed";
    }
}

For swift 3
https://gist.github.com/ranjankumarzonup/9f8797ad67af704789168c9b8ac5fc1e