This shows how to implement a share via social media and text or any other app that allows sharing on iOS

swift-implement-share.swift

@IBAction func shareButtonTapped(_ sender: Any) {
        debugPrint("share button has been tapped")
        
        // text to share
        let text = self.currSelectedStore + " have a special! Take a look."
        
//        let urlToShare : storeSpecialsImageUrl
        // If you want to put an image
        let image : UIImage = self.specialsImageView.image!
        
        // set up activity view controller
        let activityViewController = UIActivityViewController(activityItems: [text, storeSpecialsImageUrl, image], applicationActivities: nil)
        activityViewController.popoverPresentationController?.sourceView = self.view // so that iPads won't crash
        
        // exclude some activity types from the list (optional)
        activityViewController.excludedActivityTypes = [ UIActivityType.airDrop ]
        
        // present the view controller
        self.present(activityViewController, animated: true, completion: nil)
    }