Sending Text Message through SMS in Swift

import Foundation
import MessageUI
 
let textMessageRecipients = [] // for pre-populating the recipients list
 
class MessageComposer: NSObject, MFMessageComposeViewControllerDelegate {
    
    // A wrapper function to indicate whether or not a text message can be sent from the user's device
    func canSendText() -> Bool {
        return MFMessageComposeViewController.canSendText()
    }
    
    // Configures and returns a MFMessageComposeViewController instance
    func configuredMessageComposeViewController() -> MFMessageComposeViewController {
        let messageComposeVC = MFMessageComposeViewController()
        messageComposeVC.messageComposeDelegate = self  //  Make sure to set this property to self, so that the controller can be dismissed!
        messageComposeVC.recipients = textMessageRecipients
        messageComposeVC.body =  “Sending Text Message through SMS in Swift"
        return messageComposeVC
    }
    
    // MFMessageComposeViewControllerDelegate callback - dismisses the view controller when the user is finished with it
    func messageComposeViewController(controller: MFMessageComposeViewController!, didFinishWithResult result: MessageComposeResult) {
        controller.dismissViewControllerAnimated(true, completion: nil)
    }
}
 

import UIKit
 
class ViewController: UIViewController {
    // Create a MessageComposer
    let messageComposer = MessageComposer()
    
    @IBAction func sendTextMessageButtonTapped(sender: UIButton) {
        // Make sure the device can send text messages
        if (messageComposer.canSendText()) {
            // Obtain a configured MFMessageComposeViewController
            let messageComposeVC = messageComposer.configuredMessageComposeViewController()
            
            // Present the configured MFMessageComposeViewController instance
            presentViewController(messageComposeVC, animated: true, completion: nil)
        } else {
            // Let the user know if his/her device isn't able to send text messages
            let errorAlert = UIAlertView(title: "Cannot Send Text Message", message: "Your device is not able to send text messages.", delegate: self, cancelButtonTitle: "OK")
            errorAlert.show()
        }
    }
}