IOS SWIFT 메일 보내기 swift send mail (MFMailComposeViewController)

import Foundation
import UIKit
import MessageUI
 
class MyPageViewController: UIViewController , MFMailComposeViewControllerDelegate{
    
    @IBAction func sendMail(sender: AnyObject) { //메일 보내기 버튼 선택시
        let mailComposeViewController = configuredMailComposeViewController()
        if MFMailComposeViewController.canSendMail() {
            self.presentViewController(mailComposeViewController, animated: true, completion: nil)
            print("can send mail")
        } else {
            self.showSendMailErrorAlert()
        }
    }
    
    func configuredMailComposeViewController() -> MFMailComposeViewController {
        let mailComposerVC = MFMailComposeViewController()
        mailComposerVC.mailComposeDelegate = self
        mailComposerVC.setToRecipients(["tom@gmail.com"])
        mailComposerVC.setSubject("봉사꾼 IOS 문의 메일")
        mailComposerVC.setMessageBody("여러분의 소중한 의견 감사드립니다. \n - 봉사꾼 -", isHTML: false)
        
        return mailComposerVC
    }
    
    func showSendMailErrorAlert() {
        let sendMailErrorAlert = UIAlertView(title: "메일을 전송 실패", message: "아이폰 이메일 설정을 확인하고 다시 시도해주세요.", delegate: self, cancelButtonTitle: "확인")
        sendMailErrorAlert.show()
    }
    
    // MARK: MFMailComposeViewControllerDelegate Method
    func mailComposeController(controller: MFMailComposeViewController, didFinishWithResult result: MFMailComposeResult, error: NSError?) {
        controller.dismissViewControllerAnimated(true, completion: nil)
    }
}