如何以编程方式在iPhone上发送短信？

import MessageUI

class ViewController: UIViewController, MFMessageComposeViewControllerDelegate {

func sendSMS() {
    // 检查设备是否可以发送短信
    if MFMessageComposeViewController.canSendText() {
        let messageComposeVC = MFMessageComposeViewController()
        messageComposeVC.body = "这是短信内容"
        messageComposeVC.recipients = ["电话号码"]
        messageComposeVC.messageComposeDelegate = self
        present(messageComposeVC, animated: true, completion: nil)
    } else {
        print("设备不支持发送短信")
    }
}

func messageComposeViewController(_ controller: MFMessageComposeViewController, didFinishWith result: MessageComposeResult) {
    switch result {
    case .sent:
        print("短信已发送")
    case .failed:
        print("短信发送失败")
    case .cancelled:
        print("短信发送取消")
    @unknown default:
        print("未知结果")
    }
    controller.dismiss(animated: true, completion: nil)
}

sendSMS()