iPhone编程:发送短信？访问联系人列表？

import MessageUI

class ViewController: UIViewController, MFMessageComposeViewControllerDelegate {

    func sendSMS() {
        if MFMessageComposeViewController.canSendText() {
            let messageComposeVC = MFMessageComposeViewController()
            messageComposeVC.body = "Hello, this is a test message."
            messageComposeVC.recipients = ["1234567890"]
            messageComposeVC.messageComposeDelegate = self
            present(messageComposeVC, animated: true, completion: nil)
        }
    }

    func messageComposeViewController(_ controller: MFMessageComposeViewController, didFinishWith result: MessageComposeResult) {
        switch result {
        case .sent:
            print("Message sent")
        case .failed:
            print("Message failed")
        case .cancelled:
            print("Message cancelled")
        @unknown default:
            print("Unknown message result")
        }
        controller.dismiss(animated: true, completion: nil)
    }
}

import Contacts

class ViewController: UIViewController, CNContactPickerDelegate {

    func showContacts() {
        let contactPicker = CNContactPickerViewController()
        contactPicker.delegate = self
        present(contactPicker, animated: true, completion: nil)
    }

    func contactPicker(_ picker: CNContactPickerViewController, didSelect contact: CNContact) {
        print("Selected contact: \(contact)")
    }

    func contactPickerDidCancel(_ picker: CNContactPickerViewController) {
        print("Contact picker cancelled")
    }
}