从swift 3发送电子邮件

Question

我正在尝试使用发送电子邮件选项设置应用.

我有这个代码:

import Foundation
import MessageUI
import UIKit

class emailClass: UIViewController, MFMailComposeViewControllerDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()

        if !MFMailComposeViewController.canSendMail() {
            print("Mail services are not available")
            return
        }        
        sendEmail() 
    }

    func sendEmail() {      
        let composeVC = MFMailComposeViewController()
        composeVC.mailComposeDelegate = self
        // Configure the fields of the interface.
        composeVC.setToRecipients(["address@example.com"])
        composeVC.setSubject("Hello!")
        composeVC.setMessageBody("Hello this is my message body!", isHTML: false)
        // Present the view controller modally.
        self.present(composeVC, animated: true, completion: nil)
    }

    func mailComposeController(controller: MFMailComposeViewController,
                           didFinishWithResult result: MFMailComposeResult, error: NSError?) {
        // Check the result or perform other tasks.
        // Dismiss the mail compose view controller.
        controller.dismiss(animated: true, completion: nil)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

所以我收到此消息:"邮件服务不可用".现在我已经在iCloud中登录了模拟器设备...所以我认为应该这样做但不是.为什么这不起作用？你能告诉我什么是错的,我怎么能继续前进？

Answer 1

它不适用于模拟器.请在iPhone设备上测试.您可以参考Apple Developer Portal - MFMailComposeViewController

Answer 2

这就是我做到的.看起来你很好地遵循了文档,我想我会添加我的变体,以防它帮助其他人.另外,这是对当前(2017年8月)语法的更新.

符合MFMailComposeViewControllerDelegate协议,并检查设备是否可以发送邮件.

import Foundation
import UIKit
import MessageUI

class WelcomeViewController: UIViewController, MFMailComposeViewControllerDelegate {


override func viewDidLoad() {
    super.viewDidLoad()

    if !MFMailComposeViewController.canSendMail() {
        print("Mail services are not available")
        return
    }
}

我的应用程序使用IBAction启动邮件组合.

@IBAction func sendFeedbackButtonTapped(_ sender: Any) {

    let composeVC = MFMailComposeViewController()
    composeVC.mailComposeDelegate = self

    // Configure the fields of the interface.
    composeVC.setToRecipients(["exampleEmail@email.com"])
    composeVC.setSubject("Message Subject")
    composeVC.setMessageBody("Message content.", isHTML: false)

    // Present the view controller modally.
    self.present(composeVC, animated: true, completion: nil)

}

关于以下mailComposeController函数,文档说

邮件撰写视图控制器不会自动解除.当用户点击按钮发送电子邮件或取消界面时,邮件撰写视图控制器调用其委托的mailComposeController(_:didFinishWith:error :)方法.您对该方法的实现必须显式地关闭视图控制器,如清单3所示.您还可以使用此方法检查操作的结果.

func mailComposeController(_ controller: MFMailComposeViewController,
                           didFinishWith result: MFMailComposeResult, error: Error?) {
    // Check the result or perform other tasks.

    // Dismiss the mail compose view controller.
    controller.dismiss(animated: true, completion: nil)
   }
}

源Apple文档:MFMailComposeViewController

Answer 3

在Swift 5 中发送电子邮件很容易，您需要确认并实现 MFMailComposeViewControllerDelegate 并检查我们是否可以在此设备上发送电子邮件

这是我用于我的任务的一小段代码

import UIKit
import MessageUI

class ViewController: UIViewController, MFMailComposeViewControllerDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    //MARK: IBAction Method for Button click
    @IBAction func sendEmail(_ sender: Any) {
        //TODO:  You should chack if we can send email or not
        if MFMailComposeViewController.canSendMail() {
            let mail = MFMailComposeViewController()
            mail.mailComposeDelegate = self
            mail.setToRecipients(["you@yoursite.com"])
            mail.setSubject("Email Subject Here")
            mail.setMessageBody("<p>You're so awesome!</p>", isHTML: true)
            present(mail, animated: true)
        } else {
            print("Application is not able to send an email")
        }
    }

    //MARK: MFMail Compose ViewController Delegate method
    func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
        controller.dismiss(animated: true)
    }
}

PS：请不要忘记您需要在真实设备上进行测试

Answer 4

如果应用程序在真实设备中运行,代码似乎很好并且工作正常

MFMailComposeViewController.canSendMail() // returns false for simulators.

你不能在模拟器上测试它,你将能够测试基本的东西,如UI,如何在取消/发送按钮点击发生的事情.

要进行测试,您必须使用设备,设备中的Mail应用程序应配置一些邮件(例如:abc@xyz.com).

希望有所帮助.