如何从我的 iOS 应用程序发送邮件 - SWIFT

Question

我想从我的应用程序中发送邮件。我正在使用 SWIFT 迈出第一步，但我一直停留在某个点上。我想按一个按钮打开邮件。你能告诉我如何进行按钮连接吗？我认为这应该是一个动作，但我不知道将它放在代码的哪个位置

import UIKit
import MessageUI

class ViewController: UIViewController, MFMailComposeViewControllerDelegate {

    func sendEmail() {
        let mailVC = MFMailComposeViewController()
        mailVC.mailComposeDelegate = self
        mailVC.setToRecipients([])
        mailVC.setSubject("Subject for email")
        mailVC.setMessageBody("Email message string", isHTML: false)

        presentViewController(mailVC, animated: true, completion: nil)
    }

    // MARK: - Email Delegate 

    func mailComposeController(controller: MFMailComposeViewController, didFinishWithResult result: MFMailComposeResult, error: NSError?) {
        controller.dismissViewControllerAnimated(true, completion: nil)
    }

    override func viewDidLoad() {
        super.viewDidLoad()

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()

    }
}

Answer 1

先导入库：

import MessageUI

设置委托如下：

MFMailComposeViewControllerDelegate

编写漂亮的代码：

 @IBAction func buttonHandlerSendEmail(_ sender: Any) {

  let mailComposeViewController = configureMailComposer()
    if MFMailComposeViewController.canSendMail(){
        self.present(mailComposeViewController, animated: true, completion: nil)
    }else{
        print("Can't send email")
    }
}
func configureMailComposer() -> MFMailComposeViewController{
    let mailComposeVC = MFMailComposeViewController()
    mailComposeVC.mailComposeDelegate = self
    mailComposeVC.setToRecipients([self.textFieldTo.text!])
    mailComposeVC.setSubject(self.textFieldSubject.text!)
    mailComposeVC.setMessageBody(self.textViewBody.text!, isHTML: false)
    return mailComposeVC
}

还可以编写委托方法，如：

//MARK: - MFMail compose method
func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
    controller.dismiss(animated: true, completion: nil)
}

100% 工作和测试

Answer 2

像这样更改sendEmail：

@IBAction func sendEmail(sender: AnyObject) {
    let mailVC = MFMailComposeViewController()
    mailVC.mailComposeDelegate = self
    mailVC.setToRecipients([])
    mailVC.setSubject("Subject for email")
    mailVC.setMessageBody("Email message string", isHTML: false)

    presentViewController(mailVC, animated: true, completion: nil)
}

并在界面生成器中将您的按钮连接到此操作

Answer 3

斯威夫特 3

let composer = MFMailComposeViewController()

if MFMailComposeViewController.canSendMail() {
     composer.mailComposeDelegate = self
     composer.setToRecipients(["Email1", "Email2"])
     composer.setSubject("Test Mail")
     composer.setMessageBody("Text Body", isHTML: false)
     present(composer, animated: true, completion: nil)
}

委托方法

class SendMailViewController: MFMailComposeViewControllerDelegate {
   func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
        dismiss(animated: true, completion: nil)
    }
}

Answer 4

发送邮件，一般使用MFMailComposer。可以在设备上测试，因为它不能在 iOS 模拟器上运行。

为了测试邮件服务是否可用，使用下面的函数，

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

要发送邮件，请在您的功能或按钮操作中使用以下代码。

let composeVC = MFMailComposeViewController()
composeVC.mailComposeDelegate = self

// Configure the fields of the interface.
composeVC.setToRecipients(["email_address@example.com"])
composeVC.setSubject("Hello World!")
composeVC.setMessageBody("Hello from iOS!", isHTML: false)

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

发送邮件完成后有委托方法，可以定义如下，

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

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

Answer 5

向 Anton Platonov 添加：在请求源文件时导入 MessageUI，并在为视图控制器声明类时添加协议：class FirstVC: UIViewController, MFMailComposeViewControllerDelegate{