Question

我正在开发一个简单的swift应用程序，用户输入一个电子邮件地址并按下一个打开邮件应用程序的按钮，输入的地址在地址栏中。我知道如何在Objective-C中执行此操作，但是我无法在Swift中使用它。

Answer 1

您可以在iOS中使用简单的mailto：链接来打开邮件应用程序。

let email = "foo@bar.com"
if let url = URL(string: "mailto:\(email)") {
  if #available(iOS 10.0, *) {
    UIApplication.shared.open(url)
  } else {
    UIApplication.shared.openURL(url)
  }    
}

Answer 2

我不确定您是想切换到邮件应用程序本身，还是只是打开并发送电子邮件。对于后一个选项链接到按钮IBAction：

    import UIKit
    import MessageUI

    class ViewController: UIViewController, MFMailComposeViewControllerDelegate {

    @IBAction func launchEmail(sender: AnyObject) {

    var emailTitle = "Feedback"
    var messageBody = "Feature request or bug report?"
    var toRecipents = ["friend@stackoverflow.com"]
    var mc: MFMailComposeViewController = MFMailComposeViewController()
    mc.mailComposeDelegate = self
    mc.setSubject(emailTitle)
    mc.setMessageBody(messageBody, isHTML: false)
    mc.setToRecipients(toRecipents)

    self.presentViewController(mc, animated: true, completion: nil)
    }

    func mailComposeController(controller:MFMailComposeViewController, didFinishWithResult result:MFMailComposeResult, error:NSError) {
        switch result {
        case MFMailComposeResultCancelled:
            print("Mail cancelled")
        case MFMailComposeResultSaved:
            print("Mail saved")
        case MFMailComposeResultSent:
            print("Mail sent")
        case MFMailComposeResultFailed:
            print("Mail sent failure: \(error?.localizedDescription)")
        default:
            break
        }
        self.dismissViewControllerAnimated(true, completion: nil)
    }

    }

Answer 3

在Swift 3中，您确保添加import MessageUI并且需要符合MFMailComposeViewControllerDelegate协议。

func sendEmail() {
  if MFMailComposeViewController.canSendMail() {
    let mail = MFMailComposeViewController()
    mail.mailComposeDelegate = self
    mail.setToRecipients(["ved.ios@yopmail.com"])
    mail.setMessageBody("<p>You're so awesome!</p>", isHTML: true)

    present(mail, animated: true)
  } else {
    // show failure alert
  }
}

协议：

func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
  controller.dismiss(animated: true)
}

Answer 4

Swift 2，availability检查：

if(!(evens ==2 || evens==3)) {
        System.out.print("This was called because " + evens + " is not equal to 2 or 3");
} else {
        System.out.print(evens +" equals 2 or 3");
}

Answer 5

Stephen Groom为Swift 3更新了答案

let email = "email@email.com"
let url = URL(string: "mailto:\(email)")
UIApplication.shared.openURL(url!)

Answer 6

这是它如何寻找Swift 4：

import MessageUI

if MFMailComposeViewController.canSendMail() {
    let mail = MFMailComposeViewController()
    mail.mailComposeDelegate = self
    mail.setToRecipients(["test@test.test"])
    mail.setSubject("Bla")
    mail.setMessageBody("<b>Blabla</b>", isHTML: true)
    present(mail, animated: true, completion: nil)
} else {
    print("Cannot send mail")
    // give feedback to the user
}

func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
        switch result.rawValue {
        case MFMailComposeResult.cancelled.rawValue:
            print("Cancelled")
        case MFMailComposeResult.saved.rawValue:
            print("Saved")
        case MFMailComposeResult.sent.rawValue:
            print("Sent")
        case MFMailComposeResult.failed.rawValue:
            print("Error: \(String(describing: error?.localizedDescription))")
        default:
            break
        }
        controller.dismiss(animated: true, completion: nil)
    }

Answer 7

这是Swift中3个步骤的直接解决方案。

import MessageUI

添加以符合代表

MFMailComposeViewControllerDelegate

然后创建你的方法：

    func sendEmail() {
    if MFMailComposeViewController.canSendMail() {
        let mail = MFMailComposeViewController()
        mail.mailComposeDelegate = self
        mail.setToRecipients(["support@mail.com"])
        mail.setSubject("Support App")
        mail.setMessageBody("<p>Send us your issue!</p>", isHTML: true)
        presentViewController(mail, animated: true, completion: nil)
    } else {
        // show failure alert
    }
}

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

Answer 8

如果您只是想通过URL打开邮件客户端，那么这是Swift 4的更新：

let email = "foo@bar.com"
if let url = URL(string: "mailto:\(email)") {
   UIApplication.shared.open(url, options: [:], completionHandler: nil)
}

这对我来说非常好：）

Answer 9

在Swift 4.2和iOS 9+中

let appURL = URL(string: "mailto:BLAH@BLAH.COM")!

if #available(iOS 10.0, *) {
    UIApplication.shared.open(appURL as URL, options: [:], completionHandler: nil)
}
else {
    UIApplication.shared.openURL(appURL as URL)
}

用您的电子邮件替换BLAH@BLAH.COM。

Answer 10

@IBAction func launchEmail(sender: AnyObject) {
 if if MFMailComposeViewController.canSendMail() {
   var emailTitle = "Feedback"
   var messageBody = "Feature request or bug report?"
   var toRecipents = ["friend@stackoverflow.com"]
   var mc: MFMailComposeViewController = MFMailComposeViewController()
   mc.mailComposeDelegate = self
   mc.setSubject(emailTitle)
   mc.setMessageBody(messageBody, isHTML: false)
   mc.setToRecipients(toRecipents)

   self.present(mc, animated: true, completion: nil)
 } else {
   // show failure alert
 }
}

func mailComposeController(controller:MFMailComposeViewController, didFinishWithResult result:MFMailComposeResult, error:NSError) {
    switch result {
    case .cancelled:
        print("Mail cancelled")
    case .saved:
        print("Mail saved")
    case .sent:
        print("Mail sent")
    case .failed:
        print("Mail sent failure: \(error?.localizedDescription)")
    default:
        break
    }
    self.dismiss(animated: true, completion: nil)
}

请注意，并非所有用户都将其设备配置为发送电子邮件，这就是为什么我们需要在尝试发送之前检查canSendMail（）的结果。另请注意，您需要捕获didFinishWith回调才能关闭邮件窗口。

Answer 11

您应该尝试使用内置邮件编辑器进行发送，如果失败，请尝试使用共享：

func contactUs() {

    let email = "info@example.com" // insert your email here
    let subject = "your subject goes here"
    let bodyText = "your body text goes here"

    // https://developer.apple.com/documentation/messageui/mfmailcomposeviewcontroller
    if MFMailComposeViewController.canSendMail() {

        let mailComposerVC = MFMailComposeViewController()
        mailComposerVC.mailComposeDelegate = self as? MFMailComposeViewControllerDelegate

        mailComposerVC.setToRecipients([email])
        mailComposerVC.setSubject(subject)
        mailComposerVC.setMessageBody(bodyText, isHTML: false)

        self.present(mailComposerVC, animated: true, completion: nil)

    } else {
        print("Device not configured to send emails, trying with share ...")

        let coded = "mailto:\(email)?subject=\(subject)&body=\(bodyText)".addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)
        if let emailURL = URL(string: coded!) {
            if #available(iOS 10.0, *) {
                if UIApplication.shared.canOpenURL(emailURL) {
                    UIApplication.shared.open(emailURL, options: [:], completionHandler: { (result) in
                        if !result {
                            print("Unable to send email.")
                        }
                    })
                }
            }
            else {
                UIApplication.shared.openURL(emailURL as URL)
            }
        }
    }
}

Answer 12

虽然其他答案都是正确的，但您永远无法知道运行应用程序的iPhone / iPad是否安装了Apple的邮件应用程序，因为用户可以删除它。

>

最好支持多个电子邮件客户端。以下代码以更优雅的方式处理电子邮件发送。代码流为：

如果已安装Mail应用程序，请打开预填充了提供数据的Mail编写器
否则，请尝试依次打开Gmail应用，Outlook，Yahoo邮件和Spark。
如果未安装任何客户端，则回退到默认的mailto:..，提示用户安装Apple的Mail应用。

代码以 Swift 4 编写：

    import MessageUI
    import UIKit

    class SendEmailViewController: UIViewController, MFMailComposeViewControllerDelegate {

        @IBAction func sendEmail(_ sender: UIButton) {
            // Modify following variables with your text / recipient
            let recipientEmail = "test@email.com"
            let subject = "Multi client email support"
            let body = "This code supports sending email via multiple different email apps on iOS! :)"

            // Show default mail composer
            if MFMailComposeViewController.canSendMail() {
                let mail = MFMailComposeViewController()
                mail.mailComposeDelegate = self
                mail.setToRecipients([recipientEmail])
                mail.setSubject(subject)
                mail.setMessageBody(body, isHTML: false)

                present(mail, animated: true)

            // Show third party email composer if default Mail app is not present
            } else if let emailUrl = createEmailUrl(to: recipientEmail, subject: subject, body: body) {
                UIApplication.shared.open(emailUrl)
            }
        }

        private func createEmailUrl(to: String, subject: String, body: String) -> URL? {
            let subjectEncoded = subject.addingPercentEncoding(withAllowedCharacters: .urlHostAllowed)!
            let bodyEncoded = body.addingPercentEncoding(withAllowedCharacters: .urlHostAllowed)!

            let gmailUrl = URL(string: "googlegmail://co?to=\(to)&subject=\(subjectEncoded)&body=\(bodyEncoded)")
            let outlookUrl = URL(string: "ms-outlook://compose?to=\(to)&subject=\(subjectEncoded)")
            let yahooMail = URL(string: "ymail://mail/compose?to=\(to)&subject=\(subjectEncoded)&body=\(bodyEncoded)")
            let sparkUrl = URL(string: "readdle-spark://compose?recipient=\(to)&subject=\(subjectEncoded)&body=\(bodyEncoded)")
            let defaultUrl = URL(string: "mailto:\(to)?subject=\(subjectEncoded)&body=\(bodyEncoded)")

            if let gmailUrl = gmailUrl, UIApplication.shared.canOpenURL(gmailUrl) {
                return gmailUrl
            } else if let outlookUrl = outlookUrl, UIApplication.shared.canOpenURL(outlookUrl) {
                return outlookUrl
            } else if let yahooMail = yahooMail, UIApplication.shared.canOpenURL(yahooMail) {
                return yahooMail
            } else if let sparkUrl = sparkUrl, UIApplication.shared.canOpenURL(sparkUrl) {
                return sparkUrl
            }

            return defaultUrl
        }

        func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
            controller.dismiss(animated: true)
        }
    }

请注意，我故意错过了Outlook应用的正文，因为它无法解析它。

您还必须将以下代码添加到Info.plist文件中，该文件将使用的URl查询方案列入白名单。

<key>LSApplicationQueriesSchemes</key>
<array>
    <string>googlegmail</string>
    <string>ms-outlook</string>
    <string>readdle-spark</string>
    <string>ymail</string>
</array>

Answer 13

对于Swift 4.2及更高版本

let supportEmail = "abc@xyz.com"
if let emailURL = URL(string: "mailto:\(supportEmail)"), UIApplication.shared.canOpenURL(emailURL)
{
    UIApplication.shared.open(emailURL, options: [:], completionHandler: nil)
}

允许用户选择许多邮件选项（例如iCloud，google，yahoo，Outlook.com-如果手机中未预先配置邮件）来发送电子邮件。

Answer 14

在视图控制器中，您希望从其上打开邮件应用的位置。

在文件顶部，导入MessageUI 。

将此功能放在控制器中。

func showMailComposer(){

  guard MFMailComposeViewController.canSendMail() else {
       return
  }
  let composer = MFMailComposeViewController()
  composer.mailComposeDelegate = self
  composer.setToRecipients(["abc@gmail.com"]) // email id of the recipient
  composer.setSubject("testing!!!")
  composer.setMessageBody("this is a test mail.", isHTML: false)
  present(composer, animated: true, completion: nil)
 }

扩展您的View Controller并遵守 MFMailComposeViewControllerDelegate 。

使用此方法并处理失败，发送邮件。

func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
  if let _ = error {
      controller.dismiss(animated: true, completion: nil)
      return
  }
  controller.dismiss(animated: true, completion: nil)
}

Answer 15

对于我们这些仍然落后于Swift 2.3的人来说，这是Gordon在语法中的答案：

let email = "foo@bar.com"
if let url = NSURL(string: "mailto:\(email)") {
   UIApplication.sharedApplication().openURL(url)
}

如何从Swift打开邮件应用程序

15 个答案: