Swift 3：通过iOS共享表发送电子邮件时如何命名PDF？

上下文： 我有一个应用程序，可以查看设备规格表。现在，每个表视图都有一个“视图”和“共享”按钮，供用户与规范表的PDF版本交互。“查看”按钮在web视图中打开PDF，而“电子邮件”按钮将PDF添加为附件-这两种方法都很有效。我想不需要两个按钮，只需要一张共享表。共享表可以工作，但我不再以编程方式设置pdf的名称

问题：如何以与MailComposeViewController类似的方式，通过UIActivityViewController为邮件中附加的文件设置文件名？此外，是否可以在UIActivityViewController中以编程方式抄送组电子邮件

更新：该文件位于我们公司的网站上。应用程序的唯一属性是文件的URL位置。一切正常，我只想控制共享表打开的邮件生成器的输入

MailComposeViewController（按预期工作）

UIActivityViewController（工作，但不命名文件）

---

我使用的解决方法是将UIAlertController与我希望用户拥有的选项一起使用。这使我可以选择运行发送电子邮件的功能

    @IBAction func shareSpecButton(_ sender: UIBarButtonItem) {
     if let contentURL = URL(string: targetURL) {
        sendMailViaActionSheet(fileURL: contentURL)
     }
    }

 private func sendMail (fileURL: URL) {

    let composeVC = MFMailComposeViewController()
    composeVC.mailComposeDelegate = self

    // Configure the fields of the interface.
    //composeVC.setToRecipients(["user@domain.com"])
    composeVC.setCcRecipients(["group@domain.com"])
    composeVC.setSubject("Spec Sheet Request")
    composeVC.setMessageBody("The requested spec sheet is attached.", isHTML: false)

    if let fileData = NSData(contentsOf: fileURL as URL) {
        print("File data loaded.")
        composeVC.addAttachmentData( fileData as Data, mimeType: "application/pdf", fileName: "Tubular Spec Sheet")
    }
    //}

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


}

警报控制器设置：

private func sendMailViaActionSheet (fileURL: URL) {

    // Set up Alert Controller
    var alert = UIAlertController(
        title: "Share Spec Sheet",
        message: "Choose a method to share the spec sheet ",
        preferredStyle: .actionSheet
    )

    // First Action
    alert.addAction(UIAlertAction(
        title: "Send pdf in an email",
        style: UIAlertActionStyle.default)
    { (action: UIAlertAction) -> Void in
        // code to execute when action is chosen

        // Send pdf as data file
        self.sendMail(fileURL: fileURL)
        }
    )

    // Second Action
    alert.addAction(UIAlertAction(
        title: "Send link in an email",
        style: UIAlertActionStyle.default)
    { (action: UIAlertAction) -> Void in
        // code to execute when action is chosen
        }
    )

    // Cancel Action
    alert.addAction(UIAlertAction(
        title: "Cancel",
        style: .cancel)
    { (action: UIAlertAction) -> Void in
        // do nothing
        }
    )

    // Present the action sheet
    present( alert, animated: true, completion: nil)
}

---

尝试将

sharedContent

设置为

[contentURL]

而不是

[content]

。换句话说，共享URL而不是数据。我一开始是这样做的，它在邮寄时不会附加PDF。当前方法附加PDF，但我无法控制附件的名称。或电子邮件主题。或收件人。如果它是本地文件URL，则应作为URL。不相关，但为什么在Swift中使用

NSData

？只需使用

数据

。很抱歉造成混淆，但该文件不是本地文件。它在我们公司的网站上。

    @IBAction func shareSpecButton(_ sender: UIBarButtonItem) {
     if let contentURL = URL(string: targetURL) {
        sendMailViaActionSheet(fileURL: contentURL)
     }
    }

 private func sendMail (fileURL: URL) {

    let composeVC = MFMailComposeViewController()
    composeVC.mailComposeDelegate = self

    // Configure the fields of the interface.
    //composeVC.setToRecipients(["user@domain.com"])
    composeVC.setCcRecipients(["group@domain.com"])
    composeVC.setSubject("Spec Sheet Request")
    composeVC.setMessageBody("The requested spec sheet is attached.", isHTML: false)

    if let fileData = NSData(contentsOf: fileURL as URL) {
        print("File data loaded.")
        composeVC.addAttachmentData( fileData as Data, mimeType: "application/pdf", fileName: "Tubular Spec Sheet")
    }
    //}

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


}

private func sendMailViaActionSheet (fileURL: URL) {

    // Set up Alert Controller
    var alert = UIAlertController(
        title: "Share Spec Sheet",
        message: "Choose a method to share the spec sheet ",
        preferredStyle: .actionSheet
    )

    // First Action
    alert.addAction(UIAlertAction(
        title: "Send pdf in an email",
        style: UIAlertActionStyle.default)
    { (action: UIAlertAction) -> Void in
        // code to execute when action is chosen

        // Send pdf as data file
        self.sendMail(fileURL: fileURL)
        }
    )

    // Second Action
    alert.addAction(UIAlertAction(
        title: "Send link in an email",
        style: UIAlertActionStyle.default)
    { (action: UIAlertAction) -> Void in
        // code to execute when action is chosen
        }
    )

    // Cancel Action
    alert.addAction(UIAlertAction(
        title: "Cancel",
        style: .cancel)
    { (action: UIAlertAction) -> Void in
        // do nothing
        }
    )

    // Present the action sheet
    present( alert, animated: true, completion: nil)
}