MFMailComposeViewController，Swift 4，Xcode 9

ĐorđeNilović

我对MFMailComposeViewControllerDelegate函数有问题。

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

警告说

实例方法'mailComposeController（：didFinishWith：error :)'与协议'MFMailComposeViewControllerDelegate'的可选要求'mailComposeController（：didFinishWith：error :)'几乎匹配

将'mailComposeController（_：didFinishWith：error :)'设为私有以使此警告静音

单击取消后，我需要将用户返回到App并关闭MFMailComposeViewController，并且不会触发此功能。

是的，我添加了代表 composeVC.mailComposeDelegate = self

如果有人遇到类似问题，我将不胜感激。谢谢

编辑

仅当我将语言设置为Swift 4时，才会发生这种行为。我刚刚退回了几次提交，并且在Swift 3.2中工作得很好。

基本上，这是代码：

class TechSupportVC: UIViewController, MFMailComposeViewControllerDelegate {
    let composeVC = MFMailComposeViewController()

override func viewDidLoad() {
    super.viewDidLoad()

    composeVC.mailComposeDelegate = self
    composeVC.setToRecipients(["[email protected]"])
    composeVC.setSubject("My message")
}

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

@IBAction func sendPressed(_ sender: Any) {
    guard MFMailComposeViewController.canSendMail() else {
        showMailServiceErrorAlert()
        return
    }

    composeVC.setMessageBody("Test credentials: \(firstAndLastNameTextField.text!)\nPhone: \(numberTextField.text!)\n\n\(messageTextView.text!)", isHTML: false)

    self.present(composeVC, animated: true, completion: nil)
}

}

鲍里斯（Boris Y.）

我不可能应用Đorđe的解决方案，这另一个答案对我有所帮助。

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

添加Swift.前缀即可Error?解决该问题。

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