Swift 3，iOS10.3-电子邮件窗口打开，但不'；关不上

我可以通过按下按钮在iOS 10.3中打开电子邮件窗口，但无法关闭它（取消和发送不关闭它）。由于我是Swift新手，我假设在我的代码中有一个明显的错误：）

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您正在混合使用Swift 2和Swift 3方法。例如，

func-mailComposeController（控制器：MFMailComposeViewController！，最终结果：mfmailcomposesult，错误：NSError！）

需要替换为

func-mailComposeController（\uController:MFMailComposeViewController，最终结果：mfmailcomposesult，错误：error？）

请参见Swift类型

NSError

vs

Error

，以及“u”和不太详细的参数说明：`didFinishWithResult:`vs

didFinishWithResult:

。因此不会调用您的方法，因为它不是预期的方法。的可能重复

import UIKit
import MessageUI
import Foundation

class settings: UIViewController, MFMailComposeViewControllerDelegate {

    override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

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

@IBAction func sendEmailButtonTapped(_ sender: Any) {
    let mailComposeViewController = configuredMailComposeViewController()
    if MFMailComposeViewController.canSendMail() {
        self.present(mailComposeViewController, animated: true, completion: nil)
    } else {
        self.showSendMailErrorAlert()
    }
}
func configuredMailComposeViewController() -> MFMailComposeViewController {
    let mailComposerVC = MFMailComposeViewController()
    mailComposerVC.mailComposeDelegate = self
    mailComposerVC.setToRecipients(["email@email.com"])
    mailComposerVC.setSubject("Subject of email")
    return mailComposerVC
}
func showSendMailErrorAlert() {
    let sendMailErrorAlert = UIAlertView(title: "Could Not Send Email", message: "Your device could not send Email.  Please check Email configuration and try again.", delegate: self, cancelButtonTitle: "OK")
    sendMailErrorAlert.show()
}

func mailComposeController(controller: MFMailComposeViewController!, didFinishWithResult result: MFMailComposeResult, error: NSError!) {
    controller.dismiss(animated: true, completion: nil)
}