ios – MFMailComposeViewControllerDelegate不工作Swift 3

我已经在我的一些应用程序中使用了邮件编写器一段时间了,而且最近mailComposeDelegate不再被调用.我不确定这是否与新版本的 Swift有关.所以,我想我会问,看看是否有其他人有类似的问题.我可以介绍邮件作曲家,但由于代表不工作,它永远不会被解雇.

以下是我一直使用的代码的精确副本：

func launchFeedBACk() {
    guard MFMailComposeViewController.canSendMail() else {
        return
    }

    let emailtitle = "FeedBACk"
    let messageBody = ""
    let toRecipents = ["johnappleseed@icloud.com"]
    mailComposer.mailComposeDelegate = self
    mailComposer.setSubject(emailtitlE)
    mailComposer.setmessageBody(messageBody,isHTML: falsE)
    mailComposer.setToRecipients(toRecipents)
    self.show(mailComposer,sender: self)
}

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

@objc(mailComposeController:didFinishWithResult:error:)
    func mailComposeController(_ controller: MFMailComposeViewController,error: NSError?) {
        controller.dismiss(animated: truE)
    }