Question

只是尝试允许用户发送电子邮件。在单击“联系人”按钮时，它会将我带到黑屏，而不是显示mailComposers。

调试器以

响应

2018-05-14 11：10：59.465952-0400 App [2333：757177]无法在（UIButton）上设置（keyPath）用户定义的检查属性：[setValue：forUndefinedKey：]：此类不是键值编码 - 适用于密钥keyPath。

但是，只有使用SWReveal功能从左向右滑动菜单时才会出现这种情况。从下面删除代码时，所有其他功能都能正常工作。只有在使用下面的代码时，才会按下“按钮接触”时的黑色屏幕。

import Foundation
import UIKit
import MessageUI

class SendEmailVC: MFMailComposeViewController, MFMailComposeViewControllerDelegate
{
@IBAction func Send_Tapped(_ sender: Any)
{

    if MFMailComposeViewController.canSendMail()
    {
        contact()
        let mailComposeViewController = configureMailController() //FIXED √
        self.present(mailComposeViewController, animated: true, completion: nil)
    }
    else
    {
        showMailError()
    }
}

func configureMailController() -> MFMailComposeViewController
{
    let mailComposerVC = MFMailComposeViewController()
    mailComposerVC.mailComposeDelegate = self

    mailComposerVC.setToRecipients(["testing@gmail.com"])
    mailComposerVC.setSubject("Hello")
    mailComposerVC.setMessageBody("How are you doing?", isHTML: false)

    return mailComposerVC
}


/*
 * DON'T EDIT THE CODE BELOW.
 */


func showMailError()
{
    let sendMailErrorAlert = UIAlertController(title: "Email failed to send", message: "Your device fail to send the email", preferredStyle: .alert)

    let dismiss = UIAlertAction(title: "Dale", style: .default, handler: nil)
    sendMailErrorAlert.addAction(dismiss)
    self.present(sendMailErrorAlert, animated: true, completion: nil)
}

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

}

Answer 1

以下是修复黑屏问题的新更新代码。靠近一步。但是现在我在按下发送按钮时从showMailError（）收到错误消息。这是调试器显示的内容

2018-05-14 15：03：40.474236-0400 projectName [2510：835559] [MC]过滤包ID的邮件表帐户：projectName，来源帐户管理：1

import Foundation
import UIKit
import MessageUI

class SendEmailVC: UIViewController // MFMailComposeViewController: Caused black screen
{

@IBAction func SendButton_Tapped(_ sender: UIButton)
{

    if MFMailComposeViewController.canSendMail()
    {
        let mailComposeVC = self.configureMailController()
        self.present(mailComposeVC, animated: true, completion: nil)
    }
    else
    {
        self.showMailError()
    }
}

func configureMailController() -> MFMailComposeViewController
{
    let mailComposerVC = MFMailComposeViewController()

    mailComposerVC.setSubject("Hello")
    mailComposerVC.setMessageBody("How are you doing?", isHTML: true)
    mailComposerVC.setToRecipients(["<b>eddx544@gmail.com</b>"])
    mailComposerVC.mailComposeDelegate = self
    /*
     * mailComposerVC.addAttachmentData( attachment: date,
     mimeType: "String here",
     fileName:  "String here" )
     */
    return mailComposerVC
}


/*
 * DON'T EDIT THE CODE BELOW.
 */


func showMailError()
{
    let sendMailErrorAlert = UIAlertController(title: "Email failed to send", message: "Your device fail to send the email", preferredStyle: .alert)

    let dismiss = UIAlertAction(title: "Dismiss", style: .default, handler: nil)

    sendMailErrorAlert.addAction(dismiss)

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



}

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

单击发送按钮之前的联系按钮时出现黑屏

1 个答案: