MFMailComposeViewController视图不会关闭第二次 [英] MFMailComposeViewController view does not dismiss 2nd time

问题描述

我有我认为是一个独特的问题。我无法让我的电子邮件窗口关闭。我正在使用Xcode 8。

电子邮件在第一次打开它时正确关闭，但如果我再次打开它，则不会。如果我按取消，它不会给我删除草稿的选项。如果我按发送电子邮件发送，但窗口不会关闭。

我的代码如下。第一次正确调用 mailComposeController ，但是它再也不会被调用了。有没有人对我缺少什么有任何想法？

  let mail = MFMailComposeViewController（）
 func sendEmail（body： String，subject：String）{
如果MFMailComposeViewController.canSendMail（）{
 mail.mailComposeDelegate = self 
 
 mail.setSubject（subject）
 mail.setMessageBody（ \（body），isHTML：false）
 
如果let data =（body as NSString）.data（using：String.Encoding.utf8.rawValue）{
 //附加文件
 mail.addAttachmentData（data，mimeType：text / plain，fileName：data.txt）
} 
 
 present（mail，animated：true）
} else {
 // show failure alert 
} 
} 
 
 func mailComposeController（_ controller：MFMailComposeViewController，didFinishWith result：MFMailComposeResult，error：Error？）{ 
 controller.dismiss（动画：true，completion：nil）
} 
  

解决方案例

您需要每次创建一个新的 MFMailComposeViewController 。在 sendEmail 中移动邮件声明

  func sendEmail（body：String，subject：String）{
如果MFMailComposeViewController.canSendMail（）{
 
 //创建一个新的MFMailComposeViewController ... 
 let mail = MFMailComposeViewController（）
 
 mail.mailComposeDelegate = self 
 
 mail.setSubject（subject）
 mail.setMessageBody（\（body），isHTML ：false）
 
如果let data =（body as NSString）.data（using：String.Encoding.utf8.rawValue）{
 //附加文件
 mail.addAttachmentData数据，mimeType：text / plain，fileName：data.txt）
} 
 
 present（mail，animated：true）
} else {
 // show failure alert 
} 
} 
  

至于为什么...？ / p>

I have what I believe is a unique problem. I am having trouble getting my email window to dismiss. I am using Xcode 8.

The email dismisses correctly the first time I open it, but if I open it again it won't. If I press "Cancel" it does not give me the option to "Delete Draft". If I press "Send" the email is sent, but the window does not dismiss.

My code is below. The mailComposeController gets called correctly the first time, but it never gets called a second time. Does anyone have any ideas about what I am missing?

let mail = MFMailComposeViewController()
func sendEmail(body: String, subject: String) {
    if MFMailComposeViewController.canSendMail() {
        mail.mailComposeDelegate = self

        mail.setSubject(subject)
        mail.setMessageBody("\(body)", isHTML: false)

        if let data = (body as NSString).data(using: String.Encoding.utf8.rawValue){
            //Attach File
            mail.addAttachmentData(data, mimeType: "text/plain", fileName: "data.txt")
        }

        present(mail, animated: true)
    } else {
        // show failure alert
    }
}

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

解决方案

You need to create a new MFMailComposeViewController each time. Moving your mail declaration inside sendEmail works…

func sendEmail(body: String, subject: String) {
    if MFMailComposeViewController.canSendMail() {

       // Create a new MFMailComposeViewController…
       let mail = MFMailComposeViewController()

        mail.mailComposeDelegate = self

        mail.setSubject(subject)
        mail.setMessageBody("\(body)", isHTML: false)

        if let data = (body as NSString).data(using: String.Encoding.utf8.rawValue){
            //Attach File
            mail.addAttachmentData(data, mimeType: "text/plain", fileName: "data.txt")
        }

        present(mail, animated: true)
    } else {
        // show failure alert
    }
}

As to why…?

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