Ios 使用SwiftUI发送电子邮件

我正在尝试在我的迷你应用程序中实现发送电子邮件功能

下面是我正在使用的代码（取自）：

<代码>导入基础 导入快捷键 导入消息用户界面 func sendmail（）{ 如果MFMailComposeViewController.canSendMail（）{ 让mail=MFMailComposeViewController（） mail.mailComposeDelegate=self mail.setToRecipients（[”you@yoursite.com"]) setMessageBody（“你太棒了！

”，isHTML:true） 当前（邮件，动画：真） }否则{ //显示故障警报 } } func-mailcomosecontroller（u控制器：mfmailcomoseviewcontroller，didFinishWith结果：MFMailComposeResult，错误：error？）{ 控制器。解除（动画：真） } 运行代码时，我会出现以下两个错误：

在范围内找不到self

在范围中找不到存在的文件

---

如何修复它？

您可以使用

UIViewControllerRepresentable

MailComposeViewController

struct MailComposeViewController: UIViewControllerRepresentable {
    
    var toRecipients: [String]
    var mailBody: String
    
    var didFinish: ()->()
    
    func makeCoordinator() -> Coordinator {
        return Coordinator(self)
    }
    
    func makeUIViewController(context: UIViewControllerRepresentableContext<MailComposeViewController>) -> MFMailComposeViewController {
        
        let mail = MFMailComposeViewController()
        mail.mailComposeDelegate = context.coordinator
        mail.setToRecipients(self.toRecipients)
        mail.setMessageBody(self.mailBody, isHTML: true)
        
        return mail
    }
    
    final class Coordinator: NSObject, MFMailComposeViewControllerDelegate {
        
        var parent: MailComposeViewController
        
        init(_ mailController: MailComposeViewController) {
            self.parent = mailController
        }
        
        func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
            parent.didFinish()
            controller.dismiss(animated: true)
        }
    }
    
    func updateUIViewController(_ uiViewController: MFMailComposeViewController, context: UIViewControllerRepresentableContext<MailComposeViewController>) {
        
    }
}

---

另一种可能的解决办法。您可以创建一个单例类并在根控制器上显示

MFMailComposeViewController

。您可以根据需要修改功能。像这样

class MailComposeViewController: UIViewController, MFMailComposeViewControllerDelegate {
    
    static let shared = MailComposeViewController()
    
    func sendEmail() {
        if MFMailComposeViewController.canSendMail() {
            let mail = MFMailComposeViewController()
            mail.mailComposeDelegate = self
            mail.setToRecipients(["you@yoursite.com"])
            mail.setMessageBody("<p>You're so awesome!</p>", isHTML: true)
            UIApplication.shared.windows.first?.rootViewController?.present(mail, animated: true)
        } else {
            // show failure alert
        }
    }
    
    func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
        controller.dismiss(animated: true)
    }
}

---

您在哪里定义了这些方法？看起来

sendmail

不是一个既不是类也不是结构的方法，这是第一个错误的原因之一message@Asesh是的，你说得对。我从未将它用作类或结构的方法，这并不是真正的SwiftUI解决方案。您应该将

MFMailComposeViewController

包装在

UIViewControllerRepresentable

中，而不是创建单例

UIViewController

。谢谢！Xcode不再显示这些错误，尽管点击按钮发送时不会发生任何事情…@DávidPásztor请您进一步解释一下这个想法好吗？：）@PhilippLazarev你能检查一下我的最新答案吗？因为模拟器中没有邮件应用程序。

struct MailView: View {
    @State private var showingMail = false
    
    var body: some View {
        VStack {
            Button("Open Mail") {
                self.showingMail.toggle()
            }
        }
        .sheet(isPresented: $showingMail) {
            MailComposeViewController(toRecipients: ["test@gmail.com"], mailBody: "Here is mail body") {
                // Did finish action
            }
        }
    }
}

class MailComposeViewController: UIViewController, MFMailComposeViewControllerDelegate {
    
    static let shared = MailComposeViewController()
    
    func sendEmail() {
        if MFMailComposeViewController.canSendMail() {
            let mail = MFMailComposeViewController()
            mail.mailComposeDelegate = self
            mail.setToRecipients(["you@yoursite.com"])
            mail.setMessageBody("<p>You're so awesome!</p>", isHTML: true)
            UIApplication.shared.windows.first?.rootViewController?.present(mail, animated: true)
        } else {
            // show failure alert
        }
    }
    
    func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
        controller.dismiss(animated: true)
    }
}

Button(action: {
    MailComposeViewController.shared.sendEmail()
}, label: {
    Text("Send")
})