SwiftUI：发送电子邮件

在UIViewControllerSwift 的正常情况下，我使用此代码发送邮件。

let mailComposeViewCOntroller= configuredMailComposeViewController()

mailComposeViewController.navigationItem.leftBarButtonItem?.style = .plain
mailComposeViewController.navigationItem.rightBarButtonItem?.style = .plain
mailComposeViewController.navigationBar.tintColor = UIColor.white

if MFMailComposeViewController.canSendMail() {
    self.present(mailComposeViewController, animated: true, completion: nil)
} else {
    self.showSendMailErrorAlert()
}

如何在SwiftUI中实现相同目标？

我需要使用UIViewControllerRepresentable吗？

如前所述，您需要将组件移植到SwiftUIvia UIViewControllerRepresentable。

这是一个简单的实现：

struct MailView: UIViewControllerRepresentable {

    @Binding var isShowing: Bool
    @Binding var result: Result?

    class Coordinator: NSObject, MFMailComposeViewControllerDelegate {

        @Binding var isShowing: Bool
        @Binding var result: Result?

        init(isShowing: Binding,
             result: Binding?>) {
            _isShowing = isShowing
            _result = result
        }

        func mailComposeController(_ controller: MFMailComposeViewController,
                                   didFinishWith result: MFMailComposeResult,
                                   error: Error?) {
            defer {
                isShowing = false
            }
            guard error == nil else {
                self.result = .failure(error!)
                return
            }
            self.result = .success(result)
        }
    }

    func makeCoordinator() -> Coordinator {
        return Coordinator(isShowing: $isShowing,
                           result: $result)
    }

    func makeUIViewController(context: UIViewControllerRepresentableContext) -> MFMailComposeViewController {
        let vc = MFMailComposeViewController()
        vc.mailComposeDelegate = context.coordinator
        return vc
    }

    func updateUIViewController(_ uiViewController: MFMailComposeViewController,
                                context: UIViewControllerRepresentableContext) {

    }
}

struct ContentView: View {

    @State var result: Result? = nil
    @State var isShowingMailView = false

    var body: some View {
        ZStack {
            VStack {
                Button(action: {
                    self.isShowingMailView.toggle()
                }) {
                    Text("Show mail view")
                }
                if result != nil {
                    Text("Result: \(String(describing: result))")
                    .lineLimit(nil)
                }
            }
            if (isShowingMailView) {
                mailView()
                .transition(.move(edge: .bottom))
                .animation(.default)
            }
        }


    }

    private func mailView() -> some View {
        MFMailComposeViewController.canSendMail() ?
            AnyView(MailView(isShowing: $isShowingMailView, result: $result)) :
            AnyView(Text("Can't send emails from this device"))
    }
}