使用SwiftUI发送邮件

情景复现

给我的iOS应用“存钱猪猪”写用户反馈功能时，想要实现使用Swift发送邮件的功能，主要是给一个用户的反馈渠道，而且这个反馈渠道很多应用都在使用。

配置MessageUI

首先，打开Xcode并点击左侧的项目名称，找到TARGETS -> General -> Frameworks,Libraries,and Embedded Content，点击添加按钮。

输入“MessageUI”，可以在下面找到

MessageUI.framework

然后添加到我们的项目中。

实现代码

代码层面则需要创建一个结构体MailComposeViewController

import SwiftUI
import MessageUI

struct MailComposeViewController: UIViewControllerRepresentable {
    typealias UIViewControllerType = MFMailComposeViewController
    
    var recipients: [String]
    var subject: String
    var body: String
    var resultCallback: ((MFMailComposeResult) -> Void)?
    
    class Coordinator: NSObject, MFMailComposeViewControllerDelegate {
        var parent: MailComposeViewController
        
        init(parent: MailComposeViewController) {
            self.parent = parent
        }
        
        func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
            parent.resultCallback?(result)
            controller.dismiss(animated: true)
        }
    }
    
    func makeCoordinator() -> Coordinator {
        return Coordinator(parent: self)
    }
    
    func makeUIViewController(context: Context) -> MFMailComposeViewController {
        let vc = MFMailComposeViewController()
        vc.mailComposeDelegate = context.coordinator
        vc.setToRecipients(recipients)
        vc.setSubject(subject)
        vc.setMessageBody(body, isHTML: false)
        return vc
    }
    
    func updateUIViewController(_ uiViewController: MFMailComposeViewController, context: Context) {}
}

View文件

import SwiftUI
import UIKit
import MessageUI

struct ContentView: View {
    
    @State private var showMailComposer = false
    @State private var mailResult: MFMailComposeResult?
    
    var body: some View {
        VStack {
            // 问题反馈按钮
            MenuItem(menuItem: MenuItemModel(iconName: "questionmark.circle", title: Feedback, action: {
                self.showMailComposer = true        // 调取邮件Sheet页
            }))
        }
        // 邮件Sheet页
        .sheet(isPresented: $showMailComposer) {
            MailComposeViewController(
                recipients: ["fangjunyu.com@gmail.com"],    // 配置邮件地址
                subject: "Feedback",                        // 配置邮件主题
                body: "Hi fangjunyu,\n\n",                  // 配置邮件内容
                resultCallback: { result in
                    self.mailResult = result
                    self.showMailComposer = false
                })
        }
    }
}

#Preview {
    ContentView(showSheet: .constant(true),showSettings: .constant(true))
}

在View中，我们需要引入MessageUI，配置两个变量，在问题反馈按钮中配置

self.showMailComposer = true

以及在我们的邮件弹出Sheet页中配置我们要发送的邮件内容。

实现效果