对于像我这样的人，想要更好的解决方案而不会干扰用户屏幕的人，我在这篇Medium的
文章中找到了一个非常好的解决方案。该解决方案类似于@Mahmud Assan的答案，但具有更多电子邮件应用程序选项和带错误提示的应用程序警报。
我替换了一些代码来实现打开更多电子邮件应用程序的方法，而不仅仅是Mail或Gmail。
首先，请记得在
Info.plist中添加相应的信息，例如我的情况：
<key>LSApplicationQueriesSchemes</key>
<array>
<string>googlegmail</string>
<string>ms-outlook</string>
<string>readdle-spark</string>
<string>ymail</string>
</array>
接下来，您需要创建一个新的swift文件，其中包含以下代码：
import SwiftUI
import MessageUI
class EmailHelper: NSObject {
static let shared = EmailHelper()
private override init() {}
}
extension EmailHelper {
func send(subject: String, body: String, to: [String]) {
let scenes = UIApplication.shared.connectedScenes
let windowScene = scenes.first as? UIWindowScene
guard let viewController = windowScene?.windows.first?.rootViewController else {
return
}
if !MFMailComposeViewController.canSendMail() {
let subjectEncoded = subject.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!
let bodyEncoded = body.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!
let mails = to.joined(separator: ",")
let alert = UIAlertController(title: "Cannot open Mail!", message: "", preferredStyle: .actionSheet)
var haveExternalMailbox = false
if let url = createEmailUrl(to: mails, subject: subjectEncoded, body: bodyEncoded), UIApplication.shared.canOpenURL(url) {
haveExternalMailbox = true
alert.addAction(UIAlertAction(title: "Gmail", style: .default, handler: { (action) in
UIApplication.shared.open(url)
}))
}
if haveExternalMailbox {
alert.message = "Would you like to open an external mailbox?"
} else {
alert.message = "Please add your mail to Settings before using the mail service."
if let settingsUrl = URL(string: UIApplication.openSettingsURLString),
UIApplication.shared.canOpenURL(settingsUrl) {
alert.addAction(UIAlertAction(title: "Open Settings App", style: .default, handler: { (action) in
UIApplication.shared.open(settingsUrl)
}))
}
}
alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
viewController.present(alert, animated: true, completion: nil)
return
}
let mailCompose = MFMailComposeViewController()
mailCompose.setSubject(subject)
mailCompose.setMessageBody(body, isHTML: false)
mailCompose.setToRecipients(to)
mailCompose.mailComposeDelegate = self
viewController.present(mailCompose, animated: true, completion: nil)
}
private func createEmailUrl(to: String, subject: String, body: String) -> URL? {
let subjectEncoded = subject.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!
let bodyEncoded = body.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!
let gmailUrl = URL(string: "googlegmail://co?to=\(to)&subject=\(subjectEncoded)&body=\(bodyEncoded)")
let outlookUrl = URL(string: "ms-outlook://compose?to=\(to)&subject=\(subjectEncoded)")
let yahooMail = URL(string: "ymail://mail/compose?to=\(to)&subject=\(subjectEncoded)&body=\(bodyEncoded)")
let sparkUrl = URL(string: "readdle-spark://compose?recipient=\(to)&subject=\(subjectEncoded)&body=\(bodyEncoded)")
let defaultUrl = URL(string: "mailto:\(to)?subject=\(subjectEncoded)&body=\(bodyEncoded)")
if let gmailUrl = gmailUrl, UIApplication.shared.canOpenURL(gmailUrl) {
return gmailUrl
} else if let outlookUrl = outlookUrl, UIApplication.shared.canOpenURL(outlookUrl) {
return outlookUrl
} else if let yahooMail = yahooMail, UIApplication.shared.canOpenURL(yahooMail) {
return yahooMail
} else if let sparkUrl = sparkUrl, UIApplication.shared.canOpenURL(sparkUrl) {
return sparkUrl
}
return defaultUrl
}
}
extension EmailHelper: MFMailComposeViewControllerDelegate {
func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
controller.dismiss(animated: true, completion: nil)
}
}
现在，前往您想要实施此操作的视图：
struct OpenMailView: View {
var body: some View {
Button("Send email") {
EmailHelper.shared.send(subject: "Help", body: "", to: ["email@gmail.com"])
}
}
}
