I Just Want to Open Ms Outlook App and See Mailto Screen Using Url Scheme at iOS

I just want to open MS Outlook app and see mailto screen using URL Scheme at iOS

ms-outlook://compose?to=joe@example.com&subject=Hello

How do I get mailto links in iOS (safari) to open the Outlook app?

Instead of 'mailto:' protocol you can use below protocol to open outlook app

ms-outlook://compose?to=joe@example.com&subject=Hello

How to open the default mail app on iOS 14 without a compose view?

I ended up half-solving it by asking the user with an alert view about their preference, because I did not find a way to query iOS about it directly.

So first am showing an alert view like this:

func askUserForTheirPreference(in presentingViewController: UIViewController) {
    let alertController = UIAlertController(title: nil, message: "pleaseConfirmWithApp", preferredStyle: .actionSheet)
    alertController.addAction(UIAlertAction(title: "Apple Mail", style: .default) { action in
        self.open(presentingViewController, .applemail)
    })
    alertController.addAction(UIAlertAction(title: "Google Mail", style: .default) { action in
        self.open(presentingViewController, .googlemail)
    })
    alertController.addAction(UIAlertAction(title: "Microsoft Outlook", style: .default) { action in
        self.open(presentingViewController, .outlook)
    })
    alertController.addAction(UIAlertAction(title: "Protonmail", style: .default) { action in
        self.open(presentingViewController, .protonmail)
    })
    alertController.addAction(UIAlertAction(title: "Cancel", style: .cancel) { action in
        os_log("Cancelling", log: Self.log, type: .debug)
    })
    presentingViewController.present(alertController, animated: true)
}

Then, I am responding to the user's choice like this:

func open(_ presentingViewController: UIViewController, _ appType: AppType) {
    switch appType {
    case .applemail: UIApplication.shared.open(URL(string: "message:")!, completionHandler: { handleAppOpenCompletion(presentingViewController, $0) })
    case .googlemail: UIApplication.shared.open(URL(string: "googlegmail:")!, completionHandler: { handleAppOpenCompletion(presentingViewController, $0) })
    case .outlook: UIApplication.shared.open(URL(string: "ms-outlook:")!, completionHandler: { handleAppOpenCompletion(presentingViewController, $0) })
    case .protonmail: UIApplication.shared.open(URL(string: "protonmail:")!, completionHandler: { handleAppOpenCompletion(presentingViewController, $0) })
    }
}

private func handleAppOpenCompletion(_ presentingViewController: UIViewController, _ isSuccess: Bool) {
    guard isSuccess else {
        let alertController = UIAlertController(title: nil, message: "thisAppIsNotInstalled", preferredStyle: .alert)
        alertController.addAction(UIAlertAction(title: "Dismiss", style: .cancel))
        presentingViewController.present(alertController, animated: true)
        return
    }
}

enum AppType {
    case applemail, googlemail, outlook, protonmail
}

A clear limitation of this approach is of course that I am limiting the user to very specific apps (in this case Google Mail, iOS "default" Mail, Microsoft Outlook and ProtonMail).
So this approach does not really scale well.

But at least, you can cover a few favorite ones and go from there based on your users' feedback.

The main reason for jumping through these hoops of asking the first is that, at least at the moment, it seems impossible to get that information from iOS directly.
I also could not find a URL scheme that would always open the chosen default Mail app without showing the compose new email view.

Launch Apple Mail App from within my own App?

Apparently Mail application supports 2nd url scheme - message:// which ( I suppose) allows to open specific message if it was fetched by the application. If you do not provide message url it will just open mail application:

NSURL* mailURL = [NSURL URLWithString:@"message://"];
if ([[UIApplication sharedApplication] canOpenURL:mailURL]) {
    [[UIApplication sharedApplication] openURL:mailURL];
}

Open eMail from App with predefined text in iOS

You can do it using MFMailComposeViewController:

import MessageUI

let mailComposerVC = MFMailComposeViewController()
mailComposerVC.mailComposeDelegate = self
mailComposerVC.setToRecipients(["email@email.com"])
mailComposerVC.setSubject("Subject")
mailComposerVC.setMessageBody("Body", isHTML: false)
self.presentViewController(mailComposerVC, animated: true, completion: nil)

Also, you need to implement mailComposeController:didFinishWithResult:error: from MFMailComposeViewControllerDelegate where you should dismiss MFMailComposeViewController

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