Send mail with file attachment

It seems that attachment in mailto: URLs are not supported on macOS (not always at least...details seems sketchy dependent on where you look on the internet :))

What you can use instead I found out from this blog post, is an instance of NSSharingService documented here

Here is an example demonstrating how to use it.

And in your case you could do something like:

let email = "your email here"
let path = "/Users/myname/Desktop/report.txt"
let fileURL = URL(fileURLWithPath: path)

let sharingService = NSSharingService(named: NSSharingServiceNameComposeEmail)
sharingService?.recipients = [email] //could be more than one
sharingService?.subject = "subject"
let items: [Any] = ["see attachment", fileURL] //the interesting part, here you add body text as well as URL for the document you'd like to share

sharingService?.perform(withItems: items)

Update

So @Spire mentioned in a comment below that this won't attach a file.

It seems there is a gotcha to be aware of.

For this to work you need to look into your App Capabilities.

You can either:

• disable App Sandbox
• enable read access for the folders from where you would like to fetch content.

I've attached a couple of screenshots.

Here is how this looks if I have disabled App Sandbox under Capabilities

And here is an image where I have enabled App Sandbox and allowed my app to read content in my Downloads folder

If I do the above, I can access my file called document.txt, located in my Downloads folder, using this URL

let path = "/Users/thatsme/Downloads/document.txt"
let fileURL = URL(fileURLWithPath: path)

And attach that to a mail

Hope that helps you.