UIActivityViewController Subject not working for Outlook

Question

Foe setting subject of share, overriding

   func activityViewController(activityViewController: UIActivityViewController, subjectForActivityType activityType: String?) -> String {
          return "mySubject"
    }

not working for outlook app, while sharing. this method not being called for outlook, works for other apps like mail, gmail etc.

Found that some app like Yelp, Apple maps, Google Maps able to set subject in outlook. How'd one achieve it?

Answer 1

I believe I figured out how this was made to work in those apps. I observed the same behavior in my own app where func activityViewController(_ activityViewController: UIActivityViewController, subjectForActivityType activityType: UIActivityType?) -> String is not being called when choosing the Outlook app. However, I noted the CNN app, as an example, was properly creating a subject line.

The answer it seems is to make the first line of the body text be what you wish the subject to be. I had an asset I was attaching with a URL and so the subject was inserting the URL which I didn't want. However, when I made the subject I did want, the first line of the body in the email, it did then populate the email's subject in Outlook correctly.

So this isn't ideal and certainly the appropriate protocol function should be called, but this does appear to be how others have gotten around what we otherwise cannot fix for Apple or Microsoft.