Swift 4 - UIActivityViewController share to Outlook Subject and Title

Question

I am using UIActivityViewController to share text to Outlook, everything is working fine except for two things, one I can't set a subject line and two I cant set a title of that I am sharing, my text is html table and it is currently shown the first part of it in my implementation (see screenshot) although I'd like to show a preview title.

Is there a way to set the title and a way to set the subject?

Here is my code:

let activityViewController = UIActivityViewController(activityItems : [htmlString], applicationActivities: nil)

activityViewController.popoverPresentationController?.barButtonItem = self.shareButton

self.present(activityViewController, animated: true, completion: nil)

I have tried to set the subject like so:

activityViewController.setValue("This is my subject", forKey: "subject")

But it didn't work

What am I doing wrong?

Here is the screenshot of the title I was talking about:

But it didn't work

i installed outlook but it does not show in list, can u help? — famfamfam, Apr 03 '21 at 05:52

denis_lor · Accepted Answer · 2019-12-14T16:30:37.313

Whatever view controller triggered the sharing should conform to UIActivityItemSource protocol in order to setup: preview title, email subject and as well the content of the email.

You can try out your self this example which triggers sharing on a button tap:

class ViewController: UIViewController, UIActivityItemSource {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }

    @IBAction func sharePressed(_ sender: Any) {
        let item = [self, "Preview Title"] as [Any]

        let activityViewController = UIActivityViewController(activityItems: item, applicationActivities: nil)

        self.present(activityViewController, animated: true, completion: nil)
    }

    func activityViewControllerPlaceholderItem(_ activityViewController: UIActivityViewController) -> Any {
        return ""
    }

    func activityViewController(_ activityViewController: UIActivityViewController, itemForActivityType activityType: UIActivity.ActivityType?) -> Any? {
        return "<html><body><p style=\"background-color: red;\">Email body message with red background</p></body></html>"
    }

    func activityViewController(_ activityViewController: UIActivityViewController, subjectForActivityType activityType: UIActivity.ActivityType?) -> String {
        return "Email Subject"
    }

}

To have this expected output:

Some apps like Outlook and Gmail in different iOS Versions (iOS 11, iOS 12..) behave differently: some take the first line of the body and set it as the Subject. Just be sure to test it out for the iOS version you are targeting and the app that you want to target the sharing functionality to behave correctly. You could also set multiple itemForActivityType to target logic for different apps when sharing.

That has fixed my preview problem, but not my subject line problem subjectForActivityType is not being called — user979331, Dec 14 '19 at 07:32
Maybe that is specifically an issue when sharing with Outlook App? I haven't tried that actually, just tried with the iOS Email App. Maybe can you take a look at that exact problem you mentioned in the comment from this stackoverflow post: https://stackoverflow.com/a/51451433/3564632 and might be the same case? — denis_lor, Dec 14 '19 at 15:03
I think you are right....oh well, people can enter their own subject line. — user979331, Dec 14 '19 at 19:45

Swift 4 - UIActivityViewController share to Outlook Subject and Title

1 Answers1