iOS 13, Custom Image, Title and Subtitle in the Presented Uiactivityviewcontroller

iOS 13, Custom Image, title and subtitle in the presented UIActivityViewController

I have found a solution using UIActivityItemSource

UIActivityItemSource have this protocol activityViewControllerLinkMetadata(_ activityViewController: UIActivityViewController) -> LPLinkMetadata?which we can use to set image title and subtitle for our UIActivityViewController

This is an example:

 public func activityViewControllerLinkMetadata(_ activityViewController: UIActivityViewController) -> LPLinkMetadata? {
    let metadata = LPLinkMetadata()

    metadata.title = "My title" // Preview Title

    // Set image 

        metadata.imageProvider = NSItemProvider(object: image)
        metadata.iconProvider = NSItemProvider(object: image)
        metadata.url = urlImage

   // Set URL for sharing 
        metadata.originalURL = myUrl // Add this if you want to have a url in your share message.

    return metadata
}

And this is the result: I have my custom image and title.

iOS 13 Share Sheet: Changing subtitle/item description

This is really silly, but this is how to do it.

metadata.originalURL = URL(fileURLWithPath: "whatever description you want to put")

And as a note, you don't have to create the file/folder itself.

iOS13 share sheet: how to set preview thumbnail when sharing UIImage

Just pass the image urls to UIActivityViewController not the UIImage objects.
For example:

let imageURLs: [URL] = self.prepareImageURLs()
let activityViewController = UIActivityViewController(activityItems: imageURLs, applicationActivities: nil)
self.present(activityViewController, animated: true, completion: nil)

You can see that the image name and the image properties are shown in the top of the UIActivityViewController. Hope it helps!

How is the title of a UIActivityViewController set?

After a bit of trial-and-error, I have found that changing the placeholder items changes the title displayed in the UIActivityViewController, and that a title appears to be used only for files/URLs.

I provide a variety of placeholder items, most of which are all effectively empty objects of different data types (ie, an array, a dictionary, a data and a print page renderer). Because they are all empty, UIActivityViewController displays no title at all for these.

However, I also provide a URL for a file that will be generated later. I had originally been providing the placeholder for this URL as URL(fileURLWithPath: ""). So I guess that the initial "/" shown as the title really means the file system root directory. I've no idea what the subsequently displayed "System@snap-..." is all about!

But I have found that if I change this particular placeholder item to something like, URL(fileURLWithPath: "Some Text"), then whatever text I provide as the URL (or actually as the file name part of the URL - ie, everything after the last "/", if there is one) is what gets displayed as the UIActivityViewController's title.

So now, at least for this case, I have found a way to control what title is displayed there. And more importantly, to get rid of the gibberish that was being displayed in this case.

I appreciate that the URL in the placeholder should probably be the same as the URL in the actual item, and would therefore have a meaningful name. But there are some times when I don't have the final file name until after the data has been processed and therefore it cannot be known at the time the placeholder is originally provided.

I would still be interested to find out how UIActivityViewController selects a title if there are multiple placeholder items that could be used to generate a useful title. How would one be selected over the other? Why is no title provided for a string item or an attributed string item, but only for file/URL items?

---

Related Topics