Custom IntentResponse return image

Question

My app should donate a shortcut to the shortcuts app, to retrieve a random image. However I am unable to return an image, and do understand how it should be done.

My intents file is as following. As "image" aint a possible return type, I instead return a file.

My code:

class TestIntentHandler: NSObject, TestIntentIntentHandling {
        func handle(intent: TestIntentIntent, completion: @escaping (TestIntentIntentResponse) -> Void) {
            let response = TestIntentIntentResponse(code: .success, userActivity: nil)
            let data = UIImage(named: "test")!.pngData()!
            response.image = INFile(data: data, filename: "tester", typeIdentifier: "png")
            completion(response)
        }
        
      func confirm(intent: TestIntentIntent, completion: @escaping (TestIntentIntentResponse) -> Void) {
        completion(TestIntentIntentResponse(code: .ready, userActivity: nil))
      }
}

But testing the shortcut dont show the image.

Answer 1

Tried to run the same kind of code, and found that Shortcut recognizes the file as image if you give it the right typeIdentifier (UTI) while creating the INFile object. For example, to show a PNG file, you would use "public.png"

Here's an example of Shortcut showing a action result as an image

Now your question could be "Where do I get those identifiers from?". Well, that depends on your target iOS version. You could use UTTypeCreatePreferredIdentifierForTag(iOS <14) or UTType (iOS 14+), extract it directly from the URL if it contains it, or you can read the Apple reference list here

i'll leave here the UTTypeCreatePreferredIdentifierForTag example, courtesy of this answer

let fileExtension = "png" // This could be extracted from an URL
let uti = UTTypeCreatePreferredIdentifierForTag(
    kUTTagClassFilenameExtension,
    fileExtension,
    nil)

... and the URL example, courtesy of this other answer

extension URL {
    var typeIdentifier: String? { (try? resourceValues(forKeys: [.typeIdentifierKey]))?.typeIdentifier }
    var localizedName: String? { (try? resourceValues(forKeys: [.localizedNameKey]))?.localizedName }
}