Get all URLs for resources in sub-directory in Swift

Question

I am attempting to create an array of URLs for all of the resources in a sub-directory in my iOS app. I can not seem to get to the correct path, I want to be able to retrieve the URLs even if I do not know the names (i.e. I don't want to hard code the file names into the code).

Below is a screen shot of the hierarchy, I am attempting to get all the files in the 'test' folder:

Any help is greatly appreciated, I have attempted to use file manager and bundle main path but to no joy so far.

This is the only code I have currently:

let fileManager = FileManager.default
let path = Bundle.main.urls(forResourcesWithExtension: "pdf", subdirectory: "Files/test")

print(path)

I have also tried this code but this prints all resources, I can't seem to specify a sub-directory:

let fm = FileManager.default
let path = Bundle.main.resourcePath!

do {
    let items = try fm.contentsOfDirectory(atPath: path)

    for item in items {
        print("Found \(item)")
    }
} catch {
    // failed to read directory – bad permissions, perhaps?
}

Based on an answer from @vadian , The folders were changed from virtual groups to real folders. Using the following code I was able to get a list of resources:

let fileManager = FileManager.default
    let path = Bundle.main.resourcePath

    let enumerator:FileManager.DirectoryEnumerator = fileManager.enumerator(atPath: "\(path!)/Files/test")!
    while let element = enumerator.nextObject() as? String {
        if element.hasSuffix("pdf") || element.hasSuffix("jpg") { // checks the extension
            print(element)
        }
    }

Answer 1

Consider that the yellow folders are virtual groups, not real folders (although Xcode creates real folders in the project directory). All files in the yellow folders are moved into the Resources directory in the bundle when the app is built.

Real folders in the bundle are in the project navigator.