xcode - copy a folder structure into my app bundle

When you add a directory to Xcode, there is a tickbox (on by default) to convert folders into groups.

Turn that off, and it will do what you want.

It is still the same in Xcode 12: Check the Create folder references box when adding the root folder of your folder structure to the project.

Group hierarchy in project navigator - before

Source folder hierarchy in Finder

Add files to folder

Group hierarchy in project navigator - after

Resulting folder hierarchy in-app bundle

To access the resources in code, specify the subdirectory path in your call to Bundle.url():

Bundle.main.url(forResource: "blabla",
                withExtension: "txt",
                subdirectory: "A/B/C/D")

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