An example project looking at how to implement background transfers on iOS as shown in this article - https://williamboles.com/keeping-things-going-when-the-user-leaves-with-urlsession-and-background-transfers/
In order to run this project, you will need to register with TheCatAPI to get a x-api-key token to access TheCatAPI's API (which the project uses to get its example content). Once you have your x-api-key, add it to the project as the value of the APIKey property in the NetworkService class and the project should now run. If you have any trouble getting the project to run, please create an issue.