Implementing background upload queue with Swift

Author is a professional software developer providing android and iOS development services. More info here.

I’m working on an app that lets users select a bunch of photos, upload and share them with other users. Sounds simple enough: user selects photos, app uploads photos, user shares the album. More realistically though: user selects photos, app starts to upload photos, user figures out this might take some time, user leaves the app to do something else, iOS suspends the app (or even worse terminates it), user comes back to find out the job is not done :( We don’t want that, do we?

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