How to upload images in background in iOS?

Is it possible to have an iOS app upload files in the background?

Suppose there are many large files that need to be uploaded, but it would not be feasible to request a user to keep an iOS app http://open.Is it possible to have the app upload in the background? When I say background, I mean the user has quit the app and is now working with some other app. Note that these uploads are likely going to take a few minutes to complete.
Answer:

iOS permits apps to declare a long-running task (such as uploading), but iOS will limit the task to 10 minutes or so. After that, be sure you can quit in a good state, otherwise, iOS is likely to terminate the app.

Kerri Shotts at Quora Visit the source

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Other answers

In iOS 7, an app can use the new background transfer API's and/or NSURLSession to upload files in the background.

Keith Lea

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