How do iOS apps automatically upload photos (or anything) in the background?
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I am aware of two apps that do this, Google+ and Everpix. I'm wondering how they do this, at the API level, as it would seem to require more background privileges than iOS provides (last I checked).
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Answer:
iOS has had background execution for some time now. When an app is put into the background, it can request to continue execution for a limited period of time to do whatever it needs to do. Finish an upload, for example. Apps that need to run in the background continuously-- audio apps like Pandora, for example-- can request background operation for that specific purpose. See Apple's docs for details, for example at https://developer.apple.com/library/ios/#documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/ManagingYourApplicationsFlow/ManagingYourApplicationsFlow.html
Tom Harrington at Quora Visit the source
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