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I need to save a big file, sometime it takes a very long time to finish, user might just close the application. I am wondering whether the iPhone SDK could take over the unfinished big task.
Appears iPhone’s own mail system could do background send. I prepared a email, click send, then close the mail app immediately. In home page, after several seconds, I heard a sound and the email was delivered.
You’re out of luck. Only Apple’s own apps are allowed to operate in the background. But I think your app gets some time to finish up when the user closes the app.