问题
As per the latest update of Kindle V2.5, it has support of "continue downloading books while the app is in the background on iOS 4 devices".
How is it possible to download content in background? As per the iOS multitasking documentation, only audio, voip & location updates are possible in background. And I've also maken sure that NSURLConnection doesn't download new data work while app goes background. Then how's it possible with Kindle app?
Edit: I haven't checked Kindle App in iOS4 multitasking enabled device. So if anyone let me (& community) know what exactly Kindle app does to download, that would be very much helpful.
回答1:
Yes you can. Go back to the document you mentioned, and check the code at the Completing a Finite Length Task in the Background section. In this way you can run generic tasks in the background, including accessing the network and uploading files.
Edited: I answered a similar question on SO before, check this, iphone - Connecting to server in background
回答2:
Completing a Finite Length Task in the Background
You can use these methods to do pretty much anything you want, but you've got to finish it all up in <10 minutes. I use it to continue uploading an image after the app has closed.
来源：https://stackoverflow.com/questions/4704037/download-data-in-background-with-ios4