使用iOS4在后台下载数据 [英] Download data in background with iOS4

问题描述

根据 Kindle V2.5的最新更新，它支持在iOS 4设备上应用程序处于后台时继续下载书籍。

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".

如何在后台下载内容？根据 iOS多任务文档 ，只有音频，voip&可以在后台进行位置更新。而且我还确保NSURLConnection在app变为后台时不会下载新数据。那么Kindle应用程序怎么可能呢？

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?

编辑：我还没有在支持iOS4多任务处理的设备中检查Kindle App。因此，如果有人让我（和社区）知道Kindle应用程序要下载的内容，那将非常有用。

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.

推荐答案

是的，你可以。返回到您提到的文档，并检查在后台完成有限长度任务部分中的代码。通过这种方式，您可以在后台运行通用任务，包括访问网络和上传文件。

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.

编辑：我之前在SO上回答了类似的问题，检查一下，< a href =https://stackoverflow.com/questions/4594348/iphone-connecting-to-server-in-background/4594735#4594735> iphone - 在后台连接到服务器

Edited: I answered a similar question on SO before, check this, iphone - Connecting to server in background

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