在NSURLConnection中恢复下载功能 [英] Resume download functionality in NSURLConnection

问题描述

我正在从NSURLConnection类的服务器下载一些非常大的数据。

I am downloading some very large data from a server with the NSURLConnection class.

如何实现暂停功能以便我可以继续下载？

How can I implement a pause facility so that I can resume downloading?

推荐答案

你不能暂停，但你可以取消连接，然后创建一个新的连接，以恢复旧的离开了。但是，您要连接的服务器必须支持Range标头。将其设置为bytes = size_already_downloaded-，它应该在你取消它的地方找到。

You can't pause, per-se, but you can cancel a connection, and then create a new one to resume where the old left off. However, the server you're connecting to must support the Range header. Set this to "bytes=size_already_downloaded-", and it should pick up right where you cancelled it.

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