ASIHTTPRequest和后台下载 [英] ASIHTTPRequest and background download

问题描述

我打算使用ASIHttprequest下载mp3文件。
i将需要使用队列，因为可以同时下载多个。

I was planning to use ASIHttprequest to download an mp3 file. i will need to use queues because there can be multiple simultaneous downloads.

我看到您可以使用

[request setShouldContinueWhenAppEntersBackground:YES];

如果要支持后台执行...
如果文件在后台完成，我该怎么处理这个？

if you want to support background execution... If the file completes in the background, how can i handle this?

会不会打电话给代表？
如果应用程序在代理被调用时处于背景状态，我可以从委托中获得那些通知徽章？

will the delegates be called anyway? can i make one of those notification badges from the delegate if the app was in background whenn the delegate was called?

PS：我在iOS4上，支持后台exec。

PS: I AM on iOS4, and background exec is supported.

推荐答案

应该仍然会调用 requestFinished 方法在下载之前调用 endBackgroundTask：但是，为了确保您希望执行的功能（通知徽章或某些东西），您应该使用 UIBackgroundTask 。

The requestFinished method should still be called before the endBackgroundTask: is called on the download; however, to ensure the functionality you want gets executed (a notification badge or something), you should use a UIBackgroundTask.

基本上，创建一个新的后台任务，并在委托完成的方法中使用 beginBackgroundTaskWithExpirationHandler：，然后在后台任务中执行任何所需的操作（请参阅apple dev指导此处）。

Basically the idea is that you create a new background task and use beginBackgroundTaskWithExpirationHandler: in the delegate finished method and then do whatever you want in the background task (see the apple dev guide about it here).

完成后，请确保在任务上调用 endBackgroundTask ！

Make sure you call endBackgroundTask on your task after you are done!

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