在后台运行时有响应的 iPhone 应用程序
我知道您可以在应用程序中播放音乐，它会在后台运行，但看起来它不起作用。当我的应用程序在 iPhone 上启动时，我有以下代码：
pathToAudio = [[NSBundle mainBundle] pathForResource:@"silence" ofType:@"mp3"];
audioURL = [NSURL fileURLWithPath:pathToAudio];
audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:audioURL error:NULL];
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:NULL];
audioPlayer.numberOfLoops = -1;
[audioPlayer play];
结果是，当我将应用程序发送到后台时，它会播放音乐，但其他活动不会运行。例如，在我的应用程序中，我正在监听套接字，尽管音乐在后台播放，但我的应用程序不响应传入消息（它通常在应用程序位于前台时响应）。我做错了什么？我读过，当应用程序在后台播放音乐时，您可以执行其他活动，但它看起来不起作用...
编辑：我有越狱的 iPhone，所以欢迎任何非常规方法。我知道如果我在后台播放无声音频，Apple 会拒绝我的应用程序，而我并不关心它。我只是想知道如何让应用程序在播放音乐或以任何其他方式时在后台运行......也许我需要有 iPhone 4？我有 iPhone 3G。
I know that you can for example play music in you app and it would be running in background but it looks like it's not working. I've this code when my application starts on iPhone:
pathToAudio = [[NSBundle mainBundle] pathForResource:@"silence" ofType:@"mp3"];
audioURL = [NSURL fileURLWithPath:pathToAudio];
audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:audioURL error:NULL];
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:NULL];
audioPlayer.numberOfLoops = -1;
[audioPlayer play];
Result is that it plays music when I send app to background but other activities doesnt run. For example in my app I'm listening to socket and although music plays in background my app doesnt respond to incomming messages (it normally responds when app is in foreground). What do I do wrong? I've read that you can do other activities when playing music when app is in background but it looks like it doesn't work...
Edit: I have jailbroken iPhone so any unconventional methods are welcome. I know that Apple would reject my app if I was playing silent audio in background and I dont care about it. I just want to know how to make app running in background when playing music or in any other way... Maybe I need to have iPhone 4? I have iPhone 3G.
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没有什么，只能在后台运行音频（除了一些特殊情况，如 geoloc notifs 和 VoIP），而不是其他东西。
Nothing, it's only possible to run audio in background (aside with some special cases like geoloc notifs & VoIP), not other stuff.
您需要为 info.plist 文件提供规范，例如 UIBackgroundModes。
You'll need to provide a specification for the info.plist file like the UIBackgroundModes.