ios後台播放音樂

1. //後台播放
AVAudioSession *session = [AVAudioSession sharedInstance];
[session setActive:YES error:nil];
[session setCategory:AVAudioSessionCategoryPlayback error:nil];

2. 讓後台可以處理多媒體的事件
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
Remote-control events originate as commands issued by headsets and external accessories that are intended to control multimedia presented by an application. To stop the reception of remote-control events, you must call endReceivingRemoteControlEvents.

3.系統進入後台運行時，讓程式可以運行一段時間。使用此方法爭取一定的時間，在程式進入後台後處理一些事情。
- (UIBackgroundTaskIdentifier)beginBackgroundTaskWithExpirationHandler:(void(^)(void))handler
This method lets your application continue to run for a period of time after it transitions to the background.
your application could call this method to ensure that had enough time to transfer an important file to a remote server or at least attempt to make the transfer and note any errors. You should not use this method simply to keep your application running after it moves to the background.

轉自： http://www.cnspirit.com/?p=222