解决关于如何实现锁屏后继续播放音乐的问题

锁屏后继续播放其实就是利用了Audio session这个feature，具体可以看看apple的文档里面关于Audio session的部分，我是用的AVFoundation.framework这个库来播放音乐的。

全部代码如下：

// Registers this class as the delegate of the audio session. [[AVAudioSession sharedInstance] setDelegate: self ]; [[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback error: nil ]; UInt32 doSetProperty = 0; //The C Style function call AudioSessionSetProperty ( kAudioSessionProperty_OverrideCategoryMixWithOthers, sizeof (doSetProperty), &doSetProperty ); // Activates the audio session. NSError *activationError = nil ; [[AVAudioSession sharedInstance] setActive: YES error: &activationError]; //alloc a new player AVAudioPlayer *newPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL: @ "your audio file path" error: nil ]; //prepare and set delegate [newPlayer prepareToPlay]; [newPlayer setDelegate: self ]; //play audio [newPlayer play]; //pause or stop audio [newPlayer pause]; [newPlayer stop]; //restart audio playing if (newPlayer.playing) { [newPlayer pause]; newPlayer.currentTime = 0; [newPlayer play]; }