在info.plist文件中添加

下面是后台播放音频的完整测试代码：

引入文件<AVFoundation/AVFoundation.h>

//后台播放音频设置

AVAudioSession *session = [AVAudioSession sharedInstance];

[session setActive:YES error:nil];

[session setCategory:AVAudioSessionCategoryPlayback error:nil];

//让app支持接受远程控制事件

[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];

//播放背景音乐

NSString *musicPath = [[NSBundle mainBundle] pathForResource:@"background" ofType:@"mp3"];

NSURL *url = [[NSURL alloc] initFileURLWithPath:musicPath];

// 创建播放器

player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];

[player prepareToPlay];

[player setVolume:1];

player.numberOfLoops = -1; //设置音乐播放次数  -1为一直循环

[player play]; //播放