音乐播放器类程序后台运行

1.AppDelegate.m

- (void)applicationDidEnterBackground:(UIApplication *)application
{
//开启后台任务，让程序保持运行状态
[application beginBackgroundTaskWithExpirationHandler:nil];
}

2.info.plist

KEY: Required background modes

Item0: App plays audio or streams audio/video using AirPlay



3.设置音频回话类型

/**
*  初始化
*/
+ (void)initialize
{
_soundIDDict = [NSMutableDictionary dictionary];
_audioPlayerDict = [NSMutableDictionary dictionary];

//设置音频回话类型
AVAudioSession *session = [AVAudioSession sharedInstance];
[session setCategory:AVAudioSessionCategorySoloAmbient error:nil];
[session setActive:YES error:nil];
}