iOS 后台播放音乐问题记录

1.首先需要将Background Modes开启并选择Audio，

2.在controller中注册后台播放下一首/暂停/前一首的远程监听， 并在viewDidLoad里     [selfbecomeFirstResponder];

#pragma mark -远程控制事件监听

- (BOOL)canBecomeFirstResponder{

   returnYES;

}

- (void)remoteControlReceivedWithEvent:(UIEvent *)event{

   switch (event.subtype) {

       caseUIEventSubtypeRemoteControlPlay:

       caseUIEventSubtypeRemoteControlPause:

            [[FYPlayManagersharedInstance]pauseMusic];

           break;

           

       caseUIEventSubtypeRemoteControlNextTrack:

            [[FYPlayManagersharedInstance]nextMusic];

           break;

           

       caseUIEventSubtypeRemoteControlPreviousTrack:

            [[FYPlayManagersharedInstance]previousMusic];

           

       default:

           break;

    }

}

3.后台播放网络音乐时加载过长会导致app被悬挂，在AppDelegate解决方案如下：

UIBackgroundTaskIdentifier _bgTaskId;

//实现一下backgroundPlayerID:这个方法:

+(UIBackgroundTaskIdentifier)backgroundPlayerID:(UIBackgroundTaskIdentifier)backTaskId

{

    //设置并激活音频会话类别

    AVAudioSession *session = [AVAudioSession sharedInstance];

    [session setCategory:AVAudioSessionCategoryPlayback error:nil];

    [session setActive:YES error:nil];

    //允许应用程序接收远程控制

    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];

    //设置后台任务ID

    UIBackgroundTaskIdentifier newTaskId = UIBackgroundTaskInvalid;

    newTaskId = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:nil];

    if(newTaskId != UIBackgroundTaskInvalid && backTaskId != UIBackgroundTaskInvalid) {

        [[UIApplicationsharedApplication] endBackgroundTask:backTaskId];

    }

    return newTaskId;

}

- (void)applicationWillResignActive:(UIApplication *)application {

    //开启后台处理多媒体事件

    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];

    AVAudioSession *session=[AVAudioSessionsharedInstance];

    [session setActive:YESerror:nil];

    //后台播放

    [session setCategory:AVAudioSessionCategoryPlaybackerror:nil];

    //这样做，可以在按home键进入后台后，播放一段时间，几分钟吧。但是不能持续播放网络歌曲，若需要持续播放网络歌曲，还需要申请后台任务id，具体做法是：

    _bgTaskId=[AppDelegatebackgroundPlayerID:_bgTaskId];

}