iphone - 当应用程序进入后台时 MPMoviePlayer 继续播放

Question

我正在使用 iOS5。

我正在开发 HTTPLivestream 项目。这里我使用 MPMovieplayer ，我的问题是当应用程序转到后台时没有音频。我正在后台模式下更改 plist 为音频。但是没有结果请帮助我。

应用删除

- (void)applicationDidEnterBackground:(UIApplication *)application {
  [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
  [[AVAudioSession sharedInstance] setActive: YES error: nil];

  UIApplication *app = [UIApplication sharedApplication];
  backgroundTask = [app beginBackgroundTaskWithExpirationHandler:^{
  }];

  dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
  });
}

RadioControlView

  NSString *path =[[NSString alloc] initWithString:@"http://*******/alayam/alayam/playlist.m3u8"];

  audioUrl=[NSURL URLWithString:path];

  appDelegate.player =  [[MPMoviePlayerController alloc] initWithContentURL:audioUrl];
                                   [[NSNotificationCenter defaultCenter] addObserver:self 
                                                         selector:@selector(loadStateDidChange:) 
                                                             name:MPMoviePlayerLoadStateDidChangeNotification 
                                                           object:appDelegate.player];
                if ([appDelegate.player respondsToSelector:@selector(loadState)]) 
                {
                    [appDelegate.player setControlStyle:MPMovieControlModeVolumeOnly];
                    [appDelegate.player setFullscreen:YES];
                    [appDelegate.player prepareToPlay];
                 }

- (void)loadStateDidChange:(NSNotification *)notification
      {   
        [[NSNotificationCenter defaultCenter]removeObserver:self name:MPMoviePlayerLoadStateDidChangeNotification object:appDelegate.player];

      }

提前致谢

Answer 1

需要结合ios5中的后台支持设置进行远程控制设置-

//注册您的应用程序以进行远程控制

if([[UIApplication sharedApplication]  respondsToSelector:@selector(beginReceivingRemoteControlEvents)])
    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];


// allows you to play in the background when app is suspended in iOS5
[[AVAudioSession sharedInstance] setDelegate: self];
[[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback error:nil];

将这两个设置放在应用程序 didFinishLaunching 委托(delegate)中