锁屏 iPod 控制不适用于 Spotify 音乐播放器

Question

我将 Spotify 播放器添加到我的应用程序中，该应用程序还使用 MPMusicPlayerController 播放音乐。当从 Spotify 播放音乐并且屏幕被锁定时，当用户在锁定屏幕上按下这些按钮时，不会收到 play/pause 和 FFW/RWD 的远程控制事件。

如果 MPMusicPlayerController 正在播放音乐，我可以根据以下代码接收远程控制事件：

-(void) ViewDidLoad {
    ...
    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
    [self becomeFirstResponder];
    ...
}

和

- (BOOL) canBecomeFirstResponder
{
    return YES;
}

- (void) remoteControlReceivedWithEvent: (UIEvent*) event
{
    // see [event subtype] for details
    if (event.type == UIEventTypeRemoteControl) {
        // We may be receiving an event from the lockscreen
        switch (event.subtype) {
            case UIEventSubtypeRemoteControlTogglePlayPause:
            case UIEventSubtypeRemoteControlPlay:
            case UIEventSubtypeRemoteControlPause:
                // User pressed play or pause from lockscreen
                [self playOrPauseMusic:nil];
                break;

            case UIEventSubtypeRemoteControlNextTrack:
                // User pressed FFW from lockscreen
                [self fastForwardMusic:nil];
                break;

            case UIEventSubtypeRemoteControlPreviousTrack:
                // User pressed rewind from lockscreen
                [self rewindMusic:nil];
                break;

            default:
                break;
        }
    }
}

虽然当应用程序进入后台时可以看到 iPod 控件，但当我按下暂停时它们没有响应。相反，当我按下暂停键时，iPod 控件会消失。当 Spotify 等流式音频从锁定屏幕在后台播放时，需要添加什么才能检测 play/pause 和 FFW/RWD？

Answer 1

我相信我运行过去就喜欢这个。如果我没记错的话我在

中添加了

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

以及

- (BOOL) canBecomeFirstResponder { return YES; }

应用程序委托（这也是我的音频控制器所在的位置）。在我想捕获 UIEventTypeRemoteControl 通知期间，我遇到了 UIViewControllers 不存在的问题。

试试看是否有帮助。

Answer 2

经过进一步调查，我发现如果在我的应用程序进入后台并接收到远程控制事件时包含以下代码，iPod控件不会消失。

// Set up info center to display album artwork within ipod controls (needed for spotify)
MPMediaItemArtwork *ipodControlArtwork = [[MPMediaItemArtwork alloc]initWithImage:artworkImage];
[MPNowPlayingInfoCenter defaultCenter].nowPlayingInfo = [NSDictionary dictionaryWithObjectsAndKeys:nowPlayingTitle, MPMediaItemPropertyTitle,
                                                         nowPlayingArtist, MPMediaItemPropertyArtist, ipodControlArtwork, MPMediaItemPropertyArtwork,  [NSNumber numberWithDouble:0.0], MPNowPlayingInfoPropertyPlaybackRate, nil];

锁屏 iPod 控制不适用于 Spotify 音乐播放器

Lock Screen iPod Controls Not Working With Spotify Music Player

ios

background-process

spotify

lockscreen

mpmusicplayercontroller