Use `AVSpeechSynthesizer` with `MPRemoteCommandCenter`

Question

I need to use AVSpeechSynthesizer to read a text to my user.

User will control reading with AirPods, so I need to use MPRemoteCommandCenter.

For now, I need to prepare my audio files using AVSpeechSynthesizer.write(_:toBufferCallback:) the create a playlist and read it using AVQueuePlayer.

It works. But preparing audio files take time. I prefer to use AVSpeechSynthesizer.speak(_:) directly in background mode, and activate it via MPRemoteCommandCenter commands.

Is this possible? Or perhaps any workaround?

Thank you!

Answer 1

i have the same issue, and now figure out the only thing you need to do

try? AVAudioSession.sharedInstance().setCategory(.playback)

at the begining. don't use .duckOthers, .mixWithOthers

addTarget to RemoteCommand

func addRemoteCommandCenter() {
    let rcc = MPRemoteCommandCenter.shared()
    //添加暂停监听
    rcc.pauseCommand.addTarget(self, action: #selector(playOrPauseEvent(_:)))
    //添加播放监听
    rcc.playCommand.addTarget(self, action: #selector(playOrPauseEvent(_:)))
    //下一首
    rcc.nextTrackCommand.addTarget(self, action: #selector(nextCommandEvent(_:)))
    //上一首
    rcc.previousTrackCommand.addTarget(self, action: #selector(previousCammndEvent(_:)))
    //耳机暂停和播放的监听
    rcc.togglePlayPauseCommand.addTarget(self, action: #selector(togglePlayPauseCommand(_:)))
}

at the speechSynthesizer(_:didStart:) and speechSynthesizer(_:willSpeakRangeOfSpeechString:utterance:) update the UI

        let infoCenter = MPNowPlayingInfoCenter.default()        
    infoCenter.nowPlayingInfo = [MPMediaItemPropertyTitle:"Title", MPMediaItemPropertyArtist: "Artist", MPMediaItemPropertyAlbumTitle: "", MPMediaItemPropertyArtwork: MPMediaItemArtwork(boundsSize: CGSize(width: 120, height: 120), requestHandler: { (size) -> UIImage in
           UIImage()
    })]