我目前正在学习Swift,并且正在为网络广播创建一个应用。调用此代码时出现错误:MPNowPlayingInfoCenter.default().nowPlayingInfo=[MPMediaItemPropertyArtist:currentTrack.artist,MPMediaItemPropertyTitle:currentTrack.title,MPMediaItemPropertyArtwork:albumArtwork,MPNowPlayingInfoPropertyIsLiveStream:1.0,MPNowPlayingInfoPropertyMediaType:1.