播放歌曲时播放/暂停按钮不更新

Question

I'm building an music app that can integrate with CarPlay, everything is all right... I can display artist name, title, album name and some button controller on music player. However, there is an issue that when i play any song from CarPlay, the button on CarPlay is not update same as button on iOS device and seek time does not move.

What should I do? I searched many resources to find solution but still yet.

Note: I just only test it on simulator (not real device).

This is show PlayingInfor:

private func nowPlayingInfoOverwrite(time: CMTime) {
    if let nowPlayingItem: PlaylistItem = self.nowPlayingItem {
        let info: NSMutableDictionary = NSMutableDictionary()
        info[MPMediaItemPropertyArtist] = nowPlayingItem.mediaItem?.artist?.name
        info[MPMediaItemPropertyAlbumTitle] = nowPlayingItem.mediaItem?.album?.title
        info[MPMediaItemPropertyTitle] = nowPlayingItem.mediaItem?.title
        info[MPMediaItemPropertyPlaybackDuration] = nowPlayingItem.mediaItem?.playbackDuration
        info[MPMediaItemPropertyArtwork] = nowPlayingItem.mediaItem?.artwork()

        if self.playbackState != .playing {
            info[MPNowPlayingInfoPropertyPlaybackRate] = 1e-6
        } else {
            info[MPNowPlayingInfoPropertyPlaybackRate] = 1
        }
        let sec: TimeInterval = CMTimeGetSeconds(time)
        info[MPNowPlayingInfoPropertyElapsedPlaybackTime] = Int(sec)
        MPNowPlayingInfoCenter.default().nowPlayingInfo = info as? [String: Any]
    } else {
        if !MoviePlayerController.instance.isPlaying() {
            MPNowPlayingInfoCenter.default().nowPlayingInfo = Dictionary()
        }
    }
}

This is handle RemoteCommandEvent:

    let center: MPRemoteCommandCenter = MPRemoteCommandCenter.shared()
    center.pauseCommand.addTarget(self, action: #selector(remoteCommandPause(_ :)))
    center.playCommand.addTarget(self, action: #selector(remoteCommandPlay(_ :)))
    center.stopCommand.addTarget(self, action: #selector(remoteCommandStop(_ :)))
    center.togglePlayPauseCommand.addTarget(self, action: #selector(remoteCommandTogglePlayPause(_ :)))
    center.nextTrackCommand.addTarget(self, action: #selector(remoteCommandNextTrack(_ :)))
    center.previousTrackCommand.addTarget(self, action: #selector(remoteCommandPreviousTrack(_ :)))
    center.nextTrackCommand.isEnabled = true
    center.previousTrackCommand.isEnabled = true

    center.changeShuffleModeCommand.addTarget(self, action: #selector(remoteCommandPause(_ :)))
    center.likeCommand.addTarget(self, action: #selector(remoteCommandPause(_ :)))
    center.changeRepeatModeCommand.addTarget(self, action: #selector(remoteCommandPause(_ :)))
    center.changeShuffleModeCommand.isEnabled = true
    center.likeCommand.isEnabled = true
    center.changeRepeatModeCommand.isEnabled = true

Answer 1

Do you ever register for the remote events in your code? eg

UIApplication.shared.beginReceivingRemoteControlEvents()