播放歌曲时播放/暂停按钮不更新

Question

我正在构建一个可以与 CarPlay 集成的音乐应用程序，一切都很好……我可以在音乐播放器上显示艺术家姓名、标题、专辑名称和一些按钮控制器。但是，当我从 CarPlay 播放任何歌曲时，CarPlay 上的按钮不会像 iOS 设备上的按钮那样更新，并且搜索时间不会移动。

我该怎么办？我搜索了许多资源以找到解决方案，但仍然没有。

注意：我只是在模拟器（不是真实设备）上测试它。

这是 PlayingInfor 节目：

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()
        }
    }
}

这是句柄 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

您是否曾经在代码中注册过远程事件？例如

UIApplication.shared.beginReceivingRemoteControlEvents()