iOS AVPlayer Play Audio

var player: AVPlayer = AVPlayer(playerItem: nil)

func play(with url: URL) throws {
        
    let session: AVAudioSession = AVAudioSession.sharedInstance()
    try session.setCategory(.playback)
        
    let asset: AVURLAsset = AVURLAsset(url: url)
    let playItem: AVPlayerItem = AVPlayerItem(asset: asset)
    player = AVPlayer(playerItem: playItem)
    
    player.play()
}

let session = AVAudioSession.sharedInstance()
do {
    try session.setCategory(.playback)
} catch {
     print("Failed to set audio session category.")
}

extension TimeInterval {
    var cmTime: CMTime {
        return CMTimeMakeWithSeconds(self, preferredTimescale: 600)
    }
}
extension CMTime {
    var timeInterval: TimeInterval {
        return CMTimeGetSeconds(self)
    }
}

@objc 
func handleInterruption(notification: Notification) {
    guard let userInfo = notification.userInfo,
        let typeValue = userInfo[AVAudioSessionInterruptionTypeKey] as? UInt,
        let type = AVAudioSession.InterruptionType(rawValue: typeValue) else {
            return
    }

    // Switch over the interruption type.
    switch type {

    case .began:
        // An interruption began. Update the UI as necessary.

    case .ended:
       // An interruption ended. Resume playback, if appropriate.
        guard let optionsValue = userInfo[AVAudioSessionInterruptionOptionKey] as? UInt else { return }
        let options = AVAudioSession.InterruptionOptions(rawValue: optionsValue)
        if options.contains(.shouldResume) {
            // An interruption ended. Resume playback.
        } else {
            // An interruption ended. Don't resume playback.
        }

    default: ()
    }
}

@objc
func handleFailedToPlayToEndTime(_ notification: Notification) {
    let error = notification.userInfo?[AVPlayerItemFailedToPlayToEndTimeErrorKey] as? Error
    print(error)
}

func setupRemoteCommand() {

    let center = MPRemoteCommandCenter.shared()

    // 不使用 上一首
    center.previousTrackCommand.isEnabled = false

    // 不使用 下一首
    center.nextTrackCommand.isEnabled = false

    // 使用 快轉
    center.skipForwardCommand.isEnabled = true
    // 這裡是快轉秒數，根據經驗，如果不是 5 的倍數，畫面只會顯示快轉的符號，不會包含數字
    center.skipForwardCommand.preferredIntervals = [NSNumber(15)]
    center.skipForwardCommand.addTarget(self, action: #selector(skipForwardCommand(_:)))

    // 使用 倒轉
    center.skipBackwardCommand.isEnabled = true
    // 這裡是倒轉秒數，根據經驗，如果不是 5 的倍數，畫面只會顯示倒轉的符號，不會包含數字
    center.skipBackwardCommand.preferredIntervals = [NSNumber(15)]
    center.skipBackwardCommand.addTarget(self, action: #selector(skipBackwardCommand(_:)))

    // 使用 播放
    center.playCommand.isEnabled = true
    center.playCommand.addTarget(self, action: #selector(playCommand(_:)))

    // 使用 暫停
    center.pauseCommand.isEnabled = true
    center.pauseCommand.addTarget(self, action: #selector(pauseCommand(_:)))

    // 設定進度條可以拖動
    center.changePlaybackPositionCommand.isEnabled = true
    center.changePlaybackPositionCommand.addTarget { event in
        guard let positionEvent = event as? MPChangePlaybackPositionCommandEvent else { return .commandFailed }
        let time: TimeInterval = positionEvent.positionTime
        // 根據使用者拖動到的位置的時間做調整
        return .success
    }
}

@objc
func playCommand(_ event: MPRemoteCommandEvent) -> MPRemoteCommandHandlerStatus {
    // 根據接收到的 command 做對應的處理，若是無法做對應的處理， return MPRemoteCommandHandlerStatus.commandFailed
    return .success
}

// 設定
MPNowPlayingInfoCenter.default().nowPlayingInfo = [
    // 你要顯示的標題-例如: 專輯名稱
    MPMediaItemPropertyTitle: "iOS@Taipei", 
    // 你要顯示的圖篇標題-例如: 歌曲名稱
    MPMediaItemPropertyAlbumTitle: "Nick", 
    // 這是只當下的播放速率，系統要知道你用的播放速率，才能用一樣的速率去更新播放的時間
    MPNowPlayingInfoPropertyPlaybackRate: 1, 
    // 現在播放到的位置
    MPNowPlayingInfoPropertyElapsedPlaybackTime: 10, 
    // 這一首聲音的總長度
    MPMediaItemPropertyPlaybackDuration: 180, 
    // 這裡要放入的是你要顯示的圖片大小跟圖片
    MPMediaItemPropertyArtwork: MPMediaItemArtwork(boundsSize: CGSize(width: 100, height: 100)) { size -> UIImage in
        print(size)
        return UIImage()
    }
]

// 清除
MPNowPlayingInfoCenter.default().nowPlayingInfo = nil