关闭音频播放?

时间:2019-03-07 18:00:30

标签: ios iphone xcode avfoundation swift4.2

我正在使用AVPlayer播放URL中的音频。一切正常,但是当我在不同的ViewController中时,我不知道如何停止当前的音频播放,我不想在player.pause()中呼叫viewWillDisappear(),因为我想停止在特定情况下可以使用,但我仍希望在应用程序处于非活动状态时在后台播放音频。

我在Xcode应用程序设置中启用了此功能,以便在应用程序处于非活动状态时进行后台播放enter image description here

  
    

第二个问题:我可以提高这堂课吗?还是可以吗?

  
protocol AVPlayerServiceDelegate {
    func playerDidUpdateCurrentPlayingTime(_ time: CMTime)

}

class AVPlayerService {
    static let instance = AVPlayerService()

    private var audioPlayer: AVPlayer!
    public weak var delegate: AVPlayerServiceDelegate?

    func setupPlayer(forURL url: URL) {
        let playerItem: AVPlayerItem = AVPlayerItem(url: url)
        audioPlayer = AVPlayer(playerItem: playerItem)
        audioPlayer.play()

        audioPlayer.addPeriodicTimeObserver(forInterval: CMTimeMakeWithSeconds(1, preferredTimescale: 1), queue: DispatchQueue.main) { (CMTime) -> Void in
            if self.audioPlayer.currentItem?.status == .readyToPlay {
                self.delegate?.playerDidUpdateCurrentPlayingTime(self.audioPlayer.currentTime())
            }
        }
    }

    var isPlaying: Bool {
        return audioPlayer.isPlaying
    }

    var isPaused: Bool {
        return audioPlayer.isPaused
    }

    var rate: Float {
        return audioPlayer.rate
    }

    func seek(to time: CMTime) {
        audioPlayer.seek(to: time)
    }

    func seekToBeginning() {
        audioPlayer.seek(to: CMTimeMake(value: 0, timescale: 1))
    }

    func replay() {
        audioPlayer.seek(to: CMTimeMake(value: 0, timescale: 1))
        audioPlayer.play()
    }

    func pause() {
        if let audioPlayer = audioPlayer {
            audioPlayer.pause()
        }
    }

    func play() {
        audioPlayer.play()
    }

    func freshInstance() {
        audioPlayer = AVPlayer()
    }

    var assetDuration: CMTime {
        get {
            return audioPlayer.currentItem!.asset.duration
        }
    }
    }

1 个答案:

答案 0 :(得分:2)

您需要一种与OnGUI对象对话的机制,以便对其执行操作。
有很多解决方法。

我个人会为播放器创建一个专用的类,用于实例化它,加载音频资源,播放,暂停等。
然后,我将这个类设为单例,以便可以从任何地方访问它,或者将其注入并将其传递给将使用它的其他类。

基本示例:

player

从应用程序内的任何位置发送操作

class MyAudioPlayer {
    static let shared = MyAudioPlayer()

    private var player: AVAudioPlayer?

    func load(_ url: URL) {
        player = try? AVAudioPlayer(contentsOf: url)
    }

    func play(url: URL) {
        load(url: url)
        player?.play()
    }

    func pause() {
        player?.pause()
    }

    func stop() {
        player?.stop()
    }     
}

关于即使在应用未激活的情况下也要在后台播放(可能在MyAudioPlayer.shared.play(someURL) MyAudioPlayer.shared.pause() 中)

AppDelegate