使用 swift 3 在后台播放视频的问题

Question

我有一个应用程序，从互联网下载视频并通过我的应用程序播放我需要在用户退出应用程序时在后台播放视频它仍然工作我如何执行此任务我尝试一些关于站点堆栈溢出的问题但无法解决我的问题，我添加了以下代码来制作它并且也无法正常工作

 override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        UIApplication.shared.beginReceivingRemoteControlEvents()
        self.becomeFirstResponder()
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)

        UIApplication.shared.endReceivingRemoteControlEvents()
        self.resignFirstResponder()
    }

    override func remoteControlReceived(with event: UIEvent?) {
        if event?.subtype == UIEventSubtype.remoteControlPlay {
            print("Play")
        }
    }

我还在 Appdelegate 中添加以下代码

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.

    let getAvAudioSession = AVAudioSession.sharedInstance()
    do {
          try getAvAudioSession.setActive(true)
          try getAvAudioSession.setCategory(AVAudioSessionCategoryPlayback)
    }catch{
        print(error)
    }
    return true
}

而且我还在应用程序中启用后台模式，但功能也不起作用

请帮我修一下

非常感谢

Answer 1

考虑导入 MediaPlayer。像下面的东西。

import MediaPlayer

let mpic = MPRemoteCommandCenter.shared()

func setupNowPlayingInfoCenter() {
    UIApplication.shared.beginReceivingRemoteControlEvents()
    mpic.playCommand.addTarget {event in
        print("playCommand")
        self.player?.play()
        return .success
    }
    mpic.pauseCommand.addTarget {event in
        print("pauseCommand")
        if self.player?.rate != 0 {
            self.player?.pause()
        }
        return .success
    }
    mpic.nextTrackCommand.addTarget {event in
        print("nextTrackCommand")
        return .success
    }
    mpic.previousTrackCommand.addTarget {event in
        print("previousTrackCommand")
        return .success
    }

}

不知道您是否真的想在 Appdelegate 中开始您的音频会话，但这取决于您。基本上在开始播放时调用 setupNowPlayingInfoCenter()。