完成播放视频后，锁屏小部件不会消失

问题描述

我正在开发一个像 Netflix 这样的应用程序，当用户观看视频时，他可以锁定屏幕并看到带有视频内容的锁屏控制器。

问题 1

当应用返回前台时，用户退出播放器，再次锁定屏幕，但播放器控制器仍处于锁定屏幕。

问题 2

用户观看视频后，退出播放器并进入另一个视频，当他锁定屏幕时，播放器锁屏控制器播放2个视频，当前一个和之前的一个。

据我所知，由于 MPRemoteCommandCenter 完成方法（playCommand、pauseCommand 等），播放器从未从内存中解除分配。

我的自定义播放器类设置锁屏控制器：

private var NowPlayingInfo : [String:Any] = [:]

//MARK: UPDATING LOCKSCREEN STATUS
func updateLockscreenInfo(playPosition: Double? = nil) {
    NowPlayingInfo[MPMediaItemPropertyPlaybackDuration] = currentItem?.duration.seconds ?? 0
    NowPlayingInfo[MPNowPlayingInfoPropertyElapsedplaybackTime] = playPosition ?? currentTime().seconds
    NowPlayingInfo[MPNowPlayingInfoPropertyPlaybackRate] = rate
    MPNowPlayingInfoCenter.default().NowPlayingInfo = NowPlayingInfo
}

//MARK: LOCKSCREEN PLAYER DELEGATES
private func setupLockScreen() {
    let commandCenter = MPRemoteCommandCenter.shared()

    commandCenter.playCommand.addTarget { [weak self] event -> MPRemoteCommandHandlerStatus in
        print(self)
        //after playing 2 videos,prints twixe 2 different instances
        self?.play()
        self?.updateLockscreenInfo()
        return .success
    }
}
//MARK: LOCK SCREEN INITIAL SETTER ( IMAGE & TITLE )
private func setControllerLockScreen(imageURL: String?,title: String?) {
    
    NowPlayingInfo[MPMediaItemPropertyTitle] = title
    
    if let imageURL = imageURL,let url = URL(string: imageURL) {
        var data : Data?
        do {
            data = try Data(contentsOf: url)
            if let data = data,let image = UIImage(data: data) {
                NowPlayingInfo[MPMediaItemPropertyArtwork] = MPMediaItemArtwork(boundsSize: image.size,requestHandler: { (size) -> UIImage in
                    return image
                })
            }
        }
        catch {
            po(name: "error downloading image: ",data: error.localizedDescription)
        }
    }
    
    MPNowPlayingInfoCenter.default().NowPlayingInfo = NowPlayingInfo
}

当我删除“commandCenter.playCommand.addTarget”时，锁屏甚至不显示。

解决方法

// store handler
var handler: Any?

handler = commandCenter.playCommand.addTarget { [weak self] event -> MPRemoteCommandHandlerStatus in
    return .success
}

// remove handler when you close the video
handler.map(commandCenter.playCommand.removeTarget)