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我正在开发像 Netflix 这样的应用程序，当用户观看视频时，他可以锁定屏幕并查看带有视频内容的锁定屏幕控制器。

问题 1

当应用程序回到前台时，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中。

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。

据我了解，由于 MPRemoteCommandCenter 完成方法（playCommand、pauseCommand 等），播放器永远不会从内存中释放。

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，锁定屏幕甚至不显示。

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1 回答 1

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// 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)
于 2021-04-27T05:28:06.627 回答