“timedMetadata”已弃用。另一种方法？ <更新>

使用 PlayerItem.timedMetadata （粘贴在下面）已经有一段时间了，并且效果很好。然而，Apple 似乎已将此方法标记为“iOS 13 中已弃用”，并且可能（或将）被删除。

Xcode 确实告诉我，我必须使用另一种名为“AVPlayerItemMetadataOutput”的方法，但我从未尝试过。因此，在互联网（谷歌）上查找时，除了苹果文档之外，我什么也没发现（https://developer.apple.com/documentation/avfoundation/avplayeritemmetadataoutput https://developer.apple.com/documentation/avfoundation/avplayeritemmetadataoutput).

override open func observeValue(forKeyPath: String?, of: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
    guard forKeyPath == "timedMetadata" else { return }
    guard let meta = PlayerItem.timedMetadata else { return }
    for metadata in meta {
        if let songName = metadata.value(forKey: "value") as? String {
            Variables.MediaInfo = (songName)
            self.MediaBox.text = ("Now Playing \n \(songName)")
            setupNowPlaying()
        }
    }
}

UPDATE!

我已经在苹果文档中撞了一天左右的头了，然后它就像一块砖头打在我脸上。

class ViewController: UIViewController,AVPlayerItemMetadataOutputPushDelegate {

weak var myDelegate: AVPlayerItemMetadataOutputPushDelegate?
var playerItem: AVPlayerItem?
var player = AVPlayer()

override func viewDidLoad() {
    super.viewDidLoad()
    print("lets go!")
    let url = URL(string: "<URLREMOVED>")!
    let asset = AVAsset(url: url)
    let playerItem = AVPlayerItem(asset: asset)
    let metadataOutput = AVPlayerItemMetadataOutput(identifiers: nil)
    metadataOutput.setDelegate(self, queue: DispatchQueue.main)
    playerItem.add(metadataOutput)
    player = AVPlayer(playerItem: playerItem)
    player.play()
    print("END")
    print(playerItem.automaticallyLoadedAssetKeys.description)
}

func metadataOutput(_ output: AVPlayerItemMetadataOutput, didOutputTimedMetadataGroups groups: [AVTimedMetadataGroup], from track: AVPlayerItemTrack?) {

}


}

因此，这会读取定时元数据更改的流，然后显示以下输出：

AVMutableMetadataItem：0x600002064020，标识符= icy / StreamTitle，keySpace = icy，键类= __NSCFConstantString，key = StreamTitle，commonKey = title，extendLanguageTag =（null），dataType =（null），时间= {102328704/44100 = 2320.379}，持续时间={1/44100 = 0.000}，startDate=(null)，extras={\n}，值类别=__NSCFString，值=Tina Turner - Way Of The World>

整齐吧？所以现在我所要做的就是将 icy/StreamTitle 过滤到一个字符串中，我就很高兴了！ ：D

    func metadataOutput(_ output: AVPlayerItemMetadataOutput, didOutputTimedMetadataGroups groups: [AVTimedMetadataGroup], from track: AVPlayerItemTrack?) {
    if let item = groups.first?.items.first // make this an AVMetadata item
    {
        item.value(forKeyPath: "value") // looking for that key bro
        let Song = (item.value(forKeyPath: "value")!)
        MetaData = "Now Playing: \n \(Song)" // print the results
    } else {
        MetaData = "MetaData Error" // No Metadata or Could not read
    }