使用AVMutableMetadataItem

Question

我正在尝试使用AVMutableMetadataItem修改iTunes库中某些歌曲的信息，但是对此不走运。我仍在学习如何做，但找不到任何文档。

static func writeID3(_ audioFiles: URL)
{
    let audio = AVPlayerItem(url: audioFiles)
    let meta = audio.asset.metadata(forFormat: .iTunesMetadata)

    for eachMeta in meta
    {
        let av = AVMutableMetadataItem()
        av.keySpace = AVMetadataKeySpace.iTunes
        av.key = AVMetadataKey.iTunesMetadataKeyAlbumArtist as NSString
        av.value = "Various Artists" as NSString
    }
}