swift - 映射 Documents 目录下的 mp3 并转换为 AVPlayerItems

Question

我正在使用此方法将主包路径中的 mp3 转换为 avplayer 项目:

let path = Bundle.main.path(forResource: "Baroon", ofType: "mp3")
let url = URL(fileURLWithPath: path!)
let asset = AVAsset(url: url)
let item = AVPlayerItem(asset: asset)

如何自动转换 Documents 目录中存在的每个 mp3？

Answer 1

您可以使用 FileManager 的 contentsOfDirectory(of: URL) 方法获取文档目录中的所有文件并映射包含 mp3 路径扩展的文件:

let documents = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
do {
    let playesItems = try FileManager.default.contentsOfDirectory(at: documents, includingPropertiesForKeys: nil).compactMap {
        $0.pathExtension == "mp3" ? $0.asset.playerItem : nil
    }
    for item in playesItems {
        print(item.asset.duration)
    }
} catch { print(error) }

---

不要忘记将这些助手添加到您的项目中:

import UIKit
import AVKit

extension URL {
    var asset: AVAsset {
        return AVAsset(url: self)
    }
}
extension AVAsset {
    var playerItem: AVPlayerItem {
        return AVPlayerItem(asset: self)
    }
}