从文件应用程序将mp3文件添加到iOS应用程序的内部存储

guard let mp3Path = Bundle.main.path(forResource: "your_mp3_file", ofType: "mp3") else {
    // 处理文件路径获取失败的情况
    return
}

let fileManager = FileManager.default
let documentsDirectory = fileManager.urls(for: .documentDirectory, in: .userDomainMask).first!

let destinationURL = documentsDirectory.appendingPathComponent("your_mp3_file.mp3")

do {
    try fileManager.copyItem(at: URL(fileURLWithPath: mp3Path), to: destinationURL)
} catch {
    // 处理文件复制失败的情况
}

let fileURL = documentsDirectory.appendingPathComponent("your_mp3_file.mp3")