Example of downloading a USDZ file from a remote URL synchronously

Download+Remote+USDZ.swift

func downloadUSDZ(from url: String, to destination: URL) -> URL? {
  guard let remoteURL = URL(string: url) else {
    return nil
  }
  var semaphore = DispatchSemaphore(value: 0)
  var request = URLRequest(url: remoteURL, timeoutInterval: 10)
  request.httpMethod = "GET"
  var downloadLocation: URL?
  let task = URLSession.shared.downloadTask(
    with: request
  ) { location, response, error in 
    defer { semaphore.signal() }
    guard error == nil else {
      return
    }
    let destinationUrl = destination.appendingPathComponent(remoteURL.lastPathComponent)
    if FileManager.default.fileExists(atPath: destinationUrl.path) {
      try! FileManager.default.removeItem(atPath: destinationUrl.path)
    }
    try! FileManager.default.moveItem(atPath: location!.path, toPath: destinationUrl.path)
    downloadLocation = destinationUrl
  }

  task.resume()
  semaphore.wait()
  return downloadLocation
}

guard let downloadLocation = downloadUSDZ(
  from: "https://developer.apple.com/augmented-reality/quick-look/models/stratocaster/fender_stratocaster.usdz",
  to: docsURL
) else {
  fatalError("could not download usdz")
}

let guitarEntity = try? Entity.load(contentsOf: downloadLocation)